From cb10d13483bddb185db638bc6f1ac1f424bb2b54 Mon Sep 17 00:00:00 2001
From: gpestana <g6pestana@gmail.com>
Date: Wed, 14 Dec 2022 10:34:08 +0100
Subject: [PATCH 01/22] EPM and staking pallets: Adds new crate for integration
 tests

a
---
 .../test-election-provider/Cargo.lock         | 3506 +++++++++++++++++
 .../test-election-provider/Cargo.toml         |   39 +
 .../test-election-provider/src/lib.rs         |   25 +
 .../test-election-provider/src/mock.rs        |  324 ++
 4 files changed, 3894 insertions(+)
 create mode 100644 frame/election-provider-multi-phase/test-election-provider/Cargo.lock
 create mode 100644 frame/election-provider-multi-phase/test-election-provider/Cargo.toml
 create mode 100644 frame/election-provider-multi-phase/test-election-provider/src/lib.rs
 create mode 100644 frame/election-provider-multi-phase/test-election-provider/src/mock.rs

diff --git a/frame/election-provider-multi-phase/test-election-provider/Cargo.lock b/frame/election-provider-multi-phase/test-election-provider/Cargo.lock
new file mode 100644
index 0000000000000..f55bb48fdc9ac
--- /dev/null
+++ b/frame/election-provider-multi-phase/test-election-provider/Cargo.lock
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diff --git a/frame/election-provider-multi-phase/test-election-provider/Cargo.toml b/frame/election-provider-multi-phase/test-election-provider/Cargo.toml
new file mode 100644
index 0000000000000..e75d48e797e4e
--- /dev/null
+++ b/frame/election-provider-multi-phase/test-election-provider/Cargo.toml
@@ -0,0 +1,39 @@
+[package]
+name = "pallet-election-provider-test"
+version = "1.0.0"
+authors = ["Parity Technologies <admin@parity.io>"]
+edition = "2021"
+license = "Apache-2.0"
+homepage = "https://substrate.io"
+repository = "https://github.com/paritytech/substrate/"
+description = "FRAME election provider multi phase pallet tests with staking pallet, bags-list and session pallets"
+publish = false
+
+[package.metadata.docs.rs]
+targets = ["x86_64-unknown-linux-gnu"]
+
+[workspace]
+
+[dev-dependencies]
+codec = { package = "parity-scale-codec", version = "3.0.0", features = ["derive"] }
+scale-info = { version = "2.0.1", features = ["derive"] }
+log = { version = "0.4.17", default-features = false }
+
+sp-runtime = { version = "7.0.0", path = "../../../primitives/runtime" }
+sp-io = { version = "7.0.0", path = "../../../primitives/io" }
+sp-std = { version = "5.0.0", path = "../../../primitives/std" }
+sp-staking = { version = "4.0.0-dev", path = "../../../primitives/staking" }
+sp-core = { version = "7.0.0", path = "../../../primitives/core" }
+sp-npos-elections = { version = "4.0.0-dev", default-features = false, path = "../../../primitives/npos-elections" }
+
+frame-system = { version = "4.0.0-dev", path = "../../system" }
+frame-support = { version = "4.0.0-dev", path = "../../support" }
+frame-election-provider-support = { version = "4.0.0-dev", path = "../../election-provider-support" }
+
+pallet-election-provider-multi-phase = { version = "4.0.0-dev", path = "../../election-provider-multi-phase" }
+pallet-staking = { version = "4.0.0-dev", path = "../../staking" }
+pallet-bags-list = { version = "4.0.0-dev", path = "../../bags-list" }
+pallet-balances = { version = "4.0.0-dev", path = "../../balances" }
+pallet-timestamp = { version = "4.0.0-dev", path = "../../timestamp" }
+pallet-session = { version = "4.0.0-dev", path = "../../session" }
+
diff --git a/frame/election-provider-multi-phase/test-election-provider/src/lib.rs b/frame/election-provider-multi-phase/test-election-provider/src/lib.rs
new file mode 100644
index 0000000000000..d4bd9aeadb575
--- /dev/null
+++ b/frame/election-provider-multi-phase/test-election-provider/src/lib.rs
@@ -0,0 +1,25 @@
+// This file is part of Substrate.
+
+// Copyright (C) 2022 Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: Apache-2.0
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#![cfg(test)]
+
+mod mock;
+
+#[test]
+fn test_one() {
+	assert!(true);
+}
diff --git a/frame/election-provider-multi-phase/test-election-provider/src/mock.rs b/frame/election-provider-multi-phase/test-election-provider/src/mock.rs
new file mode 100644
index 0000000000000..00a9995279058
--- /dev/null
+++ b/frame/election-provider-multi-phase/test-election-provider/src/mock.rs
@@ -0,0 +1,324 @@
+// This file is part of Substrate.
+
+// Copyright (C) 2022 Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: Apache-2.0
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use frame_support::{parameter_types, traits};
+use frame_system::EnsureRoot;
+use sp_core::{ConstU32, H256};
+use sp_npos_elections::{BalancingConfig, VoteWeight};
+use sp_runtime::{testing, traits::IdentityLookup, transaction_validity, PerU16, Perbill};
+use sp_std::prelude::*;
+
+use frame_election_provider_support::{onchain, SequentialPhragmen, Weight};
+use pallet_election_provider_multi_phase::{unsigned::MinerConfig, SolutionAccuracyOf};
+
+// Duration in number of blocks for each of the EPM phases.
+const EPM_PHASE_DURATION: u32 = 10;
+
+pub(crate) type AccountId = u128;
+pub(crate) type AccountIndex = u32;
+pub(crate) type BlockNumber = u64;
+pub(crate) type Balance = u128;
+pub(crate) type VoterIndex = u32;
+pub(crate) type TargetIndex = u16;
+
+impl frame_system::Config for Runtime {
+	type BaseCallFilter = traits::Everything;
+	type BlockWeights = ();
+	type BlockLength = ();
+	type DbWeight = ();
+	type RuntimeOrigin = RuntimeOrigin;
+	type Index = AccountIndex;
+	type BlockNumber = BlockNumber;
+	type RuntimeCall = RuntimeCall;
+	type Hash = H256;
+	type Hashing = sp_runtime::traits::BlakeTwo256;
+	type AccountId = AccountId;
+	type Lookup = IdentityLookup<Self::AccountId>;
+	type Header = sp_runtime::testing::Header;
+	type RuntimeEvent = RuntimeEvent;
+	type BlockHashCount = ();
+	type Version = ();
+	type PalletInfo = PalletInfo;
+	type AccountData = pallet_balances::AccountData<Balance>;
+	type OnNewAccount = ();
+	type OnKilledAccount = ();
+	type SystemWeightInfo = ();
+	type SS58Prefix = ();
+	type OnSetCode = ();
+	type MaxConsumers = traits::ConstU32<16>;
+}
+
+parameter_types! {
+	pub static ExistentialDeposit: Balance = 1;
+}
+
+impl pallet_balances::Config for Runtime {
+	type MaxLocks = traits::ConstU32<1024>;
+	type MaxReserves = ();
+	type ReserveIdentifier = [u8; 8];
+	type Balance = Balance;
+	type RuntimeEvent = RuntimeEvent;
+	type DustRemoval = ();
+	type ExistentialDeposit = ExistentialDeposit;
+	type AccountStore = System;
+	type WeightInfo = ();
+}
+
+impl pallet_timestamp::Config for Runtime {
+	type Moment = u64;
+	type OnTimestampSet = ();
+	type MinimumPeriod = traits::ConstU64<5>;
+	type WeightInfo = ();
+}
+
+parameter_types! {
+	pub static Period: BlockNumber = 5;
+	pub static Offset: BlockNumber = 0;
+}
+
+sp_runtime::impl_opaque_keys! {
+	pub struct SessionKeys {
+		pub other: OtherSessionHandler,
+	}
+}
+
+impl pallet_session::Config for Runtime {
+	type SessionManager = pallet_session::historical::NoteHistoricalRoot<Runtime, Staking>;
+	type Keys = SessionKeys;
+	type ShouldEndSession = pallet_session::PeriodicSessions<Period, Offset>;
+	type SessionHandler = (OtherSessionHandler,);
+	type RuntimeEvent = RuntimeEvent;
+	type ValidatorId = AccountId;
+	type ValidatorIdOf = pallet_staking::StashOf<Runtime>;
+	type NextSessionRotation = pallet_session::PeriodicSessions<Period, Offset>;
+	type WeightInfo = ();
+}
+impl pallet_session::historical::Config for Runtime {
+	type FullIdentification = pallet_staking::Exposure<AccountId, Balance>;
+	type FullIdentificationOf = pallet_staking::ExposureOf<Runtime>;
+}
+
+frame_election_provider_support::generate_solution_type!(
+	#[compact]
+	pub struct MockNposSolution::<
+		VoterIndex = VoterIndex,
+		TargetIndex = TargetIndex,
+		Accuracy = PerU16,
+		MaxVoters = ConstU32::<2_000>
+	>(16)
+);
+
+parameter_types! {
+	pub SignedPhase: u32 = EPM_PHASE_DURATION;
+	pub UnsignedPhase: u32 = EPM_PHASE_DURATION;
+	pub BetterSignedThreshold: Perbill = Perbill::zero();
+	pub BetterUnsignedThreshold: Perbill = Perbill::zero();
+	pub OffchainRepeat: u32 = 5;
+	pub TransactionPriority: transaction_validity::TransactionPriority = 1;
+	pub MaxWinners: u32 = 100;
+	pub MaxVotesPerVoter: u32 = 16;
+	pub MaxNominations: u32 = 16;
+
+	pub static MaxElectingVoters: VoterIndex = 1000;
+	pub static MaxElectableTargets: TargetIndex = 1000;
+	pub static MaxActiveValidators: u32 = 1000;
+	pub static Balancing: Option<BalancingConfig> = Some( BalancingConfig { iterations: 0, tolerance: 0 } );
+}
+
+impl pallet_election_provider_multi_phase::Config for Runtime {
+	type RuntimeEvent = RuntimeEvent;
+	type Currency = ();
+	type EstimateCallFee = frame_support::traits::ConstU32<8>;
+	type SignedPhase = SignedPhase;
+	type UnsignedPhase = UnsignedPhase;
+	type BetterSignedThreshold = BetterSignedThreshold;
+	type BetterUnsignedThreshold = BetterUnsignedThreshold;
+	type OffchainRepeat = OffchainRepeat;
+	type MinerTxPriority = TransactionPriority;
+	type MinerConfig = Self;
+	type SignedMaxSubmissions = ConstU32<10>;
+	type SignedRewardBase = ();
+	type SignedDepositBase = ();
+	type SignedDepositByte = ();
+	type SignedMaxRefunds = ConstU32<3>;
+	type SignedDepositWeight = ();
+	type SignedMaxWeight = ();
+	type SlashHandler = ();
+	type RewardHandler = ();
+	type DataProvider = Staking;
+	type Fallback = onchain::OnChainExecution<OnChainSeqPhragmen>;
+	type GovernanceFallback = onchain::OnChainExecution<OnChainSeqPhragmen>;
+	type Solver = SequentialPhragmen<AccountId, SolutionAccuracyOf<Runtime>, Balancing>;
+	type ForceOrigin = EnsureRoot<AccountId>;
+	type MaxElectableTargets = MaxElectableTargets;
+	type MaxElectingVoters = MaxElectingVoters;
+	type MaxWinners = MaxWinners;
+	type BenchmarkingConfig = ElectionProviderBenchmarkConfig;
+	type WeightInfo = ();
+}
+
+impl MinerConfig for Runtime {
+	type AccountId = AccountId;
+	type Solution = MockNposSolution;
+	type MaxVotesPerVoter = MaxNominations;
+	type MaxLength = ();
+	type MaxWeight = ();
+
+	fn solution_weight(_voters: u32, _targets: u32, _active_voters: u32, _degree: u32) -> Weight {
+		Weight::zero()
+	}
+}
+
+const THRESHOLDS: [VoteWeight; 9] = [10, 20, 30, 40, 50, 60, 1_000, 2_000, 10_000];
+
+parameter_types! {
+	pub static BagThresholds: &'static [sp_npos_elections::VoteWeight] = &THRESHOLDS;
+	pub const SessionsPerEra: sp_staking::SessionIndex = 6;
+	pub const BondingDuration: sp_staking::EraIndex = 24 * 28;
+	pub const SlashDeferDuration: sp_staking::EraIndex = 24 * 7; // 1/4 the bonding duration.
+	pub const MaxNominatorRewardedPerValidator: u32 = 256;
+	pub const OffendingValidatorsThreshold: Perbill = Perbill::from_percent(17);
+	pub HistoryDepth: u32 = 84;
+}
+
+impl pallet_bags_list::Config for Runtime {
+	type RuntimeEvent = RuntimeEvent;
+	type WeightInfo = ();
+	type ScoreProvider = Staking;
+	type BagThresholds = BagThresholds;
+	type Score = VoteWeight;
+}
+
+impl pallet_staking::Config for Runtime {
+	type MaxNominations = MaxNominations;
+	type Currency = Balances;
+	type CurrencyBalance = Balance;
+	type UnixTime = pallet_timestamp::Pallet<Self>;
+	type CurrencyToVote = traits::U128CurrencyToVote;
+	type RewardRemainder = ();
+	type RuntimeEvent = RuntimeEvent;
+	type Slash = (); // burn slashes
+	type Reward = (); // rewards are minted from the void
+	type SessionsPerEra = SessionsPerEra;
+	type BondingDuration = BondingDuration;
+	type SlashDeferDuration = SlashDeferDuration;
+	type SlashCancelOrigin = EnsureRoot<AccountId>; // root can cancel slashes
+	type SessionInterface = Self;
+	type EraPayout = ();
+	type NextNewSession = Session;
+	type MaxNominatorRewardedPerValidator = MaxNominatorRewardedPerValidator;
+	type OffendingValidatorsThreshold = OffendingValidatorsThreshold;
+	type ElectionProvider = ElectionProviderMultiPhase;
+	type GenesisElectionProvider = onchain::OnChainExecution<OnChainSeqPhragmen>;
+	type VoterList = BagsList;
+	type TargetList = pallet_staking::UseValidatorsMap<Self>;
+	type MaxUnlockingChunks = ConstU32<32>;
+	type HistoryDepth = HistoryDepth;
+	type OnStakerSlash = ();
+	type WeightInfo = pallet_staking::weights::SubstrateWeight<Runtime>;
+	type BenchmarkingConfig = StakingBenchmarkingConfig;
+}
+
+impl<LocalCall> frame_system::offchain::SendTransactionTypes<LocalCall> for Runtime
+where
+	RuntimeCall: From<LocalCall>,
+{
+	type OverarchingCall = RuntimeCall;
+	type Extrinsic = Extrinsic;
+}
+
+type Block = frame_system::mocking::MockBlock<Runtime>;
+type UncheckedExtrinsic = frame_system::mocking::MockUncheckedExtrinsic<Runtime>;
+type Extrinsic = testing::TestXt<RuntimeCall, ()>;
+
+frame_support::construct_runtime!(
+	pub enum Runtime where
+		Block = Block,
+		NodeBlock = Block,
+		UncheckedExtrinsic = UncheckedExtrinsic
+	{
+		System: frame_system::{Pallet, Call, Event<T>},
+		ElectionProviderMultiPhase: pallet_election_provider_multi_phase,
+		Staking: pallet_staking,
+		Balances: pallet_balances,
+		BagsList: pallet_bags_list,
+		Session: pallet_session,
+	}
+);
+
+pub struct OnChainSeqPhragmen;
+
+parameter_types! {
+	pub VotersBound: u32 = 600;
+	pub TargetsBound: u32 = 400;
+}
+
+impl onchain::Config for OnChainSeqPhragmen {
+	type System = Runtime;
+	type Solver = SequentialPhragmen<
+		AccountId,
+		pallet_election_provider_multi_phase::SolutionAccuracyOf<Runtime>,
+	>;
+	type DataProvider = Staking; //StakingTemporary;
+	type WeightInfo = ();
+	type MaxWinners = MaxWinners;
+	type VotersBound = VotersBound;
+	type TargetsBound = TargetsBound;
+}
+
+pub struct StakingBenchmarkingConfig;
+impl pallet_staking::BenchmarkingConfig for StakingBenchmarkingConfig {
+	type MaxNominators = traits::ConstU32<1000>;
+	type MaxValidators = traits::ConstU32<1000>;
+}
+
+pub struct ElectionProviderBenchmarkConfig;
+
+impl pallet_election_provider_multi_phase::BenchmarkingConfig for ElectionProviderBenchmarkConfig {
+	const VOTERS: [u32; 2] = [1000, 2000];
+	const TARGETS: [u32; 2] = [500, 1000];
+	const ACTIVE_VOTERS: [u32; 2] = [500, 800];
+	const DESIRED_TARGETS: [u32; 2] = [200, 400];
+	const SNAPSHOT_MAXIMUM_VOTERS: u32 = 1000;
+	const MINER_MAXIMUM_VOTERS: u32 = 1000;
+	const MAXIMUM_TARGETS: u32 = 300;
+}
+
+pub struct OtherSessionHandler;
+impl traits::OneSessionHandler<AccountId> for OtherSessionHandler {
+	type Key = testing::UintAuthorityId;
+
+	fn on_genesis_session<'a, I: 'a>(_: I)
+	where
+		I: Iterator<Item = (&'a AccountId, Self::Key)>,
+		AccountId: 'a,
+	{
+	}
+
+	fn on_new_session<'a, I: 'a>(_: bool, _: I, _: I)
+	where
+		I: Iterator<Item = (&'a AccountId, Self::Key)>,
+		AccountId: 'a,
+	{
+	}
+
+	fn on_disabled(_validator_index: u32) {}
+}
+
+impl sp_runtime::BoundToRuntimeAppPublic for OtherSessionHandler {
+	type Public = testing::UintAuthorityId;
+}

From 3ec154105d64447d6c4e08e6fab0b11ca991085a Mon Sep 17 00:00:00 2001
From: gpestana <g6pestana@gmail.com>
Date: Fri, 16 Dec 2022 12:51:14 +0100
Subject: [PATCH 02/22] Adds ExtBuilder and helpers with initial conditions
 assertions

---
 .../test-election-provider/Cargo.lock         |   1 +
 .../test-election-provider/Cargo.toml         |   1 +
 .../test-election-provider/src/lib.rs         |  32 ++-
 .../test-election-provider/src/mock.rs        | 256 +++++++++++++++---
 4 files changed, 244 insertions(+), 46 deletions(-)

diff --git a/frame/election-provider-multi-phase/test-election-provider/Cargo.lock b/frame/election-provider-multi-phase/test-election-provider/Cargo.lock
index f55bb48fdc9ac..15d6f29c68e97 100644
--- a/frame/election-provider-multi-phase/test-election-provider/Cargo.lock
+++ b/frame/election-provider-multi-phase/test-election-provider/Cargo.lock
@@ -1644,6 +1644,7 @@ dependencies = [
  "sp-runtime",
  "sp-staking",
  "sp-std",
+ "sp-tracing",
 ]
 
 [[package]]
diff --git a/frame/election-provider-multi-phase/test-election-provider/Cargo.toml b/frame/election-provider-multi-phase/test-election-provider/Cargo.toml
index e75d48e797e4e..477eae5d57413 100644
--- a/frame/election-provider-multi-phase/test-election-provider/Cargo.toml
+++ b/frame/election-provider-multi-phase/test-election-provider/Cargo.toml
@@ -25,6 +25,7 @@ sp-std = { version = "5.0.0", path = "../../../primitives/std" }
 sp-staking = { version = "4.0.0-dev", path = "../../../primitives/staking" }
 sp-core = { version = "7.0.0", path = "../../../primitives/core" }
 sp-npos-elections = { version = "4.0.0-dev", default-features = false, path = "../../../primitives/npos-elections" }
+sp-tracing = { version = "6.0.0", path = "../../../primitives/tracing" }
 
 frame-system = { version = "4.0.0-dev", path = "../../system" }
 frame-support = { version = "4.0.0-dev", path = "../../support" }
diff --git a/frame/election-provider-multi-phase/test-election-provider/src/lib.rs b/frame/election-provider-multi-phase/test-election-provider/src/lib.rs
index d4bd9aeadb575..1804eb5b79a26 100644
--- a/frame/election-provider-multi-phase/test-election-provider/src/lib.rs
+++ b/frame/election-provider-multi-phase/test-election-provider/src/lib.rs
@@ -16,10 +16,36 @@
 // limitations under the License.
 
 #![cfg(test)]
-
 mod mock;
 
+use frame_support::bounded_vec;
+use mock::{agents::*, *};
+
 #[test]
-fn test_one() {
-	assert!(true);
+fn test_extbuilder_and_helpers() {
+	ExtBuilder.phases(5, 5).build_and_execute(|| {
+		assert_eq!(Balances::free_balance(ACCOUNT_1), 100);
+
+		assert_eq!(System::block_number(), 0);
+		assert!(ElectionProviderMultiPhase::current_phase().is_off());
+
+		roll_to_signed();
+		assert!(ElectionProviderMultiPhase::current_phase().is_signed());
+		assert_eq!(System::block_number(), 5);
+
+		roll_to_unsigned();
+		assert!(ElectionProviderMultiPhase::current_phase().is_unsigned());
+		assert_eq!(System::block_number(), 10);
+	});
+
+	ExtBuilder
+		.add_voter(ACCOUNT_0, 100, bounded_vec![ACCOUNT_0, ACCOUNT_1])
+		.build_and_execute(|| {
+			// TODO: add staking genesis init in extbuilder
+
+			roll_to_unsigned();
+			let _snapshot = ElectionProviderMultiPhase::snapshot();
+
+			// TODO: check snapshot
+		});
 }
diff --git a/frame/election-provider-multi-phase/test-election-provider/src/mock.rs b/frame/election-provider-multi-phase/test-election-provider/src/mock.rs
index 00a9995279058..44e0eb1c0e203 100644
--- a/frame/election-provider-multi-phase/test-election-provider/src/mock.rs
+++ b/frame/election-provider-multi-phase/test-election-provider/src/mock.rs
@@ -15,7 +15,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-use frame_support::{parameter_types, traits};
+use frame_support::{bounded_vec, parameter_types, traits, traits::Hooks, BoundedVec};
 use frame_system::EnsureRoot;
 use sp_core::{ConstU32, H256};
 use sp_npos_elections::{BalancingConfig, VoteWeight};
@@ -23,17 +23,37 @@ use sp_runtime::{testing, traits::IdentityLookup, transaction_validity, PerU16,
 use sp_std::prelude::*;
 
 use frame_election_provider_support::{onchain, SequentialPhragmen, Weight};
-use pallet_election_provider_multi_phase::{unsigned::MinerConfig, SolutionAccuracyOf};
+use pallet_election_provider_multi_phase::{
+	unsigned::{MinerConfig, VoterOf},
+	SolutionAccuracyOf,
+};
 
-// Duration in number of blocks for each of the EPM phases.
-const EPM_PHASE_DURATION: u32 = 10;
+type Block = frame_system::mocking::MockBlock<Runtime>;
+type UncheckedExtrinsic = frame_system::mocking::MockUncheckedExtrinsic<Runtime>;
+type Extrinsic = testing::TestXt<RuntimeCall, ()>;
+
+frame_support::construct_runtime!(
+	pub enum Runtime where
+		Block = Block,
+		NodeBlock = Block,
+		UncheckedExtrinsic = UncheckedExtrinsic
+	{
+		System: frame_system,
+		ElectionProviderMultiPhase: pallet_election_provider_multi_phase,
+		Staking: pallet_staking,
+		Balances: pallet_balances,
+		BagsList: pallet_bags_list,
+		Session: pallet_session,
+	}
+);
 
 pub(crate) type AccountId = u128;
 pub(crate) type AccountIndex = u32;
 pub(crate) type BlockNumber = u64;
-pub(crate) type Balance = u128;
+pub(crate) type Balance = u64;
 pub(crate) type VoterIndex = u32;
 pub(crate) type TargetIndex = u16;
+pub(crate) type Moment = u64;
 
 impl frame_system::Config for Runtime {
 	type BaseCallFilter = traits::Everything;
@@ -78,15 +98,27 @@ impl pallet_balances::Config for Runtime {
 	type WeightInfo = ();
 }
 
+parameter_types! {
+	pub static CapturedMoment: Option<Moment> = None;
+}
+
+// TOOD(gpestana) needed or can we set Timestamp::OnTimestampSet = ()?
+pub struct MockOnTimestampSet;
+impl traits::OnTimestampSet<Moment> for MockOnTimestampSet {
+	fn on_timestamp_set(moment: Moment) {
+		CapturedMoment::mutate(|x| *x = Some(moment));
+	}
+}
+
 impl pallet_timestamp::Config for Runtime {
-	type Moment = u64;
-	type OnTimestampSet = ();
+	type Moment = Moment;
+	type OnTimestampSet = MockOnTimestampSet;
 	type MinimumPeriod = traits::ConstU64<5>;
 	type WeightInfo = ();
 }
 
 parameter_types! {
-	pub static Period: BlockNumber = 5;
+	pub static Period: BlockNumber = 15;
 	pub static Offset: BlockNumber = 0;
 }
 
@@ -123,25 +155,24 @@ frame_election_provider_support::generate_solution_type!(
 );
 
 parameter_types! {
-	pub SignedPhase: u32 = EPM_PHASE_DURATION;
-	pub UnsignedPhase: u32 = EPM_PHASE_DURATION;
-	pub BetterSignedThreshold: Perbill = Perbill::zero();
-	pub BetterUnsignedThreshold: Perbill = Perbill::zero();
-	pub OffchainRepeat: u32 = 5;
-	pub TransactionPriority: transaction_validity::TransactionPriority = 1;
-	pub MaxWinners: u32 = 100;
-	pub MaxVotesPerVoter: u32 = 16;
-	pub MaxNominations: u32 = 16;
-
+	pub static SignedPhase: BlockNumber = 10;
+	pub static UnsignedPhase: BlockNumber = 5;
 	pub static MaxElectingVoters: VoterIndex = 1000;
 	pub static MaxElectableTargets: TargetIndex = 1000;
 	pub static MaxActiveValidators: u32 = 1000;
 	pub static Balancing: Option<BalancingConfig> = Some( BalancingConfig { iterations: 0, tolerance: 0 } );
+	pub static BetterSignedThreshold: Perbill = Perbill::zero();
+	pub static BetterUnsignedThreshold: Perbill = Perbill::zero();
+	pub static OffchainRepeat: u32 = 5;
+	pub static TransactionPriority: transaction_validity::TransactionPriority = 1;
+	pub static MaxWinners: u32 = 100;
+	pub static MaxVotesPerVoter: u32 = 16;
+	pub static MaxNominations: u32 = 16;
 }
 
 impl pallet_election_provider_multi_phase::Config for Runtime {
 	type RuntimeEvent = RuntimeEvent;
-	type Currency = ();
+	type Currency = Balances;
 	type EstimateCallFee = frame_support::traits::ConstU32<8>;
 	type SignedPhase = SignedPhase;
 	type UnsignedPhase = UnsignedPhase;
@@ -187,9 +218,9 @@ const THRESHOLDS: [VoteWeight; 9] = [10, 20, 30, 40, 50, 60, 1_000, 2_000, 10_00
 
 parameter_types! {
 	pub static BagThresholds: &'static [sp_npos_elections::VoteWeight] = &THRESHOLDS;
-	pub const SessionsPerEra: sp_staking::SessionIndex = 6;
-	pub const BondingDuration: sp_staking::EraIndex = 24 * 28;
-	pub const SlashDeferDuration: sp_staking::EraIndex = 24 * 7; // 1/4 the bonding duration.
+	pub const SessionsPerEra: sp_staking::SessionIndex = 1;
+	pub const BondingDuration: sp_staking::EraIndex = 28;
+	pub const SlashDeferDuration: sp_staking::EraIndex = 7; // 1/4 the bonding duration.
 	pub const MaxNominatorRewardedPerValidator: u32 = 256;
 	pub const OffendingValidatorsThreshold: Perbill = Perbill::from_percent(17);
 	pub HistoryDepth: u32 = 84;
@@ -208,7 +239,7 @@ impl pallet_staking::Config for Runtime {
 	type Currency = Balances;
 	type CurrencyBalance = Balance;
 	type UnixTime = pallet_timestamp::Pallet<Self>;
-	type CurrencyToVote = traits::U128CurrencyToVote;
+	type CurrencyToVote = traits::SaturatingCurrencyToVote;
 	type RewardRemainder = ();
 	type RuntimeEvent = RuntimeEvent;
 	type Slash = (); // burn slashes
@@ -241,25 +272,6 @@ where
 	type Extrinsic = Extrinsic;
 }
 
-type Block = frame_system::mocking::MockBlock<Runtime>;
-type UncheckedExtrinsic = frame_system::mocking::MockUncheckedExtrinsic<Runtime>;
-type Extrinsic = testing::TestXt<RuntimeCall, ()>;
-
-frame_support::construct_runtime!(
-	pub enum Runtime where
-		Block = Block,
-		NodeBlock = Block,
-		UncheckedExtrinsic = UncheckedExtrinsic
-	{
-		System: frame_system::{Pallet, Call, Event<T>},
-		ElectionProviderMultiPhase: pallet_election_provider_multi_phase,
-		Staking: pallet_staking,
-		Balances: pallet_balances,
-		BagsList: pallet_bags_list,
-		Session: pallet_session,
-	}
-);
-
 pub struct OnChainSeqPhragmen;
 
 parameter_types! {
@@ -273,7 +285,7 @@ impl onchain::Config for OnChainSeqPhragmen {
 		AccountId,
 		pallet_election_provider_multi_phase::SolutionAccuracyOf<Runtime>,
 	>;
-	type DataProvider = Staking; //StakingTemporary;
+	type DataProvider = Staking;
 	type WeightInfo = ();
 	type MaxWinners = MaxWinners;
 	type VotersBound = VotersBound;
@@ -322,3 +334,161 @@ impl traits::OneSessionHandler<AccountId> for OtherSessionHandler {
 impl sp_runtime::BoundToRuntimeAppPublic for OtherSessionHandler {
 	type Public = testing::UintAuthorityId;
 }
+
+#[derive(Default)]
+pub struct ExtBuilder;
+
+pub mod agents {
+	use super::AccountId;
+
+	pub const ACCOUNT_0: AccountId = 0;
+	pub const ACCOUNT_1: AccountId = 1;
+	pub const ACCOUNT_2: AccountId = 2;
+	pub const ACCOUNT_3: AccountId = 3;
+	pub const ACCOUNT_4: AccountId = 4;
+	pub const ACCOUNT_5: AccountId = 5;
+	pub const ACCOUNT_6: AccountId = 6;
+	pub const ACCOUNT_7: AccountId = 7;
+	pub const ACCOUNT_8: AccountId = 8;
+	pub const ACCOUNT_9: AccountId = 9;
+	pub const ACCOUNT_10: AccountId = 10;
+}
+
+use agents::*;
+
+parameter_types! {
+	pub static Targets: Vec<AccountId> = vec![ACCOUNT_0, ACCOUNT_1, ACCOUNT_2, ACCOUNT_3];
+	pub static Voters: Vec<VoterOf<Runtime>> = vec![
+		(ACCOUNT_0, 10, bounded_vec![ACCOUNT_9, ACCOUNT_10]),
+		(ACCOUNT_1, 10, bounded_vec![ACCOUNT_0, ACCOUNT_2]),
+		(ACCOUNT_2, 10, bounded_vec![ACCOUNT_0]),
+		(ACCOUNT_3, 10, bounded_vec![ACCOUNT_7, ACCOUNT_8, ACCOUNT_9, ACCOUNT_10]),
+		// self votes.
+		(ACCOUNT_10, 10, bounded_vec![ACCOUNT_10]),
+		(ACCOUNT_9, 20, bounded_vec![ACCOUNT_9]),
+		(ACCOUNT_8, 30, bounded_vec![ACCOUNT_8]),
+		(ACCOUNT_7, 40, bounded_vec![ACCOUNT_7]),
+	];
+}
+
+impl ExtBuilder {
+	pub fn build(self) -> sp_io::TestExternalities {
+		sp_tracing::try_init_simple();
+		let mut storage =
+			frame_system::GenesisConfig::default().build_storage::<Runtime>().unwrap();
+
+		let _ = pallet_balances::GenesisConfig::<Runtime> {
+			balances: vec![
+				(ACCOUNT_0, 100),
+				(ACCOUNT_1, 100),
+				(ACCOUNT_2, 100),
+				(ACCOUNT_3, 100),
+				(ACCOUNT_4, 100),
+				(ACCOUNT_5, 100),
+				(ACCOUNT_6, 100),
+				(ACCOUNT_7, 100),
+				(ACCOUNT_8, 100),
+				(ACCOUNT_9, 100),
+				(ACCOUNT_10, 100),
+			],
+		}
+		.assimilate_storage(&mut storage);
+
+		sp_io::TestExternalities::from(storage)
+	}
+
+	pub fn phases(self, signed: BlockNumber, unsigned: BlockNumber) -> Self {
+		<SignedPhase>::set(signed);
+		<UnsignedPhase>::set(unsigned);
+		self
+	}
+
+	pub fn add_voter(
+		self,
+		who: AccountId,
+		stake: Balance,
+		targets: BoundedVec<AccountId, MaxNominations>,
+	) -> Self {
+		VOTERS.with(|v| v.borrow_mut().push((who, stake, targets)));
+		self
+	}
+
+	pub fn build_and_execute(self, test: impl FnOnce() -> ()) {
+		self.build().execute_with(test)
+	}
+}
+
+// Fast forward `n` blocks.
+pub fn roll_to(n: BlockNumber) {
+	let now = System::block_number();
+	for i in now + 1..=n {
+		System::set_block_number(i);
+		ElectionProviderMultiPhase::on_initialize(i);
+		Staking::on_initialize(i);
+	}
+}
+
+// Fast forward until EPM signed phase.
+pub fn roll_to_signed() {
+	while !matches!(
+		ElectionProviderMultiPhase::current_phase(),
+		pallet_election_provider_multi_phase::Phase::Signed
+	) {
+		roll_to(System::block_number() + 1);
+	}
+}
+
+// Fast forward until EPM unsigned phase.
+pub fn roll_to_unsigned() {
+	while !matches!(
+		ElectionProviderMultiPhase::current_phase(),
+		pallet_election_provider_multi_phase::Phase::Unsigned(_)
+	) {
+		roll_to(System::block_number() + 1);
+	}
+}
+
+parameter_types! {
+	static EPMEventsIndex: usize = 0;
+	static SessionEventsIndex: usize = 0;
+	static StakingEventsIndex: usize = 0;
+}
+
+// TODO(gpestana): refactor to events_sinve_last_call() -> Vec<_>
+pub fn epm_events_since_last_call() -> Vec<pallet_election_provider_multi_phase::Event<Runtime>> {
+	let all: Vec<_> = System::events()
+		.into_iter()
+		.filter_map(|r| {
+			if let RuntimeEvent::ElectionProviderMultiPhase(inner) = r.event {
+				Some(inner)
+			} else {
+				None
+			}
+		})
+		.collect();
+	let seen = EPMEventsIndex::get();
+	EPMEventsIndex::set(all.len());
+	all.into_iter().skip(seen).collect()
+}
+
+// TODO(gpestana): refactor to events_sinve_last_call() -> Vec<_>
+pub fn session_events_since_last_call() -> Vec<pallet_session::Event> {
+	let all: Vec<_> = System::events()
+		.into_iter()
+		.filter_map(|r| if let RuntimeEvent::Session(inner) = r.event { Some(inner) } else { None })
+		.collect();
+	let seen = SessionEventsIndex::get();
+	SessionEventsIndex::set(all.len());
+	all.into_iter().skip(seen).collect()
+}
+
+// TODO(gpestana): refactor to events_sinve_last_call() -> Vec<_>
+pub fn staking_events_since_last_call() -> Vec<pallet_staking::Event<Runtime>> {
+	let all: Vec<_> = System::events()
+		.into_iter()
+		.filter_map(|r| if let RuntimeEvent::Staking(inner) = r.event { Some(inner) } else { None })
+		.collect();
+	let seen = StakingEventsIndex::get();
+	StakingEventsIndex::set(all.len());
+	all.into_iter().skip(seen).collect()
+}

From b818b2946c25ce1b9171c354fba72f53b2830283 Mon Sep 17 00:00:00 2001
From: gpestana <g6pestana@gmail.com>
Date: Sun, 1 Jan 2023 18:21:32 +0100
Subject: [PATCH 03/22] removes account helpers; adds staking, session, etc
 genesis

---
 .../test-election-provider/src/lib.rs         |  70 ++--
 .../test-election-provider/src/mock.rs        | 314 +++++++++++++-----
 2 files changed, 276 insertions(+), 108 deletions(-)

diff --git a/frame/election-provider-multi-phase/test-election-provider/src/lib.rs b/frame/election-provider-multi-phase/test-election-provider/src/lib.rs
index 1804eb5b79a26..b46e902ed0f97 100644
--- a/frame/election-provider-multi-phase/test-election-provider/src/lib.rs
+++ b/frame/election-provider-multi-phase/test-election-provider/src/lib.rs
@@ -18,34 +18,54 @@
 #![cfg(test)]
 mod mock;
 
-use frame_support::bounded_vec;
-use mock::{agents::*, *};
+pub(crate) const LOG_TARGET: &str = "tests::epm";
 
-#[test]
-fn test_extbuilder_and_helpers() {
-	ExtBuilder.phases(5, 5).build_and_execute(|| {
-		assert_eq!(Balances::free_balance(ACCOUNT_1), 100);
-
-		assert_eq!(System::block_number(), 0);
-		assert!(ElectionProviderMultiPhase::current_phase().is_off());
-
-		roll_to_signed();
-		assert!(ElectionProviderMultiPhase::current_phase().is_signed());
-		assert_eq!(System::block_number(), 5);
+use mock::*;
+use sp_core::Get;
 
-		roll_to_unsigned();
-		assert!(ElectionProviderMultiPhase::current_phase().is_unsigned());
-		assert_eq!(System::block_number(), 10);
-	});
+// syntactic sugar for logging.
+#[macro_export]
+macro_rules! log {
+	($level:tt, $patter:expr $(, $values:expr)* $(,)?) => {
+		log::$level!(
+			target: crate::LOG_TARGET,
+			concat!("🛠️  ", $patter)  $(, $values)*
+        )
+    };
+}
 
-	ExtBuilder
-		.add_voter(ACCOUNT_0, 100, bounded_vec![ACCOUNT_0, ACCOUNT_1])
-		.build_and_execute(|| {
-			// TODO: add staking genesis init in extbuilder
+fn log_current_time() {
+	log!(
+		trace,
+		"block: {:?}, session: {:?}, era: {:?}, EPM phase: {:?} ts: {:?}",
+		System::block_number(),
+		Session::current_index(),
+		Staking::current_era(),
+		ElectionProviderMultiPhase::current_phase(),
+		Timestamp::now()
+	);
+}
 
-			roll_to_unsigned();
-			let _snapshot = ElectionProviderMultiPhase::snapshot();
+#[test]
+fn block_session_and_era_advances_helpers() {
+	ExtBuilder::default().initialize_first_session(true).build_and_execute(|| {
+		let advance_by = 6;
+		for _ in 1..=advance_by {
+			log_current_time();
+			advance_session();
+		}
 
-			// TODO: check snapshot
-		});
+		// each session has `Period` blocks.
+		assert_eq!(System::block_number(), advance_by * Period::get());
+		// each era has `SessionsPerEra` sessions.
+		assert_eq!(
+			Staking::current_era().unwrap(),
+			Session::current_index() / <SessionsPerEra as Get<u32>>::get()
+		);
+	});
 }
+
+#[test]
+/// Replicates the [Kusama incident](https://hackmd.io/Dt1L-JMtRc2y5FiOQik88A) of 8th Dec 2022.
+///
+fn enters_emergency_phase_after_forcing_before_elect() {}
diff --git a/frame/election-provider-multi-phase/test-election-provider/src/mock.rs b/frame/election-provider-multi-phase/test-election-provider/src/mock.rs
index 44e0eb1c0e203..59e61af540987 100644
--- a/frame/election-provider-multi-phase/test-election-provider/src/mock.rs
+++ b/frame/election-provider-multi-phase/test-election-provider/src/mock.rs
@@ -15,18 +15,30 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-use frame_support::{bounded_vec, parameter_types, traits, traits::Hooks, BoundedVec};
+#![allow(dead_code)] // TODO(gpestana): remove when ready
+
+use frame_support::{
+	parameter_types, traits,
+	traits::{GenesisBuild, Hooks},
+};
 use frame_system::EnsureRoot;
-use sp_core::{ConstU32, H256};
+use sp_core::{ConstU32, Get, H256};
 use sp_npos_elections::{BalancingConfig, VoteWeight};
-use sp_runtime::{testing, traits::IdentityLookup, transaction_validity, PerU16, Perbill};
+use sp_runtime::{
+	testing,
+	traits::{IdentityLookup, Zero},
+	transaction_validity, PerU16, Perbill,
+};
+use sp_staking::{EraIndex, SessionIndex};
 use sp_std::prelude::*;
+use std::collections::BTreeMap;
 
 use frame_election_provider_support::{onchain, SequentialPhragmen, Weight};
-use pallet_election_provider_multi_phase::{
-	unsigned::{MinerConfig, VoterOf},
-	SolutionAccuracyOf,
-};
+use pallet_election_provider_multi_phase::{unsigned::MinerConfig, SolutionAccuracyOf};
+use pallet_staking::StakerStatus;
+
+pub const INIT_TIMESTAMP: u64 = 30_000;
+pub const BLOCK_TIME: u64 = 1000;
 
 type Block = frame_system::mocking::MockBlock<Runtime>;
 type UncheckedExtrinsic = frame_system::mocking::MockUncheckedExtrinsic<Runtime>;
@@ -44,6 +56,8 @@ frame_support::construct_runtime!(
 		Balances: pallet_balances,
 		BagsList: pallet_bags_list,
 		Session: pallet_session,
+		Historical: pallet_session::historical,
+		Timestamp: pallet_timestamp,
 	}
 );
 
@@ -102,17 +116,9 @@ parameter_types! {
 	pub static CapturedMoment: Option<Moment> = None;
 }
 
-// TOOD(gpestana) needed or can we set Timestamp::OnTimestampSet = ()?
-pub struct MockOnTimestampSet;
-impl traits::OnTimestampSet<Moment> for MockOnTimestampSet {
-	fn on_timestamp_set(moment: Moment) {
-		CapturedMoment::mutate(|x| *x = Some(moment));
-	}
-}
-
 impl pallet_timestamp::Config for Runtime {
 	type Moment = Moment;
-	type OnTimestampSet = MockOnTimestampSet;
+	type OnTimestampSet = ();
 	type MinimumPeriod = traits::ConstU64<5>;
 	type WeightInfo = ();
 }
@@ -218,7 +224,7 @@ const THRESHOLDS: [VoteWeight; 9] = [10, 20, 30, 40, 50, 60, 1_000, 2_000, 10_00
 
 parameter_types! {
 	pub static BagThresholds: &'static [sp_npos_elections::VoteWeight] = &THRESHOLDS;
-	pub const SessionsPerEra: sp_staking::SessionIndex = 1;
+	pub const SessionsPerEra: sp_staking::SessionIndex = 2;
 	pub const BondingDuration: sp_staking::EraIndex = 28;
 	pub const SlashDeferDuration: sp_staking::EraIndex = 7; // 1/4 the bonding duration.
 	pub const MaxNominatorRewardedPerValidator: u32 = 256;
@@ -238,7 +244,7 @@ impl pallet_staking::Config for Runtime {
 	type MaxNominations = MaxNominations;
 	type Currency = Balances;
 	type CurrencyBalance = Balance;
-	type UnixTime = pallet_timestamp::Pallet<Self>;
+	type UnixTime = Timestamp;
 	type CurrencyToVote = traits::SaturatingCurrencyToVote;
 	type RewardRemainder = ();
 	type RuntimeEvent = RuntimeEvent;
@@ -335,41 +341,41 @@ impl sp_runtime::BoundToRuntimeAppPublic for OtherSessionHandler {
 	type Public = testing::UintAuthorityId;
 }
 
-#[derive(Default)]
-pub struct ExtBuilder;
-
-pub mod agents {
-	use super::AccountId;
-
-	pub const ACCOUNT_0: AccountId = 0;
-	pub const ACCOUNT_1: AccountId = 1;
-	pub const ACCOUNT_2: AccountId = 2;
-	pub const ACCOUNT_3: AccountId = 3;
-	pub const ACCOUNT_4: AccountId = 4;
-	pub const ACCOUNT_5: AccountId = 5;
-	pub const ACCOUNT_6: AccountId = 6;
-	pub const ACCOUNT_7: AccountId = 7;
-	pub const ACCOUNT_8: AccountId = 8;
-	pub const ACCOUNT_9: AccountId = 9;
-	pub const ACCOUNT_10: AccountId = 10;
+pub struct ExtBuilder {
+	nominate: bool,
+	validator_count: u32,
+	minimum_validator_count: u32,
+	invulnerables: Vec<AccountId>,
+	has_stakers: bool,
+	initialize_first_session: bool,
+	pub min_nominator_bond: Balance,
+	min_validator_bond: Balance,
+	balance_factor: Balance,
+	status: BTreeMap<AccountId, StakerStatus<AccountId>>,
+	stakes: BTreeMap<AccountId, Balance>,
+	stakers: Vec<(AccountId, AccountId, Balance, StakerStatus<AccountId>)>,
+}
+
+impl Default for ExtBuilder {
+	fn default() -> Self {
+		Self {
+			nominate: true,
+			validator_count: 2,
+			minimum_validator_count: 0,
+			balance_factor: 1,
+			invulnerables: vec![],
+			has_stakers: true,
+			initialize_first_session: true,
+			min_nominator_bond: ExistentialDeposit::get(),
+			min_validator_bond: ExistentialDeposit::get(),
+			status: Default::default(),
+			stakes: Default::default(),
+			stakers: Default::default(),
+		}
+	}
 }
 
-use agents::*;
-
-parameter_types! {
-	pub static Targets: Vec<AccountId> = vec![ACCOUNT_0, ACCOUNT_1, ACCOUNT_2, ACCOUNT_3];
-	pub static Voters: Vec<VoterOf<Runtime>> = vec![
-		(ACCOUNT_0, 10, bounded_vec![ACCOUNT_9, ACCOUNT_10]),
-		(ACCOUNT_1, 10, bounded_vec![ACCOUNT_0, ACCOUNT_2]),
-		(ACCOUNT_2, 10, bounded_vec![ACCOUNT_0]),
-		(ACCOUNT_3, 10, bounded_vec![ACCOUNT_7, ACCOUNT_8, ACCOUNT_9, ACCOUNT_10]),
-		// self votes.
-		(ACCOUNT_10, 10, bounded_vec![ACCOUNT_10]),
-		(ACCOUNT_9, 20, bounded_vec![ACCOUNT_9]),
-		(ACCOUNT_8, 30, bounded_vec![ACCOUNT_8]),
-		(ACCOUNT_7, 40, bounded_vec![ACCOUNT_7]),
-	];
-}
+parameter_types! {}
 
 impl ExtBuilder {
 	pub fn build(self) -> sp_io::TestExternalities {
@@ -379,55 +385,197 @@ impl ExtBuilder {
 
 		let _ = pallet_balances::GenesisConfig::<Runtime> {
 			balances: vec![
-				(ACCOUNT_0, 100),
-				(ACCOUNT_1, 100),
-				(ACCOUNT_2, 100),
-				(ACCOUNT_3, 100),
-				(ACCOUNT_4, 100),
-				(ACCOUNT_5, 100),
-				(ACCOUNT_6, 100),
-				(ACCOUNT_7, 100),
-				(ACCOUNT_8, 100),
-				(ACCOUNT_9, 100),
-				(ACCOUNT_10, 100),
+				(1, 10 * self.balance_factor),
+				(2, 20 * self.balance_factor),
+				(3, 300 * self.balance_factor),
+				(4, 400 * self.balance_factor),
+				// controllers
+				(10, self.balance_factor),
+				(20, self.balance_factor),
+				(30, self.balance_factor),
+				(40, self.balance_factor),
+				(50, self.balance_factor),
+				// stashes
+				(11, self.balance_factor * 1000),
+				(21, self.balance_factor * 2000),
+				(31, self.balance_factor * 2000),
+				(41, self.balance_factor * 2000),
+				(51, self.balance_factor * 2000),
+				// optional nominator
+				(100, self.balance_factor * 2000),
+				(101, self.balance_factor * 2000),
+				// aux accounts
+				(60, self.balance_factor),
+				(61, self.balance_factor * 2000),
+				(70, self.balance_factor),
+				(71, self.balance_factor * 2000),
+				(80, self.balance_factor),
+				(81, self.balance_factor * 2000),
+				// This allows us to have a total_payout different from 0.
+				(999, 1_000_000_000_000),
 			],
 		}
 		.assimilate_storage(&mut storage);
 
-		sp_io::TestExternalities::from(storage)
-	}
+		let mut stakers = vec![];
+		if self.has_stakers {
+			stakers = vec![
+				// (stash, ctrl, stake, status)
+				// these two will be elected in the default test where we elect 2.
+				(11, 10, self.balance_factor * 1000, StakerStatus::<AccountId>::Validator),
+				(21, 20, self.balance_factor * 1000, StakerStatus::<AccountId>::Validator),
+				// a loser validator
+				(31, 30, self.balance_factor * 500, StakerStatus::<AccountId>::Validator),
+				// an idle validator
+				(41, 40, self.balance_factor * 1000, StakerStatus::<AccountId>::Idle),
+			];
+			// optionally add a nominator
+			if self.nominate {
+				stakers.push((
+					101,
+					100,
+					self.balance_factor * 500,
+					StakerStatus::<AccountId>::Nominator(vec![11, 21]),
+				))
+			}
+			// replace any of the status if needed.
+			self.status.into_iter().for_each(|(stash, status)| {
+				let (_, _, _, ref mut prev_status) = stakers
+					.iter_mut()
+					.find(|s| s.0 == stash)
+					.expect("set_status staker should exist; qed");
+				*prev_status = status;
+			});
+			// replaced any of the stakes if needed.
+			self.stakes.into_iter().for_each(|(stash, stake)| {
+				let (_, _, ref mut prev_stake, _) = stakers
+					.iter_mut()
+					.find(|s| s.0 == stash)
+					.expect("set_stake staker should exits; qed.");
+				*prev_stake = stake;
+			});
+			// extend stakers if needed.
+			stakers.extend(self.stakers)
+		}
+
+		let _ = pallet_staking::GenesisConfig::<Runtime> {
+			stakers: stakers.clone(),
+			validator_count: self.validator_count,
+			minimum_validator_count: self.minimum_validator_count,
+			invulnerables: self.invulnerables,
+			slash_reward_fraction: Perbill::from_percent(10),
+			min_nominator_bond: self.min_nominator_bond,
+			min_validator_bond: self.min_validator_bond,
+			..Default::default()
+		}
+		.assimilate_storage(&mut storage);
+
+		let _ = pallet_session::GenesisConfig::<Runtime> {
+			keys: if self.has_stakers {
+				// set the keys for the first session.
+				stakers
+					.into_iter()
+					.map(|(id, ..)| (id, id, SessionKeys { other: (id as u64).into() }))
+					.collect()
+			} else {
+				// set some dummy validators in genesis.
+				(0..self.validator_count as u128)
+					.map(|id| (id, id, SessionKeys { other: (id as u64).into() }))
+					.collect()
+			},
+		}
+		.assimilate_storage(&mut storage);
 
+		let mut ext = sp_io::TestExternalities::from(storage);
+
+		if self.initialize_first_session {
+			// We consider all test to start after timestamp is initialized This must be ensured by
+			// having `timestamp::on_initialize` called before `staking::on_initialize`. Also, if
+			// session length is 1, then it is already triggered.
+			ext.execute_with(|| {
+				System::set_block_number(1);
+				Session::on_initialize(1);
+				<Staking as Hooks<u64>>::on_initialize(1);
+				Timestamp::set_timestamp(INIT_TIMESTAMP);
+			});
+		}
+
+		ext
+	}
+	pub fn balance_factor(mut self, factor: Balance) -> Self {
+		self.balance_factor = factor;
+		self
+	}
+	pub fn initialize_first_session(mut self, init: bool) -> Self {
+		self.initialize_first_session = init;
+		self
+	}
 	pub fn phases(self, signed: BlockNumber, unsigned: BlockNumber) -> Self {
 		<SignedPhase>::set(signed);
 		<UnsignedPhase>::set(unsigned);
 		self
 	}
-
-	pub fn add_voter(
-		self,
-		who: AccountId,
-		stake: Balance,
-		targets: BoundedVec<AccountId, MaxNominations>,
-	) -> Self {
-		VOTERS.with(|v| v.borrow_mut().push((who, stake, targets)));
-		self
-	}
-
 	pub fn build_and_execute(self, test: impl FnOnce() -> ()) {
 		self.build().execute_with(test)
 	}
 }
 
-// Fast forward `n` blocks.
+// Progress to given block, triggering session and era changes as we progress.
 pub fn roll_to(n: BlockNumber) {
-	let now = System::block_number();
-	for i in now + 1..=n {
-		System::set_block_number(i);
-		ElectionProviderMultiPhase::on_initialize(i);
-		Staking::on_initialize(i);
+	for b in (System::block_number()) + 1..=n {
+		System::set_block_number(b);
+		Session::on_initialize(b);
+		Staking::on_initialize(b);
+		ElectionProviderMultiPhase::on_initialize(b);
+		Timestamp::set_timestamp(System::block_number() * BLOCK_TIME + INIT_TIMESTAMP);
+		if b != n {
+			Staking::on_finalize(System::block_number());
+		}
 	}
 }
 
+/// Progresses from the current block number (whatever that may be) to the `P * session_index + 1`.
+pub(crate) fn start_session(session_index: SessionIndex) {
+	let end: u64 = if Offset::get().is_zero() {
+		(session_index as u64) * Period::get()
+	} else {
+		Offset::get() + (session_index.saturating_sub(1) as u64) * Period::get()
+	};
+
+	roll_to(end);
+	// session must have progressed properly.
+	assert_eq!(
+		Session::current_index(),
+		session_index,
+		"current session index = {}, expected = {}",
+		Session::current_index(),
+		session_index,
+	);
+}
+
+/// Go one session forward.
+pub(crate) fn advance_session() {
+	let current_index = Session::current_index();
+	start_session(current_index + 1);
+}
+
+/// Progress until the given era.
+pub(crate) fn start_active_era(era_index: EraIndex) {
+	start_session((era_index * <SessionsPerEra as Get<u32>>::get()).into());
+	assert_eq!(active_era(), era_index);
+	// One way or another, current_era must have changed before the active era, so they must match
+	// at this point.
+	assert_eq!(current_era(), active_era());
+}
+
+pub(crate) fn active_era() -> EraIndex {
+	Staking::active_era().unwrap().index
+}
+
+pub(crate) fn current_era() -> EraIndex {
+	Staking::current_era().unwrap()
+}
+
 // Fast forward until EPM signed phase.
 pub fn roll_to_signed() {
 	while !matches!(
@@ -454,7 +602,7 @@ parameter_types! {
 	static StakingEventsIndex: usize = 0;
 }
 
-// TODO(gpestana): refactor to events_sinve_last_call() -> Vec<_>
+// TODO(gpestana): macro this
 pub fn epm_events_since_last_call() -> Vec<pallet_election_provider_multi_phase::Event<Runtime>> {
 	let all: Vec<_> = System::events()
 		.into_iter()
@@ -471,7 +619,7 @@ pub fn epm_events_since_last_call() -> Vec<pallet_election_provider_multi_phase:
 	all.into_iter().skip(seen).collect()
 }
 
-// TODO(gpestana): refactor to events_sinve_last_call() -> Vec<_>
+// TODO(gpestana): macro this
 pub fn session_events_since_last_call() -> Vec<pallet_session::Event> {
 	let all: Vec<_> = System::events()
 		.into_iter()

From 624c728619fc608c8bb06bd018c83112e3bf99b2 Mon Sep 17 00:00:00 2001
From: gpestana <g6pestana@gmail.com>
Date: Mon, 2 Jan 2023 01:03:04 +0100
Subject: [PATCH 04/22] Adds kusama incident test case

---
 .../test-election-provider/src/lib.rs         |  82 ++++++++++---
 .../test-election-provider/src/mock.rs        | 110 ++++++++++--------
 2 files changed, 127 insertions(+), 65 deletions(-)

diff --git a/frame/election-provider-multi-phase/test-election-provider/src/lib.rs b/frame/election-provider-multi-phase/test-election-provider/src/lib.rs
index b46e902ed0f97..16aa43979e577 100644
--- a/frame/election-provider-multi-phase/test-election-provider/src/lib.rs
+++ b/frame/election-provider-multi-phase/test-election-provider/src/lib.rs
@@ -22,6 +22,9 @@ pub(crate) const LOG_TARGET: &str = "tests::epm";
 
 use mock::*;
 use sp_core::Get;
+use sp_npos_elections::{to_supports, StakedAssignment};
+
+use crate::mock::RuntimeOrigin;
 
 // syntactic sugar for logging.
 #[macro_export]
@@ -47,25 +50,72 @@ fn log_current_time() {
 }
 
 #[test]
-fn block_session_and_era_advances_helpers() {
+/// Replicates the Kusama incident of 8th Dec 2022 and its resolution through the governance
+/// fallback.
+///
+/// After enough slashes to exceed the `Staking::OffendingValidatorsThreshold`, the staking pallet
+/// set `Forcing::ForceNew`. When a new session starts, staking will start to force a new era and
+/// calls <EPM as election_provider>::elect(). If at this point EPM and the staking miners did not
+/// have enough time to queue a new solution (snapshot + solution submission), the election request
+/// fails. If there is no election fallback mechanism in place, EPM enters in emergency mode.
+/// Recovery: Once EPM is in emergency mode, subsequent calls to `elect()` will fail until a new
+/// solution is added to EPM's `QueuedSolution` queue. This can be achieved through
+/// `Call::set_emergency_election_result` or `Call::governance_fallback` dispatchables. Once a new
+/// solution is added to the queue, EPM phase transitions to `Phase::Off` and the election flow
+/// restarts.
+fn enters_emergency_phase_after_forcing_before_elect() {
 	ExtBuilder::default().initialize_first_session(true).build_and_execute(|| {
-		let advance_by = 6;
-		for _ in 1..=advance_by {
-			log_current_time();
-			advance_session();
-		}
-
-		// each session has `Period` blocks.
-		assert_eq!(System::block_number(), advance_by * Period::get());
-		// each era has `SessionsPerEra` sessions.
-		assert_eq!(
-			Staking::current_era().unwrap(),
-			Session::current_index() / <SessionsPerEra as Get<u32>>::get()
+		log!(
+			trace,
+			"current validators (staking): {:?}",
+			<Runtime as pallet_staking::SessionInterface<AccountId>>::validators()
 		);
+		let session_validators_before = Session::validators();
+
+		roll_to_epm_off();
+		assert!(ElectionProviderMultiPhase::current_phase().is_off());
+
+		assert_eq!(pallet_staking::ForceEra::<Runtime>::get(), pallet_staking::Forcing::NotForcing);
+		// slashes until staking gets into `Forcing::ForceNew`.
+		add_slash(&11);
+
+		assert_eq!(pallet_staking::ForceEra::<Runtime>::get(), pallet_staking::Forcing::ForceNew);
+
+		advance_session();
+		assert!(ElectionProviderMultiPhase::current_phase().is_emergency());
+
+		// try to advance 2 eras.
+		advance_n_sessions(<SessionsPerEra as Get<u32>>::get().into());
+		advance_n_sessions(<SessionsPerEra as Get<u32>>::get().into());
+
+		// EPM is still in emergency phase.
+		assert!(ElectionProviderMultiPhase::current_phase().is_emergency());
+
+		// session validator set remains the same.
+		assert_eq!(Session::validators(), session_validators_before);
+
+		// performs recovery through the set emergency result.
+		let supports = to_supports(&vec![
+			StakedAssignment { who: 21, distribution: vec![(21, 10)] },
+			StakedAssignment { who: 31, distribution: vec![(21, 10), (31, 10)] },
+			StakedAssignment { who: 41, distribution: vec![(41, 10)] },
+		]);
+		assert!(ElectionProviderMultiPhase::set_emergency_election_result(
+			RuntimeOrigin::root(),
+			supports
+		)
+		.is_ok());
+
+		// EPM can now roll to signed phase to proceed with elections. The validator set is the
+		// expected (ie. set through `set_emergency_election_result`).
+		roll_to_epm_signed();
+		assert!(ElectionProviderMultiPhase::current_phase().is_signed());
+		assert_eq!(Session::validators(), vec![21, 31, 41]);
 	});
 }
 
 #[test]
-/// Replicates the [Kusama incident](https://hackmd.io/Dt1L-JMtRc2y5FiOQik88A) of 8th Dec 2022.
-///
-fn enters_emergency_phase_after_forcing_before_elect() {}
+/// Continously slash validators in the validator set while in emergency phase.
+fn continuous_slashes_in_emergency() {
+	// TODO(gpestana)
+}
diff --git a/frame/election-provider-multi-phase/test-election-provider/src/mock.rs b/frame/election-provider-multi-phase/test-election-provider/src/mock.rs
index 59e61af540987..ef70d131d7f54 100644
--- a/frame/election-provider-multi-phase/test-election-provider/src/mock.rs
+++ b/frame/election-provider-multi-phase/test-election-provider/src/mock.rs
@@ -29,7 +29,10 @@ use sp_runtime::{
 	traits::{IdentityLookup, Zero},
 	transaction_validity, PerU16, Perbill,
 };
-use sp_staking::{EraIndex, SessionIndex};
+use sp_staking::{
+	offence::{DisableStrategy, OffenceDetails, OnOffenceHandler},
+	EraIndex, SessionIndex,
+};
 use sp_std::prelude::*;
 use std::collections::BTreeMap;
 
@@ -162,7 +165,7 @@ frame_election_provider_support::generate_solution_type!(
 
 parameter_types! {
 	pub static SignedPhase: BlockNumber = 10;
-	pub static UnsignedPhase: BlockNumber = 5;
+	pub static UnsignedPhase: BlockNumber = 1;
 	pub static MaxElectingVoters: VoterIndex = 1000;
 	pub static MaxElectableTargets: TargetIndex = 1000;
 	pub static MaxActiveValidators: u32 = 1000;
@@ -197,7 +200,8 @@ impl pallet_election_provider_multi_phase::Config for Runtime {
 	type SlashHandler = ();
 	type RewardHandler = ();
 	type DataProvider = Staking;
-	type Fallback = onchain::OnChainExecution<OnChainSeqPhragmen>;
+	type Fallback =
+		frame_election_provider_support::NoElection<(AccountId, BlockNumber, Staking, MaxWinners)>;
 	type GovernanceFallback = onchain::OnChainExecution<OnChainSeqPhragmen>;
 	type Solver = SequentialPhragmen<AccountId, SolutionAccuracyOf<Runtime>, Balancing>;
 	type ForceOrigin = EnsureRoot<AccountId>;
@@ -228,7 +232,7 @@ parameter_types! {
 	pub const BondingDuration: sp_staking::EraIndex = 28;
 	pub const SlashDeferDuration: sp_staking::EraIndex = 7; // 1/4 the bonding duration.
 	pub const MaxNominatorRewardedPerValidator: u32 = 256;
-	pub const OffendingValidatorsThreshold: Perbill = Perbill::from_percent(17);
+	pub const OffendingValidatorsThreshold: Perbill = Perbill::from_percent(10);
 	pub HistoryDepth: u32 = 84;
 }
 
@@ -534,6 +538,11 @@ pub fn roll_to(n: BlockNumber) {
 	}
 }
 
+// Progress one block.
+pub fn roll_one() {
+	roll_to(System::block_number() + 1);
+}
+
 /// Progresses from the current block number (whatever that may be) to the `P * session_index + 1`.
 pub(crate) fn start_session(session_index: SessionIndex) {
 	let end: u64 = if Offset::get().is_zero() {
@@ -559,6 +568,14 @@ pub(crate) fn advance_session() {
 	start_session(current_index + 1);
 }
 
+/// Advances `n` sessions forward.
+pub(crate) fn advance_n_sessions(n: u32) {
+	let current_index = Session::current_index();
+	for i in 0..n {
+		start_session(current_index + i);
+	}
+}
+
 /// Progress until the given era.
 pub(crate) fn start_active_era(era_index: EraIndex) {
 	start_session((era_index * <SessionsPerEra as Get<u32>>::get()).into());
@@ -568,6 +585,10 @@ pub(crate) fn start_active_era(era_index: EraIndex) {
 	assert_eq!(current_era(), active_era());
 }
 
+pub(crate) fn start_next_active_era() {
+	start_active_era(active_era() + 1)
+}
+
 pub(crate) fn active_era() -> EraIndex {
 	Staking::active_era().unwrap().index
 }
@@ -577,7 +598,7 @@ pub(crate) fn current_era() -> EraIndex {
 }
 
 // Fast forward until EPM signed phase.
-pub fn roll_to_signed() {
+pub fn roll_to_epm_signed() {
 	while !matches!(
 		ElectionProviderMultiPhase::current_phase(),
 		pallet_election_provider_multi_phase::Phase::Signed
@@ -587,7 +608,7 @@ pub fn roll_to_signed() {
 }
 
 // Fast forward until EPM unsigned phase.
-pub fn roll_to_unsigned() {
+pub fn roll_to_epm_unsigned() {
 	while !matches!(
 		ElectionProviderMultiPhase::current_phase(),
 		pallet_election_provider_multi_phase::Phase::Unsigned(_)
@@ -596,47 +617,38 @@ pub fn roll_to_unsigned() {
 	}
 }
 
-parameter_types! {
-	static EPMEventsIndex: usize = 0;
-	static SessionEventsIndex: usize = 0;
-	static StakingEventsIndex: usize = 0;
-}
-
-// TODO(gpestana): macro this
-pub fn epm_events_since_last_call() -> Vec<pallet_election_provider_multi_phase::Event<Runtime>> {
-	let all: Vec<_> = System::events()
-		.into_iter()
-		.filter_map(|r| {
-			if let RuntimeEvent::ElectionProviderMultiPhase(inner) = r.event {
-				Some(inner)
-			} else {
-				None
-			}
-		})
-		.collect();
-	let seen = EPMEventsIndex::get();
-	EPMEventsIndex::set(all.len());
-	all.into_iter().skip(seen).collect()
-}
-
-// TODO(gpestana): macro this
-pub fn session_events_since_last_call() -> Vec<pallet_session::Event> {
-	let all: Vec<_> = System::events()
-		.into_iter()
-		.filter_map(|r| if let RuntimeEvent::Session(inner) = r.event { Some(inner) } else { None })
-		.collect();
-	let seen = SessionEventsIndex::get();
-	SessionEventsIndex::set(all.len());
-	all.into_iter().skip(seen).collect()
-}
-
-// TODO(gpestana): refactor to events_sinve_last_call() -> Vec<_>
-pub fn staking_events_since_last_call() -> Vec<pallet_staking::Event<Runtime>> {
-	let all: Vec<_> = System::events()
-		.into_iter()
-		.filter_map(|r| if let RuntimeEvent::Staking(inner) = r.event { Some(inner) } else { None })
-		.collect();
-	let seen = StakingEventsIndex::get();
-	StakingEventsIndex::set(all.len());
-	all.into_iter().skip(seen).collect()
+// Fast forward until EPM off.
+pub fn roll_to_epm_off() {
+	while !matches!(
+		ElectionProviderMultiPhase::current_phase(),
+		pallet_election_provider_multi_phase::Phase::Off
+	) {
+		roll_to(System::block_number() + 1);
+	}
+}
+
+pub(crate) fn on_offence_now(
+	offenders: &[OffenceDetails<
+		AccountId,
+		pallet_session::historical::IdentificationTuple<Runtime>,
+	>],
+	slash_fraction: &[Perbill],
+) {
+	let now = Staking::active_era().unwrap().index;
+	let _ = Staking::on_offence(
+		offenders,
+		slash_fraction,
+		Staking::eras_start_session_index(now).unwrap(),
+		DisableStrategy::WhenSlashed,
+	);
+}
+
+pub(crate) fn add_slash(who: &AccountId) {
+	on_offence_now(
+		&[OffenceDetails {
+			offender: (*who, Staking::eras_stakers(active_era(), *who)),
+			reporters: vec![],
+		}],
+		&[Perbill::from_percent(10)],
+	);
 }

From 73197ae3c359b27701412a8f78de1e772d3a1e2a Mon Sep 17 00:00:00 2001
From: gpestana <g6pestana@gmail.com>
Date: Thu, 5 Jan 2023 13:47:24 +0100
Subject: [PATCH 05/22] Prepare for slashing test

---
 .../test-election-provider/src/lib.rs         | 45 ++++++++++-
 .../test-election-provider/src/mock.rs        | 77 +++++++++++--------
 2 files changed, 86 insertions(+), 36 deletions(-)

diff --git a/frame/election-provider-multi-phase/test-election-provider/src/lib.rs b/frame/election-provider-multi-phase/test-election-provider/src/lib.rs
index 16aa43979e577..d4d9f0a802078 100644
--- a/frame/election-provider-multi-phase/test-election-provider/src/lib.rs
+++ b/frame/election-provider-multi-phase/test-election-provider/src/lib.rs
@@ -74,6 +74,7 @@ fn enters_emergency_phase_after_forcing_before_elect() {
 
 		roll_to_epm_off();
 		assert!(ElectionProviderMultiPhase::current_phase().is_off());
+		log_current_time();
 
 		assert_eq!(pallet_staking::ForceEra::<Runtime>::get(), pallet_staking::Forcing::NotForcing);
 		// slashes until staking gets into `Forcing::ForceNew`.
@@ -83,6 +84,7 @@ fn enters_emergency_phase_after_forcing_before_elect() {
 
 		advance_session();
 		assert!(ElectionProviderMultiPhase::current_phase().is_emergency());
+		log_current_time();
 
 		// try to advance 2 eras.
 		advance_n_sessions(<SessionsPerEra as Get<u32>>::get().into());
@@ -109,13 +111,50 @@ fn enters_emergency_phase_after_forcing_before_elect() {
 		// EPM can now roll to signed phase to proceed with elections. The validator set is the
 		// expected (ie. set through `set_emergency_election_result`).
 		roll_to_epm_signed();
+		log_current_time();
 		assert!(ElectionProviderMultiPhase::current_phase().is_signed());
 		assert_eq!(Session::validators(), vec![21, 31, 41]);
 	});
 }
 
 #[test]
-/// Continously slash validators in the validator set while in emergency phase.
-fn continuous_slashes_in_emergency() {
-	// TODO(gpestana)
+/// Continously slash 10% of the active validators per era, even during the emergency phase.
+fn continous_slashes() {
+	ExtBuilder::default()
+		.initialize_first_session(true)
+		.validator_count(10)
+		.build_and_execute(|| {
+			assert_eq!(Session::validators().len(), 10);
+
+			roll_to_epm_off();
+			assert!(ElectionProviderMultiPhase::current_phase().is_off());
+
+			println!(
+				"slashing 11, set: {:?} - {:?}",
+				Session::validators(),
+				ElectionProviderMultiPhase::current_phase()
+			);
+			add_slash(&11);
+			advance_n_sessions(<SessionsPerEra as Get<u32>>::get().into());
+			assert_eq!(
+				pallet_staking::ForceEra::<Runtime>::get(),
+				pallet_staking::Forcing::NotForcing
+			);
+
+			println!(
+				"slashing 12, set: {:?} - {:?}",
+				Session::validators(),
+				ElectionProviderMultiPhase::current_phase()
+			);
+			add_slash(&12);
+			advance_n_sessions(<SessionsPerEra as Get<u32>>::get().into());
+			assert_eq!(
+				pallet_staking::ForceEra::<Runtime>::get(),
+				pallet_staking::Forcing::NotForcing
+			);
+		});
 }
+
+#[test]
+/// Continously slash 10% of the active validators per era while in emergency phase.
+fn continuous_slashes_in_emergency() {}
diff --git a/frame/election-provider-multi-phase/test-election-provider/src/mock.rs b/frame/election-provider-multi-phase/test-election-provider/src/mock.rs
index ef70d131d7f54..cab1e5681a205 100644
--- a/frame/election-provider-multi-phase/test-election-provider/src/mock.rs
+++ b/frame/election-provider-multi-phase/test-election-provider/src/mock.rs
@@ -15,11 +15,12 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#![allow(dead_code)] // TODO(gpestana): remove when ready
+#![allow(dead_code)]
 
 use frame_support::{
 	parameter_types, traits,
 	traits::{GenesisBuild, Hooks},
+	weights::constants,
 };
 use frame_system::EnsureRoot;
 use sp_core::{ConstU32, Get, H256};
@@ -74,7 +75,7 @@ pub(crate) type Moment = u64;
 
 impl frame_system::Config for Runtime {
 	type BaseCallFilter = traits::Everything;
-	type BlockWeights = ();
+	type BlockWeights = BlockWeights;
 	type BlockLength = ();
 	type DbWeight = ();
 	type RuntimeOrigin = RuntimeOrigin;
@@ -99,8 +100,14 @@ impl frame_system::Config for Runtime {
 	type MaxConsumers = traits::ConstU32<16>;
 }
 
+const NORMAL_DISPATCH_RATIO: Perbill = Perbill::from_percent(75);
 parameter_types! {
 	pub static ExistentialDeposit: Balance = 1;
+	pub BlockWeights: frame_system::limits::BlockWeights = frame_system::limits::BlockWeights
+		::with_sensible_defaults(
+			Weight::from_parts(2u64 * constants::WEIGHT_REF_TIME_PER_SECOND, u64::MAX),
+			NORMAL_DISPATCH_RATIO,
+		);
 }
 
 impl pallet_balances::Config for Runtime {
@@ -165,7 +172,7 @@ frame_election_provider_support::generate_solution_type!(
 
 parameter_types! {
 	pub static SignedPhase: BlockNumber = 10;
-	pub static UnsignedPhase: BlockNumber = 1;
+	pub static UnsignedPhase: BlockNumber = 5;
 	pub static MaxElectingVoters: VoterIndex = 1000;
 	pub static MaxElectableTargets: TargetIndex = 1000;
 	pub static MaxActiveValidators: u32 = 1000;
@@ -173,6 +180,8 @@ parameter_types! {
 	pub static BetterSignedThreshold: Perbill = Perbill::zero();
 	pub static BetterUnsignedThreshold: Perbill = Perbill::zero();
 	pub static OffchainRepeat: u32 = 5;
+	pub static MinerMaxLength: u32 = 256;
+	pub static MinerMaxWeight: Weight = BlockWeights::get().max_block;
 	pub static TransactionPriority: transaction_validity::TransactionPriority = 1;
 	pub static MaxWinners: u32 = 100;
 	pub static MaxVotesPerVoter: u32 = 16;
@@ -216,10 +225,10 @@ impl MinerConfig for Runtime {
 	type AccountId = AccountId;
 	type Solution = MockNposSolution;
 	type MaxVotesPerVoter = MaxNominations;
-	type MaxLength = ();
-	type MaxWeight = ();
+	type MaxLength = MinerMaxLength;
+	type MaxWeight = MinerMaxWeight;
 
-	fn solution_weight(_voters: u32, _targets: u32, _active_voters: u32, _degree: u32) -> Weight {
+	fn solution_weight(_v: u32, _t: u32, _a: u32, _d: u32) -> Weight {
 		Weight::zero()
 	}
 }
@@ -232,7 +241,7 @@ parameter_types! {
 	pub const BondingDuration: sp_staking::EraIndex = 28;
 	pub const SlashDeferDuration: sp_staking::EraIndex = 7; // 1/4 the bonding duration.
 	pub const MaxNominatorRewardedPerValidator: u32 = 256;
-	pub const OffendingValidatorsThreshold: Perbill = Perbill::from_percent(10);
+	pub const OffendingValidatorsThreshold: Perbill = Perbill::from_percent(40);
 	pub HistoryDepth: u32 = 84;
 }
 
@@ -346,7 +355,6 @@ impl sp_runtime::BoundToRuntimeAppPublic for OtherSessionHandler {
 }
 
 pub struct ExtBuilder {
-	nominate: bool,
 	validator_count: u32,
 	minimum_validator_count: u32,
 	invulnerables: Vec<AccountId>,
@@ -363,7 +371,6 @@ pub struct ExtBuilder {
 impl Default for ExtBuilder {
 	fn default() -> Self {
 		Self {
-			nominate: true,
 			validator_count: 2,
 			minimum_validator_count: 0,
 			balance_factor: 1,
@@ -399,22 +406,24 @@ impl ExtBuilder {
 				(30, self.balance_factor),
 				(40, self.balance_factor),
 				(50, self.balance_factor),
-				// stashes
-				(11, self.balance_factor * 1000),
-				(21, self.balance_factor * 2000),
-				(31, self.balance_factor * 2000),
-				(41, self.balance_factor * 2000),
-				(51, self.balance_factor * 2000),
-				// optional nominator
-				(100, self.balance_factor * 2000),
-				(101, self.balance_factor * 2000),
-				// aux accounts
 				(60, self.balance_factor),
-				(61, self.balance_factor * 2000),
 				(70, self.balance_factor),
-				(71, self.balance_factor * 2000),
 				(80, self.balance_factor),
-				(81, self.balance_factor * 2000),
+				(90, self.balance_factor),
+				(100, self.balance_factor),
+				(200, self.balance_factor),
+				// stashes
+				(11, self.balance_factor * 1000),
+				(21, self.balance_factor * 2000),
+				(31, self.balance_factor * 3000),
+				(41, self.balance_factor * 4000),
+				(51, self.balance_factor * 5000),
+				(61, self.balance_factor * 6000),
+				(71, self.balance_factor * 7000),
+				(81, self.balance_factor * 8000),
+				(91, self.balance_factor * 9000),
+				(101, self.balance_factor * 10000),
+				(201, self.balance_factor * 20000),
 				// This allows us to have a total_payout different from 0.
 				(999, 1_000_000_000_000),
 			],
@@ -428,20 +437,18 @@ impl ExtBuilder {
 				// these two will be elected in the default test where we elect 2.
 				(11, 10, self.balance_factor * 1000, StakerStatus::<AccountId>::Validator),
 				(21, 20, self.balance_factor * 1000, StakerStatus::<AccountId>::Validator),
-				// a loser validator
+				// loser validatos if validator_count() is default.
 				(31, 30, self.balance_factor * 500, StakerStatus::<AccountId>::Validator),
+				(41, 40, self.balance_factor * 500, StakerStatus::<AccountId>::Validator),
+				(51, 50, self.balance_factor * 500, StakerStatus::<AccountId>::Validator),
+				(61, 60, self.balance_factor * 500, StakerStatus::<AccountId>::Validator),
+				(71, 70, self.balance_factor * 500, StakerStatus::<AccountId>::Validator),
+				(81, 80, self.balance_factor * 500, StakerStatus::<AccountId>::Validator),
+				(91, 90, self.balance_factor * 500, StakerStatus::<AccountId>::Validator),
+				(101, 100, self.balance_factor * 500, StakerStatus::<AccountId>::Validator),
 				// an idle validator
-				(41, 40, self.balance_factor * 1000, StakerStatus::<AccountId>::Idle),
+				(201, 200, self.balance_factor * 1000, StakerStatus::<AccountId>::Idle),
 			];
-			// optionally add a nominator
-			if self.nominate {
-				stakers.push((
-					101,
-					100,
-					self.balance_factor * 500,
-					StakerStatus::<AccountId>::Nominator(vec![11, 21]),
-				))
-			}
 			// replace any of the status if needed.
 			self.status.into_iter().for_each(|(stash, status)| {
 				let (_, _, _, ref mut prev_status) = stakers
@@ -519,6 +526,10 @@ impl ExtBuilder {
 		<UnsignedPhase>::set(unsigned);
 		self
 	}
+	pub fn validator_count(mut self, n: u32) -> Self {
+		self.validator_count = n;
+		self
+	}
 	pub fn build_and_execute(self, test: impl FnOnce() -> ()) {
 		self.build().execute_with(test)
 	}

From 762b0c0fc2938fbd7f52602a90e66b3f88f96762 Mon Sep 17 00:00:00 2001
From: gpestana <g6pestana@gmail.com>
Date: Fri, 6 Jan 2023 17:59:01 +0100
Subject: [PATCH 06/22] Adds solution submission

---
 .../test-election-provider/src/lib.rs         | 29 ++++---
 .../test-election-provider/src/mock.rs        | 81 +++++++++++++------
 2 files changed, 74 insertions(+), 36 deletions(-)

diff --git a/frame/election-provider-multi-phase/test-election-provider/src/lib.rs b/frame/election-provider-multi-phase/test-election-provider/src/lib.rs
index d4d9f0a802078..160dffdbda4d5 100644
--- a/frame/election-provider-multi-phase/test-election-provider/src/lib.rs
+++ b/frame/election-provider-multi-phase/test-election-provider/src/lib.rs
@@ -21,7 +21,6 @@ mod mock;
 pub(crate) const LOG_TARGET: &str = "tests::epm";
 
 use mock::*;
-use sp_core::Get;
 use sp_npos_elections::{to_supports, StakedAssignment};
 
 use crate::mock::RuntimeOrigin;
@@ -49,6 +48,18 @@ fn log_current_time() {
 	);
 }
 
+#[test]
+fn setup_works() {
+	ExtBuilder::default().initialize_first_session(true).build_and_execute(|| {
+		assert_eq!(active_era(), 0);
+
+		start_next_active_era();
+		start_next_active_era();
+		start_next_active_era();
+		start_next_active_era();
+	});
+}
+
 #[test]
 /// Replicates the Kusama incident of 8th Dec 2022 and its resolution through the governance
 /// fallback.
@@ -82,13 +93,13 @@ fn enters_emergency_phase_after_forcing_before_elect() {
 
 		assert_eq!(pallet_staking::ForceEra::<Runtime>::get(), pallet_staking::Forcing::ForceNew);
 
-		advance_session();
+		advance_session_delayed_solution();
 		assert!(ElectionProviderMultiPhase::current_phase().is_emergency());
 		log_current_time();
 
-		// try to advance 2 eras.
-		advance_n_sessions(<SessionsPerEra as Get<u32>>::get().into());
-		advance_n_sessions(<SessionsPerEra as Get<u32>>::get().into());
+		// try to advance 2 eras with a delayed solution.
+		start_next_active_era_delayed_solution();
+		start_next_active_era_delayed_solution();
 
 		// EPM is still in emergency phase.
 		assert!(ElectionProviderMultiPhase::current_phase().is_emergency());
@@ -135,7 +146,7 @@ fn continous_slashes() {
 				ElectionProviderMultiPhase::current_phase()
 			);
 			add_slash(&11);
-			advance_n_sessions(<SessionsPerEra as Get<u32>>::get().into());
+			start_next_active_era();
 			assert_eq!(
 				pallet_staking::ForceEra::<Runtime>::get(),
 				pallet_staking::Forcing::NotForcing
@@ -147,14 +158,10 @@ fn continous_slashes() {
 				ElectionProviderMultiPhase::current_phase()
 			);
 			add_slash(&12);
-			advance_n_sessions(<SessionsPerEra as Get<u32>>::get().into());
+			start_next_active_era();
 			assert_eq!(
 				pallet_staking::ForceEra::<Runtime>::get(),
 				pallet_staking::Forcing::NotForcing
 			);
 		});
 }
-
-#[test]
-/// Continously slash 10% of the active validators per era while in emergency phase.
-fn continuous_slashes_in_emergency() {}
diff --git a/frame/election-provider-multi-phase/test-election-provider/src/mock.rs b/frame/election-provider-multi-phase/test-election-provider/src/mock.rs
index cab1e5681a205..337b246d1040d 100644
--- a/frame/election-provider-multi-phase/test-election-provider/src/mock.rs
+++ b/frame/election-provider-multi-phase/test-election-provider/src/mock.rs
@@ -38,9 +38,13 @@ use sp_std::prelude::*;
 use std::collections::BTreeMap;
 
 use frame_election_provider_support::{onchain, SequentialPhragmen, Weight};
-use pallet_election_provider_multi_phase::{unsigned::MinerConfig, SolutionAccuracyOf};
+use pallet_election_provider_multi_phase::{
+	unsigned::MinerConfig, ElectionCompute, QueuedSolution, SolutionAccuracyOf,
+};
 use pallet_staking::StakerStatus;
 
+use crate::log_current_time;
+
 pub const INIT_TIMESTAMP: u64 = 30_000;
 pub const BLOCK_TIME: u64 = 1000;
 
@@ -535,34 +539,48 @@ impl ExtBuilder {
 	}
 }
 
-// Progress to given block, triggering session and era changes as we progress.
-pub fn roll_to(n: BlockNumber) {
+// Progress to given block, triggering session and era changes as we progress and ensuring that
+// there is a solution queued when expected.
+pub fn roll_to(n: BlockNumber, delay_solution: bool) {
 	for b in (System::block_number()) + 1..=n {
 		System::set_block_number(b);
 		Session::on_initialize(b);
-		Staking::on_initialize(b);
-		ElectionProviderMultiPhase::on_initialize(b);
 		Timestamp::set_timestamp(System::block_number() * BLOCK_TIME + INIT_TIMESTAMP);
+
+		// if EPM is in off phase, there's no solution and the solution should not be delayed, try
+		// minining and queue a solution.
+		if ElectionProviderMultiPhase::snapshot().is_none() &&
+			ElectionProviderMultiPhase::current_phase().is_off() &&
+			!delay_solution
+		{
+			ElectionProviderMultiPhase::on_initialize(n);
+			let _ = try_queue_solution(ElectionCompute::Signed);
+		} else {
+			ElectionProviderMultiPhase::on_initialize(n);
+		};
+		Staking::on_initialize(b);
 		if b != n {
 			Staking::on_finalize(System::block_number());
 		}
 	}
+	log_current_time();
 }
 
 // Progress one block.
-pub fn roll_one() {
-	roll_to(System::block_number() + 1);
+pub fn roll_one(delay_solution: bool) {
+	roll_to(System::block_number() + 1, delay_solution);
 }
 
 /// Progresses from the current block number (whatever that may be) to the `P * session_index + 1`.
-pub(crate) fn start_session(session_index: SessionIndex) {
+pub(crate) fn start_session(session_index: SessionIndex, delay_solution: bool) {
 	let end: u64 = if Offset::get().is_zero() {
 		(session_index as u64) * Period::get()
 	} else {
 		Offset::get() + (session_index.saturating_sub(1) as u64) * Period::get()
 	};
 
-	roll_to(end);
+	roll_to(end, delay_solution);
+
 	// session must have progressed properly.
 	assert_eq!(
 		Session::current_index(),
@@ -576,28 +594,31 @@ pub(crate) fn start_session(session_index: SessionIndex) {
 /// Go one session forward.
 pub(crate) fn advance_session() {
 	let current_index = Session::current_index();
-	start_session(current_index + 1);
+	start_session(current_index + 1, false);
 }
 
-/// Advances `n` sessions forward.
-pub(crate) fn advance_n_sessions(n: u32) {
+pub(crate) fn advance_session_delayed_solution() {
 	let current_index = Session::current_index();
-	for i in 0..n {
-		start_session(current_index + i);
-	}
+	start_session(current_index + 1, true);
 }
 
 /// Progress until the given era.
-pub(crate) fn start_active_era(era_index: EraIndex) {
-	start_session((era_index * <SessionsPerEra as Get<u32>>::get()).into());
-	assert_eq!(active_era(), era_index);
-	// One way or another, current_era must have changed before the active era, so they must match
-	// at this point.
-	assert_eq!(current_era(), active_era());
+pub(crate) fn start_active_era(era_index: EraIndex, delay_solution: bool) {
+	start_session((era_index * <SessionsPerEra as Get<u32>>::get()).into(), delay_solution);
+
+	// if the solution was not delayed, era should have progressed.
+	if !delay_solution {
+		assert_eq!(active_era(), era_index);
+		assert_eq!(current_era(), active_era());
+	}
 }
 
 pub(crate) fn start_next_active_era() {
-	start_active_era(active_era() + 1)
+	start_active_era(active_era() + 1, false)
+}
+
+pub(crate) fn start_next_active_era_delayed_solution() {
+	start_active_era(active_era() + 1, true)
 }
 
 pub(crate) fn active_era() -> EraIndex {
@@ -614,7 +635,7 @@ pub fn roll_to_epm_signed() {
 		ElectionProviderMultiPhase::current_phase(),
 		pallet_election_provider_multi_phase::Phase::Signed
 	) {
-		roll_to(System::block_number() + 1);
+		roll_to(System::block_number() + 1, false);
 	}
 }
 
@@ -624,7 +645,7 @@ pub fn roll_to_epm_unsigned() {
 		ElectionProviderMultiPhase::current_phase(),
 		pallet_election_provider_multi_phase::Phase::Unsigned(_)
 	) {
-		roll_to(System::block_number() + 1);
+		roll_to(System::block_number() + 1, false);
 	}
 }
 
@@ -634,10 +655,20 @@ pub fn roll_to_epm_off() {
 		ElectionProviderMultiPhase::current_phase(),
 		pallet_election_provider_multi_phase::Phase::Off
 	) {
-		roll_to(System::block_number() + 1);
+		roll_to(System::block_number() + 1, false);
 	}
 }
 
+// Queue a solution based on the current snapshot.
+pub(crate) fn try_queue_solution(when: ElectionCompute) -> Result<(), ()> {
+	let raw_solution = ElectionProviderMultiPhase::mine_solution().map_err(|_| ())?;
+	ElectionProviderMultiPhase::feasibility_check(raw_solution.0, when)
+		.map(|ready| {
+			QueuedSolution::<Runtime>::put(ready);
+		})
+		.map_err(|_| ())
+}
+
 pub(crate) fn on_offence_now(
 	offenders: &[OffenceDetails<
 		AccountId,

From 869b6775d23ef8f98f8ff5bba79d6e7aac11d5a2 Mon Sep 17 00:00:00 2001
From: gpestana <g6pestana@gmail.com>
Date: Fri, 6 Jan 2023 18:49:20 +0100
Subject: [PATCH 07/22] slash_through_offending_threshold

---
 .../test-election-provider/src/lib.rs          | 13 +++++++++----
 .../test-election-provider/src/mock.rs         | 18 +++++++++++++++++-
 2 files changed, 26 insertions(+), 5 deletions(-)

diff --git a/frame/election-provider-multi-phase/test-election-provider/src/lib.rs b/frame/election-provider-multi-phase/test-election-provider/src/lib.rs
index 160dffdbda4d5..1ff36e103d01b 100644
--- a/frame/election-provider-multi-phase/test-election-provider/src/lib.rs
+++ b/frame/election-provider-multi-phase/test-election-provider/src/lib.rs
@@ -55,8 +55,13 @@ fn setup_works() {
 
 		start_next_active_era();
 		start_next_active_era();
-		start_next_active_era();
-		start_next_active_era();
+		assert_eq!(active_era(), 2);
+
+		// if the solution is delayed, EPM will end up in emergency mode and eras won't progress.
+		start_next_active_era_delayed_solution();
+		start_next_active_era_delayed_solution();
+		assert!(ElectionProviderMultiPhase::current_phase().is_emergency());
+		assert_eq!(active_era(), 3);
 	});
 }
 
@@ -88,8 +93,8 @@ fn enters_emergency_phase_after_forcing_before_elect() {
 		log_current_time();
 
 		assert_eq!(pallet_staking::ForceEra::<Runtime>::get(), pallet_staking::Forcing::NotForcing);
-		// slashes until staking gets into `Forcing::ForceNew`.
-		add_slash(&11);
+		// slashes so that staking goes into `Forcing::ForceNew`.
+		slash_through_offending_threshold();
 
 		assert_eq!(pallet_staking::ForceEra::<Runtime>::get(), pallet_staking::Forcing::ForceNew);
 
diff --git a/frame/election-provider-multi-phase/test-election-provider/src/mock.rs b/frame/election-provider-multi-phase/test-election-provider/src/mock.rs
index 337b246d1040d..863d80bcbdd6f 100644
--- a/frame/election-provider-multi-phase/test-election-provider/src/mock.rs
+++ b/frame/election-provider-multi-phase/test-election-provider/src/mock.rs
@@ -548,7 +548,7 @@ pub fn roll_to(n: BlockNumber, delay_solution: bool) {
 		Timestamp::set_timestamp(System::block_number() * BLOCK_TIME + INIT_TIMESTAMP);
 
 		// if EPM is in off phase, there's no solution and the solution should not be delayed, try
-		// minining and queue a solution.
+		// "minining" and queue a solution.
 		if ElectionProviderMultiPhase::snapshot().is_none() &&
 			ElectionProviderMultiPhase::current_phase().is_off() &&
 			!delay_solution
@@ -685,6 +685,7 @@ pub(crate) fn on_offence_now(
 	);
 }
 
+// Add offence to validator, slash it.
 pub(crate) fn add_slash(who: &AccountId) {
 	on_offence_now(
 		&[OffenceDetails {
@@ -694,3 +695,18 @@ pub(crate) fn add_slash(who: &AccountId) {
 		&[Perbill::from_percent(10)],
 	);
 }
+
+// Slashes enough validators to cross the `Staking::OffendingValidatorsThreshold`.
+pub(crate) fn slash_through_offending_threshold() {
+	let validators = Session::validators();
+	let mut remaining_slashes =
+		<Runtime as pallet_staking::Config>::OffendingValidatorsThreshold::get() *
+			validators.len() as u32;
+
+	for v in validators.into_iter() {
+		if remaining_slashes != 0 {
+			add_slash(&v);
+			remaining_slashes -= 1;
+		}
+	}
+}

From eeb0438924e96a16ebe37d516f942421a339d47c Mon Sep 17 00:00:00 2001
From: gpestana <g6pestana@gmail.com>
Date: Mon, 9 Jan 2023 00:52:49 +0100
Subject: [PATCH 08/22] Renames e2e integration tests dir and crate

---
 .../Cargo.lock                                | 50 +++++++++----------
 .../Cargo.toml                                |  2 +-
 .../src/lib.rs                                |  0
 .../src/mock.rs                               |  0
 4 files changed, 26 insertions(+), 26 deletions(-)
 rename frame/election-provider-multi-phase/{test-election-provider => test-staking-e2e}/Cargo.lock (99%)
 rename frame/election-provider-multi-phase/{test-election-provider => test-staking-e2e}/Cargo.toml (97%)
 rename frame/election-provider-multi-phase/{test-election-provider => test-staking-e2e}/src/lib.rs (100%)
 rename frame/election-provider-multi-phase/{test-election-provider => test-staking-e2e}/src/mock.rs (100%)

diff --git a/frame/election-provider-multi-phase/test-election-provider/Cargo.lock b/frame/election-provider-multi-phase/test-staking-e2e/Cargo.lock
similarity index 99%
rename from frame/election-provider-multi-phase/test-election-provider/Cargo.lock
rename to frame/election-provider-multi-phase/test-staking-e2e/Cargo.lock
index 15d6f29c68e97..a17ce1bb0d357 100644
--- a/frame/election-provider-multi-phase/test-election-provider/Cargo.lock
+++ b/frame/election-provider-multi-phase/test-staking-e2e/Cargo.lock
@@ -1588,63 +1588,63 @@ dependencies = [
 ]
 
 [[package]]
-name = "pallet-election-provider-multi-phase"
-version = "4.0.0-dev"
+name = "pallet-election-provider-e2e-test"
+version = "1.0.0"
 dependencies = [
- "frame-benchmarking",
  "frame-election-provider-support",
  "frame-support",
  "frame-system",
  "log",
- "pallet-election-provider-support-benchmarking",
+ "pallet-bags-list",
+ "pallet-balances",
+ "pallet-election-provider-multi-phase",
+ "pallet-session",
+ "pallet-staking",
+ "pallet-timestamp",
  "parity-scale-codec",
- "rand 0.7.3",
  "scale-info",
- "sp-arithmetic",
  "sp-core",
  "sp-io",
  "sp-npos-elections",
  "sp-runtime",
+ "sp-staking",
  "sp-std",
- "static_assertions",
- "strum",
+ "sp-tracing",
 ]
 
 [[package]]
-name = "pallet-election-provider-support-benchmarking"
+name = "pallet-election-provider-multi-phase"
 version = "4.0.0-dev"
 dependencies = [
  "frame-benchmarking",
  "frame-election-provider-support",
+ "frame-support",
  "frame-system",
+ "log",
+ "pallet-election-provider-support-benchmarking",
  "parity-scale-codec",
+ "rand 0.7.3",
+ "scale-info",
+ "sp-arithmetic",
+ "sp-core",
+ "sp-io",
  "sp-npos-elections",
  "sp-runtime",
+ "sp-std",
+ "static_assertions",
+ "strum",
 ]
 
 [[package]]
-name = "pallet-election-provider-test"
-version = "1.0.0"
+name = "pallet-election-provider-support-benchmarking"
+version = "4.0.0-dev"
 dependencies = [
+ "frame-benchmarking",
  "frame-election-provider-support",
- "frame-support",
  "frame-system",
- "log",
- "pallet-bags-list",
- "pallet-balances",
- "pallet-election-provider-multi-phase",
- "pallet-session",
- "pallet-staking",
- "pallet-timestamp",
  "parity-scale-codec",
- "scale-info",
- "sp-core",
- "sp-io",
  "sp-npos-elections",
  "sp-runtime",
- "sp-staking",
- "sp-std",
- "sp-tracing",
 ]
 
 [[package]]
diff --git a/frame/election-provider-multi-phase/test-election-provider/Cargo.toml b/frame/election-provider-multi-phase/test-staking-e2e/Cargo.toml
similarity index 97%
rename from frame/election-provider-multi-phase/test-election-provider/Cargo.toml
rename to frame/election-provider-multi-phase/test-staking-e2e/Cargo.toml
index 477eae5d57413..432b732b48e9d 100644
--- a/frame/election-provider-multi-phase/test-election-provider/Cargo.toml
+++ b/frame/election-provider-multi-phase/test-staking-e2e/Cargo.toml
@@ -1,5 +1,5 @@
 [package]
-name = "pallet-election-provider-test"
+name = "pallet-election-provider-e2e-test"
 version = "1.0.0"
 authors = ["Parity Technologies <admin@parity.io>"]
 edition = "2021"
diff --git a/frame/election-provider-multi-phase/test-election-provider/src/lib.rs b/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
similarity index 100%
rename from frame/election-provider-multi-phase/test-election-provider/src/lib.rs
rename to frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
diff --git a/frame/election-provider-multi-phase/test-election-provider/src/mock.rs b/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
similarity index 100%
rename from frame/election-provider-multi-phase/test-election-provider/src/mock.rs
rename to frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs

From 888fa741a34efaef3d9b88e1faca136f687f5134 Mon Sep 17 00:00:00 2001
From: gpestana <g6pestana@gmail.com>
Date: Mon, 9 Jan 2023 02:34:39 +0100
Subject: [PATCH 09/22] consistently slash 10% of validator set

---
 .../test-staking-e2e/src/lib.rs               | 48 ++++++++-----------
 .../test-staking-e2e/src/mock.rs              | 17 +++++++
 2 files changed, 38 insertions(+), 27 deletions(-)

diff --git a/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs b/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
index 1ff36e103d01b..09c45f16fd518 100644
--- a/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
+++ b/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
@@ -22,6 +22,7 @@ pub(crate) const LOG_TARGET: &str = "tests::epm";
 
 use mock::*;
 use sp_npos_elections::{to_supports, StakedAssignment};
+use sp_runtime::Perbill;
 
 use crate::mock::RuntimeOrigin;
 
@@ -141,32 +142,25 @@ fn continous_slashes() {
 		.validator_count(10)
 		.build_and_execute(|| {
 			assert_eq!(Session::validators().len(), 10);
-
-			roll_to_epm_off();
-			assert!(ElectionProviderMultiPhase::current_phase().is_off());
-
-			println!(
-				"slashing 11, set: {:?} - {:?}",
-				Session::validators(),
-				ElectionProviderMultiPhase::current_phase()
-			);
-			add_slash(&11);
-			start_next_active_era();
-			assert_eq!(
-				pallet_staking::ForceEra::<Runtime>::get(),
-				pallet_staking::Forcing::NotForcing
-			);
-
-			println!(
-				"slashing 12, set: {:?} - {:?}",
-				Session::validators(),
-				ElectionProviderMultiPhase::current_phase()
-			);
-			add_slash(&12);
-			start_next_active_era();
-			assert_eq!(
-				pallet_staking::ForceEra::<Runtime>::get(),
-				pallet_staking::Forcing::NotForcing
-			);
+			let mut active_validator_set = Session::validators();
+
+			// slash 10% of the active validators and progress era.
+			while active_validator_set.len() != 0 {
+				let slashed = slash_percentage(Perbill::from_percent(10));
+				assert_eq!(slashed.len(), 1);
+				start_next_active_era();
+
+				let _ = slashed
+					.iter()
+					.map(|s| active_validator_set.retain(|x| x != s))
+					.collect::<Vec<_>>();
+
+				log!(
+					trace,
+					"slashed 10% of active validators ({:?}). After slash: {:?}",
+					slashed,
+					active_validator_set
+				);
+			}
 		});
 }
diff --git a/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs b/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
index 863d80bcbdd6f..f4bee90f19c76 100644
--- a/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
+++ b/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
@@ -710,3 +710,20 @@ pub(crate) fn slash_through_offending_threshold() {
 		}
 	}
 }
+
+// Slashes a percentage of the active nominators that haven't been slashed yet, with
+// a minimum of 1 validator slash.
+pub(crate) fn slash_percentage(percentage: Perbill) -> Vec<u128> {
+	let validators = Session::validators();
+	let mut remaining_slashes = (percentage * validators.len() as u32).max(1);
+	let mut slashed = vec![];
+
+	for v in validators.into_iter() {
+		if remaining_slashes != 0 {
+			add_slash(&v);
+			slashed.push(v);
+			remaining_slashes -= 1;
+		}
+	}
+	slashed
+}

From 8e735387f0f63c726e89f81e7d23e0412613b638 Mon Sep 17 00:00:00 2001
From: gpestana <g6pestana@gmail.com>
Date: Mon, 9 Jan 2023 12:47:38 +0100
Subject: [PATCH 10/22] finishes continous_slashes_below_offending_threshold
 test

---
 .../test-staking-e2e/src/lib.rs               | 45 ++++++++++++-------
 .../test-staking-e2e/src/mock.rs              | 30 ++++++++++---
 2 files changed, 53 insertions(+), 22 deletions(-)

diff --git a/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs b/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
index 09c45f16fd518..e7d71de6da7dc 100644
--- a/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
+++ b/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
@@ -54,13 +54,13 @@ fn setup_works() {
 	ExtBuilder::default().initialize_first_session(true).build_and_execute(|| {
 		assert_eq!(active_era(), 0);
 
-		start_next_active_era();
-		start_next_active_era();
+		assert!(start_next_active_era().is_ok());
+		assert!(start_next_active_era().is_ok());
 		assert_eq!(active_era(), 2);
 
 		// if the solution is delayed, EPM will end up in emergency mode and eras won't progress.
-		start_next_active_era_delayed_solution();
-		start_next_active_era_delayed_solution();
+		assert!(start_next_active_era_delayed_solution().is_ok());
+		assert!(start_next_active_era_delayed_solution().is_ok());
 		assert!(ElectionProviderMultiPhase::current_phase().is_emergency());
 		assert_eq!(active_era(), 3);
 	});
@@ -104,8 +104,8 @@ fn enters_emergency_phase_after_forcing_before_elect() {
 		log_current_time();
 
 		// try to advance 2 eras with a delayed solution.
-		start_next_active_era_delayed_solution();
-		start_next_active_era_delayed_solution();
+		assert!(start_next_active_era_delayed_solution().is_ok());
+		assert!(start_next_active_era_delayed_solution().is_ok());
 
 		// EPM is still in emergency phase.
 		assert!(ElectionProviderMultiPhase::current_phase().is_emergency());
@@ -135,8 +135,16 @@ fn enters_emergency_phase_after_forcing_before_elect() {
 }
 
 #[test]
-/// Continously slash 10% of the active validators per era, even during the emergency phase.
-fn continous_slashes() {
+/// Continously slash 10% of the active validators per era.
+///
+/// Since the `OffendingValidatorsThreshold` is only checked per era staking does not force a new
+/// era even as the number of active validators is decreasing across eras. When processing a new
+/// slash, staking calculates the offending threshold based on the lenght of the current list of
+/// active validators. Thus, slashing a percentage of the current validators that is lower than
+/// `OffendingValidatorsThreshold` will never force a new era. However, as the slashes progress, if
+/// the subsequent elections do not meet the minimum election untrusted score, the election will
+/// fail and enter in emenergency mode.
+fn continous_slashes_below_offending_threshold() {
 	ExtBuilder::default()
 		.initialize_first_session(true)
 		.validator_count(10)
@@ -144,16 +152,23 @@ fn continous_slashes() {
 			assert_eq!(Session::validators().len(), 10);
 			let mut active_validator_set = Session::validators();
 
-			// slash 10% of the active validators and progress era.
-			while active_validator_set.len() != 0 {
+			// set a minimum election score.
+			assert!(set_minimum_election_score(500, 1000, 500).is_ok());
+
+			// slash 10% of the active validators and progress era until the minimum trusted score
+			// is reached.
+			while active_validator_set.len() > 0 {
 				let slashed = slash_percentage(Perbill::from_percent(10));
 				assert_eq!(slashed.len(), 1);
-				start_next_active_era();
 
-				let _ = slashed
-					.iter()
-					.map(|s| active_validator_set.retain(|x| x != s))
-					.collect::<Vec<_>>();
+				// break loop when era does not progress; EPM is in emergency phase as election
+				// failed due to election minimum score.
+				if start_next_active_era().is_err() {
+					assert!(ElectionProviderMultiPhase::current_phase().is_emergency());
+					break
+				}
+
+				active_validator_set = Session::validators();
 
 				log!(
 					trace,
diff --git a/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs b/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
index f4bee90f19c76..62081f3a72853 100644
--- a/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
+++ b/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
@@ -17,6 +17,7 @@
 
 #![allow(dead_code)]
 
+use _feps::ExtendedBalance;
 use frame_support::{
 	parameter_types, traits,
 	traits::{GenesisBuild, Hooks},
@@ -24,7 +25,7 @@ use frame_support::{
 };
 use frame_system::EnsureRoot;
 use sp_core::{ConstU32, Get, H256};
-use sp_npos_elections::{BalancingConfig, VoteWeight};
+use sp_npos_elections::{BalancingConfig, ElectionScore, VoteWeight};
 use sp_runtime::{
 	testing,
 	traits::{IdentityLookup, Zero},
@@ -603,21 +604,22 @@ pub(crate) fn advance_session_delayed_solution() {
 }
 
 /// Progress until the given era.
-pub(crate) fn start_active_era(era_index: EraIndex, delay_solution: bool) {
+pub(crate) fn start_active_era(era_index: EraIndex, delay_solution: bool) -> Result<(), ()> {
 	start_session((era_index * <SessionsPerEra as Get<u32>>::get()).into(), delay_solution);
 
 	// if the solution was not delayed, era should have progressed.
-	if !delay_solution {
-		assert_eq!(active_era(), era_index);
-		assert_eq!(current_era(), active_era());
+	if !delay_solution && (active_era() != era_index || current_era() != active_era()) {
+		Err(())
+	} else {
+		Ok(())
 	}
 }
 
-pub(crate) fn start_next_active_era() {
+pub(crate) fn start_next_active_era() -> Result<(), ()> {
 	start_active_era(active_era() + 1, false)
 }
 
-pub(crate) fn start_next_active_era_delayed_solution() {
+pub(crate) fn start_next_active_era_delayed_solution() -> Result<(), ()> {
 	start_active_era(active_era() + 1, true)
 }
 
@@ -727,3 +729,17 @@ pub(crate) fn slash_percentage(percentage: Perbill) -> Vec<u128> {
 	}
 	slashed
 }
+
+pub(crate) fn set_minimum_election_score(
+	minimal_stake: ExtendedBalance,
+	sum_stake: ExtendedBalance,
+	sum_stake_squared: ExtendedBalance,
+) -> Result<(), ()> {
+	let election_score = ElectionScore { minimal_stake, sum_stake, sum_stake_squared };
+	ElectionProviderMultiPhase::set_minimum_untrusted_score(
+		RuntimeOrigin::root(),
+		Some(election_score),
+	)
+	.map(|_| ())
+	.map_err(|_| ())
+}

From 632e209ab79d2e5a9b5f288fae5306fde93c1a49 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gon=C3=A7alo=20Pestana?= <g6pestana@gmail.com>
Date: Mon, 13 Mar 2023 08:35:35 +0000
Subject: [PATCH 11/22] Update
 frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs

Co-authored-by: Ankan <10196091+Ank4n@users.noreply.github.com>
---
 frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs b/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
index e7d71de6da7dc..8092666707f1f 100644
--- a/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
+++ b/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
@@ -135,7 +135,7 @@ fn enters_emergency_phase_after_forcing_before_elect() {
 }
 
 #[test]
-/// Continously slash 10% of the active validators per era.
+/// Continuously slash 10% of the active validators per era.
 ///
 /// Since the `OffendingValidatorsThreshold` is only checked per era staking does not force a new
 /// era even as the number of active validators is decreasing across eras. When processing a new

From ffc9aaeaeef4756e2bcf29c9d0176e3b52469157 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gon=C3=A7alo=20Pestana?= <g6pestana@gmail.com>
Date: Mon, 13 Mar 2023 08:35:42 +0000
Subject: [PATCH 12/22] Update
 frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs

Co-authored-by: Ankan <10196091+Ank4n@users.noreply.github.com>
---
 frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs b/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
index 8092666707f1f..280e40b8e3ee9 100644
--- a/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
+++ b/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
@@ -139,7 +139,7 @@ fn enters_emergency_phase_after_forcing_before_elect() {
 ///
 /// Since the `OffendingValidatorsThreshold` is only checked per era staking does not force a new
 /// era even as the number of active validators is decreasing across eras. When processing a new
-/// slash, staking calculates the offending threshold based on the lenght of the current list of
+/// slash, staking calculates the offending threshold based on the length of the current list of
 /// active validators. Thus, slashing a percentage of the current validators that is lower than
 /// `OffendingValidatorsThreshold` will never force a new era. However, as the slashes progress, if
 /// the subsequent elections do not meet the minimum election untrusted score, the election will

From 81b2275405ab65ad08d0460db8ce436f03dc7020 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gon=C3=A7alo=20Pestana?= <g6pestana@gmail.com>
Date: Mon, 13 Mar 2023 13:41:51 +0000
Subject: [PATCH 13/22] Update
 frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
---
 frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs b/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
index 280e40b8e3ee9..3b4bd5934d3eb 100644
--- a/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
+++ b/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
@@ -1,6 +1,6 @@
 // This file is part of Substrate.
 
-// Copyright (C) 2022 Parity Technologies (UK) Ltd.
+// Copyright (C) Parity Technologies (UK) Ltd.
 // SPDX-License-Identifier: Apache-2.0
 
 // Licensed under the Apache License, Version 2.0 (the "License");

From b3c6e984cca12a833d57b79c8c4cd701ad95c925 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gon=C3=A7alo=20Pestana?= <g6pestana@gmail.com>
Date: Wed, 15 Mar 2023 05:09:30 +0000
Subject: [PATCH 14/22] Update
 frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
---
 .../test-staking-e2e/src/mock.rs                              | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs b/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
index 62081f3a72853..9edad997f98f7 100644
--- a/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
+++ b/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
@@ -299,8 +299,8 @@ where
 pub struct OnChainSeqPhragmen;
 
 parameter_types! {
-	pub VotersBound: u32 = 600;
-	pub TargetsBound: u32 = 400;
+	pub static VotersBound: u32 = 600;
+	pub static TargetsBound: u32 = 400;
 }
 
 impl onchain::Config for OnChainSeqPhragmen {

From a1dcd6c85471e9e04b8fc36c567b92630bd6bc6c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gon=C3=A7alo=20Pestana?= <g6pestana@gmail.com>
Date: Wed, 15 Mar 2023 05:10:08 +0000
Subject: [PATCH 15/22] Update
 frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
---
 .../election-provider-multi-phase/test-staking-e2e/src/mock.rs  | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs b/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
index 9edad997f98f7..0c29f4107398f 100644
--- a/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
+++ b/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
@@ -365,7 +365,7 @@ pub struct ExtBuilder {
 	invulnerables: Vec<AccountId>,
 	has_stakers: bool,
 	initialize_first_session: bool,
-	pub min_nominator_bond: Balance,
+	min_nominator_bond: Balance,
 	min_validator_bond: Balance,
 	balance_factor: Balance,
 	status: BTreeMap<AccountId, StakerStatus<AccountId>>,

From 79d8d4b1d9b28c2257e77ddfce6d44a2637cc6f2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gon=C3=A7alo=20Pestana?= <g6pestana@gmail.com>
Date: Wed, 15 Mar 2023 05:10:20 +0000
Subject: [PATCH 16/22] Update
 frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
---
 frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs | 1 -
 1 file changed, 1 deletion(-)

diff --git a/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs b/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
index 0c29f4107398f..c6727a197cd7e 100644
--- a/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
+++ b/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
@@ -391,7 +391,6 @@ impl Default for ExtBuilder {
 	}
 }
 
-parameter_types! {}
 
 impl ExtBuilder {
 	pub fn build(self) -> sp_io::TestExternalities {

From ac52c0b3bc6df2acaf55f5bea41d1176fb9c438e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gon=C3=A7alo=20Pestana?= <g6pestana@gmail.com>
Date: Wed, 15 Mar 2023 06:11:17 +0100
Subject: [PATCH 17/22] mock fixes

---
 .../test-staking-e2e/src/mock.rs                  | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs b/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
index c6727a197cd7e..2e4aca19ed849 100644
--- a/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
+++ b/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
@@ -25,7 +25,7 @@ use frame_support::{
 };
 use frame_system::EnsureRoot;
 use sp_core::{ConstU32, Get, H256};
-use sp_npos_elections::{BalancingConfig, ElectionScore, VoteWeight};
+use sp_npos_elections::{ElectionScore, VoteWeight};
 use sp_runtime::{
 	testing,
 	traits::{IdentityLookup, Zero},
@@ -127,10 +127,6 @@ impl pallet_balances::Config for Runtime {
 	type WeightInfo = ();
 }
 
-parameter_types! {
-	pub static CapturedMoment: Option<Moment> = None;
-}
-
 impl pallet_timestamp::Config for Runtime {
 	type Moment = Moment;
 	type OnTimestampSet = ();
@@ -181,9 +177,6 @@ parameter_types! {
 	pub static MaxElectingVoters: VoterIndex = 1000;
 	pub static MaxElectableTargets: TargetIndex = 1000;
 	pub static MaxActiveValidators: u32 = 1000;
-	pub static Balancing: Option<BalancingConfig> = Some( BalancingConfig { iterations: 0, tolerance: 0 } );
-	pub static BetterSignedThreshold: Perbill = Perbill::zero();
-	pub static BetterUnsignedThreshold: Perbill = Perbill::zero();
 	pub static OffchainRepeat: u32 = 5;
 	pub static MinerMaxLength: u32 = 256;
 	pub static MinerMaxWeight: Weight = BlockWeights::get().max_block;
@@ -199,8 +192,8 @@ impl pallet_election_provider_multi_phase::Config for Runtime {
 	type EstimateCallFee = frame_support::traits::ConstU32<8>;
 	type SignedPhase = SignedPhase;
 	type UnsignedPhase = UnsignedPhase;
-	type BetterSignedThreshold = BetterSignedThreshold;
-	type BetterUnsignedThreshold = BetterUnsignedThreshold;
+	type BetterSignedThreshold = ();
+	type BetterUnsignedThreshold = ();
 	type OffchainRepeat = OffchainRepeat;
 	type MinerTxPriority = TransactionPriority;
 	type MinerConfig = Self;
@@ -217,7 +210,7 @@ impl pallet_election_provider_multi_phase::Config for Runtime {
 	type Fallback =
 		frame_election_provider_support::NoElection<(AccountId, BlockNumber, Staking, MaxWinners)>;
 	type GovernanceFallback = onchain::OnChainExecution<OnChainSeqPhragmen>;
-	type Solver = SequentialPhragmen<AccountId, SolutionAccuracyOf<Runtime>, Balancing>;
+	type Solver = SequentialPhragmen<AccountId, SolutionAccuracyOf<Runtime>, ()>;
 	type ForceOrigin = EnsureRoot<AccountId>;
 	type MaxElectableTargets = MaxElectableTargets;
 	type MaxElectingVoters = MaxElectingVoters;

From 40ac80f5d510a8633733f58c99e1b9867e07862b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gon=C3=A7alo=20Pestana?= <g6pestana@gmail.com>
Date: Wed, 15 Mar 2023 06:25:40 +0100
Subject: [PATCH 18/22] Additional checks to delayed solution eras and mock
 fixes

---
 .../test-staking-e2e/src/lib.rs               |  8 +++--
 .../test-staking-e2e/src/mock.rs              | 31 ++++++++-----------
 2 files changed, 19 insertions(+), 20 deletions(-)

diff --git a/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs b/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
index 3b4bd5934d3eb..ef2208c3a5952 100644
--- a/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
+++ b/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
@@ -18,7 +18,7 @@
 #![cfg(test)]
 mod mock;
 
-pub(crate) const LOG_TARGET: &str = "tests::epm";
+pub(crate) const LOG_TARGET: &str = "tests::e2e-epm";
 
 use mock::*;
 use sp_npos_elections::{to_supports, StakedAssignment};
@@ -70,7 +70,7 @@ fn setup_works() {
 /// Replicates the Kusama incident of 8th Dec 2022 and its resolution through the governance
 /// fallback.
 ///
-/// After enough slashes to exceed the `Staking::OffendingValidatorsThreshold`, the staking pallet
+/// After enough slashes exceeded the `Staking::OffendingValidatorsThreshold`, the staking pallet
 /// set `Forcing::ForceNew`. When a new session starts, staking will start to force a new era and
 /// calls <EPM as election_provider>::elect(). If at this point EPM and the staking miners did not
 /// have enough time to queue a new solution (snapshot + solution submission), the election request
@@ -103,9 +103,12 @@ fn enters_emergency_phase_after_forcing_before_elect() {
 		assert!(ElectionProviderMultiPhase::current_phase().is_emergency());
 		log_current_time();
 
+		let era_before_delayed_next = Staking::current_era();
 		// try to advance 2 eras with a delayed solution.
 		assert!(start_next_active_era_delayed_solution().is_ok());
+		assert_eq!(Staking::current_era(), era_before_delayed_next);
 		assert!(start_next_active_era_delayed_solution().is_ok());
+		assert_eq!(Staking::current_era(), era_before_delayed_next);
 
 		// EPM is still in emergency phase.
 		assert!(ElectionProviderMultiPhase::current_phase().is_emergency());
@@ -131,6 +134,7 @@ fn enters_emergency_phase_after_forcing_before_elect() {
 		log_current_time();
 		assert!(ElectionProviderMultiPhase::current_phase().is_signed());
 		assert_eq!(Session::validators(), vec![21, 31, 41]);
+		assert_eq!(Staking::current_era(), era_before_delayed_next.map(|e| e + 1));
 	});
 }
 
diff --git a/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs b/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
index 2e4aca19ed849..9ee03a401ca80 100644
--- a/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
+++ b/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
@@ -215,7 +215,7 @@ impl pallet_election_provider_multi_phase::Config for Runtime {
 	type MaxElectableTargets = MaxElectableTargets;
 	type MaxElectingVoters = MaxElectingVoters;
 	type MaxWinners = MaxWinners;
-	type BenchmarkingConfig = ElectionProviderBenchmarkConfig;
+	type BenchmarkingConfig = NoopElectionProviderBenchmarkConfig;
 	type WeightInfo = ();
 }
 
@@ -278,7 +278,7 @@ impl pallet_staking::Config for Runtime {
 	type HistoryDepth = HistoryDepth;
 	type OnStakerSlash = ();
 	type WeightInfo = pallet_staking::weights::SubstrateWeight<Runtime>;
-	type BenchmarkingConfig = StakingBenchmarkingConfig;
+	type BenchmarkingConfig = pallet_staking::TestBenchmarkingConfig;
 }
 
 impl<LocalCall> frame_system::offchain::SendTransactionTypes<LocalCall> for Runtime
@@ -309,22 +309,18 @@ impl onchain::Config for OnChainSeqPhragmen {
 	type TargetsBound = TargetsBound;
 }
 
-pub struct StakingBenchmarkingConfig;
-impl pallet_staking::BenchmarkingConfig for StakingBenchmarkingConfig {
-	type MaxNominators = traits::ConstU32<1000>;
-	type MaxValidators = traits::ConstU32<1000>;
-}
-
-pub struct ElectionProviderBenchmarkConfig;
+pub struct NoopElectionProviderBenchmarkConfig;
 
-impl pallet_election_provider_multi_phase::BenchmarkingConfig for ElectionProviderBenchmarkConfig {
-	const VOTERS: [u32; 2] = [1000, 2000];
-	const TARGETS: [u32; 2] = [500, 1000];
-	const ACTIVE_VOTERS: [u32; 2] = [500, 800];
-	const DESIRED_TARGETS: [u32; 2] = [200, 400];
-	const SNAPSHOT_MAXIMUM_VOTERS: u32 = 1000;
-	const MINER_MAXIMUM_VOTERS: u32 = 1000;
-	const MAXIMUM_TARGETS: u32 = 300;
+impl pallet_election_provider_multi_phase::BenchmarkingConfig
+	for NoopElectionProviderBenchmarkConfig
+{
+	const VOTERS: [u32; 2] = [0, 0];
+	const TARGETS: [u32; 2] = [0, 0];
+	const ACTIVE_VOTERS: [u32; 2] = [0, 0];
+	const DESIRED_TARGETS: [u32; 2] = [0, 0];
+	const SNAPSHOT_MAXIMUM_VOTERS: u32 = 0;
+	const MINER_MAXIMUM_VOTERS: u32 = 0;
+	const MAXIMUM_TARGETS: u32 = 0;
 }
 
 pub struct OtherSessionHandler;
@@ -384,7 +380,6 @@ impl Default for ExtBuilder {
 	}
 }
 
-
 impl ExtBuilder {
 	pub fn build(self) -> sp_io::TestExternalities {
 		sp_tracing::try_init_simple();

From f1de0a937aaa996accbc0b87d1072dba06b70d6d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gon=C3=A7alo=20Pestana?= <g6pestana@gmail.com>
Date: Wed, 15 Mar 2023 08:38:13 +0100
Subject: [PATCH 19/22] nits and addresses review comments; splits ext_builder
 into one per pallet

---
 .../test-staking-e2e/src/lib.rs               |  67 +++--
 .../test-staking-e2e/src/mock.rs              | 274 ++++++++++--------
 2 files changed, 180 insertions(+), 161 deletions(-)

diff --git a/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs b/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
index ef2208c3a5952..ab5a164c64f49 100644
--- a/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
+++ b/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
@@ -51,7 +51,7 @@ fn log_current_time() {
 
 #[test]
 fn setup_works() {
-	ExtBuilder::default().initialize_first_session(true).build_and_execute(|| {
+	ExtBuilder::default().build_and_execute(|| {
 		assert_eq!(active_era(), 0);
 
 		assert!(start_next_active_era().is_ok());
@@ -81,7 +81,7 @@ fn setup_works() {
 /// solution is added to the queue, EPM phase transitions to `Phase::Off` and the election flow
 /// restarts.
 fn enters_emergency_phase_after_forcing_before_elect() {
-	ExtBuilder::default().initialize_first_session(true).build_and_execute(|| {
+	ExtBuilder::default().build_and_execute(|| {
 		log!(
 			trace,
 			"current validators (staking): {:?}",
@@ -149,37 +149,36 @@ fn enters_emergency_phase_after_forcing_before_elect() {
 /// the subsequent elections do not meet the minimum election untrusted score, the election will
 /// fail and enter in emenergency mode.
 fn continous_slashes_below_offending_threshold() {
-	ExtBuilder::default()
-		.initialize_first_session(true)
-		.validator_count(10)
-		.build_and_execute(|| {
-			assert_eq!(Session::validators().len(), 10);
-			let mut active_validator_set = Session::validators();
-
-			// set a minimum election score.
-			assert!(set_minimum_election_score(500, 1000, 500).is_ok());
-
-			// slash 10% of the active validators and progress era until the minimum trusted score
-			// is reached.
-			while active_validator_set.len() > 0 {
-				let slashed = slash_percentage(Perbill::from_percent(10));
-				assert_eq!(slashed.len(), 1);
-
-				// break loop when era does not progress; EPM is in emergency phase as election
-				// failed due to election minimum score.
-				if start_next_active_era().is_err() {
-					assert!(ElectionProviderMultiPhase::current_phase().is_emergency());
-					break
-				}
-
-				active_validator_set = Session::validators();
-
-				log!(
-					trace,
-					"slashed 10% of active validators ({:?}). After slash: {:?}",
-					slashed,
-					active_validator_set
-				);
+	let staking_builder = StakingExtBuilder::default().validator_count(10);
+
+	ExtBuilder::default().staking(staking_builder).build_and_execute(|| {
+		assert_eq!(Session::validators().len(), 10);
+		let mut active_validator_set = Session::validators();
+
+		// set a minimum election score.
+		assert!(set_minimum_election_score(500, 1000, 500).is_ok());
+
+		// slash 10% of the active validators and progress era until the minimum trusted score
+		// is reached.
+		while active_validator_set.len() > 0 {
+			let slashed = slash_percentage(Perbill::from_percent(10));
+			assert_eq!(slashed.len(), 1);
+
+			// break loop when era does not progress; EPM is in emergency phase as election
+			// failed due to election minimum score.
+			if start_next_active_era().is_err() {
+				assert!(ElectionProviderMultiPhase::current_phase().is_emergency());
+				break
 			}
-		});
+
+			active_validator_set = Session::validators();
+
+			log!(
+				trace,
+				"slashed 10% of active validators ({:?}). After slash: {:?}",
+				slashed,
+				active_validator_set
+			);
+		}
+	});
 }
diff --git a/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs b/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
index 9ee03a401ca80..db08bf8ef471f 100644
--- a/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
+++ b/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
@@ -149,11 +149,11 @@ impl pallet_session::Config for Runtime {
 	type SessionManager = pallet_session::historical::NoteHistoricalRoot<Runtime, Staking>;
 	type Keys = SessionKeys;
 	type ShouldEndSession = pallet_session::PeriodicSessions<Period, Offset>;
+	type NextSessionRotation = pallet_session::PeriodicSessions<Period, Offset>;
 	type SessionHandler = (OtherSessionHandler,);
 	type RuntimeEvent = RuntimeEvent;
 	type ValidatorId = AccountId;
 	type ValidatorIdOf = pallet_staking::StashOf<Runtime>;
-	type NextSessionRotation = pallet_session::PeriodicSessions<Period, Offset>;
 	type WeightInfo = ();
 }
 impl pallet_session::historical::Config for Runtime {
@@ -348,34 +348,126 @@ impl sp_runtime::BoundToRuntimeAppPublic for OtherSessionHandler {
 	type Public = testing::UintAuthorityId;
 }
 
-pub struct ExtBuilder {
+pub struct StakingExtBuilder {
 	validator_count: u32,
 	minimum_validator_count: u32,
-	invulnerables: Vec<AccountId>,
-	has_stakers: bool,
-	initialize_first_session: bool,
 	min_nominator_bond: Balance,
 	min_validator_bond: Balance,
-	balance_factor: Balance,
 	status: BTreeMap<AccountId, StakerStatus<AccountId>>,
 	stakes: BTreeMap<AccountId, Balance>,
 	stakers: Vec<(AccountId, AccountId, Balance, StakerStatus<AccountId>)>,
 }
 
-impl Default for ExtBuilder {
+impl Default for StakingExtBuilder {
 	fn default() -> Self {
+		let stakers = vec![
+			// (stash, ctrl, stake, status)
+			// these two will be elected in the default test where we elect 2.
+			(11, 10, 1000, StakerStatus::<AccountId>::Validator),
+			(21, 20, 1000, StakerStatus::<AccountId>::Validator),
+			// loser validatos if validator_count() is default.
+			(31, 30, 500, StakerStatus::<AccountId>::Validator),
+			(41, 40, 500, StakerStatus::<AccountId>::Validator),
+			(51, 50, 500, StakerStatus::<AccountId>::Validator),
+			(61, 60, 500, StakerStatus::<AccountId>::Validator),
+			(71, 70, 500, StakerStatus::<AccountId>::Validator),
+			(81, 80, 500, StakerStatus::<AccountId>::Validator),
+			(91, 90, 500, StakerStatus::<AccountId>::Validator),
+			(101, 100, 500, StakerStatus::<AccountId>::Validator),
+			// an idle validator
+			(201, 200, 1000, StakerStatus::<AccountId>::Idle),
+		];
+
 		Self {
 			validator_count: 2,
 			minimum_validator_count: 0,
-			balance_factor: 1,
-			invulnerables: vec![],
-			has_stakers: true,
-			initialize_first_session: true,
 			min_nominator_bond: ExistentialDeposit::get(),
 			min_validator_bond: ExistentialDeposit::get(),
 			status: Default::default(),
 			stakes: Default::default(),
-			stakers: Default::default(),
+			stakers,
+		}
+	}
+}
+
+impl StakingExtBuilder {
+	pub fn validator_count(mut self, n: u32) -> Self {
+		self.validator_count = n;
+		self
+	}
+}
+
+pub struct EpmExtBuilder {}
+
+impl Default for EpmExtBuilder {
+	fn default() -> Self {
+		EpmExtBuilder {}
+	}
+}
+
+impl EpmExtBuilder {
+	pub fn phases(self, signed: BlockNumber, unsigned: BlockNumber) -> Self {
+		<SignedPhase>::set(signed);
+		<UnsignedPhase>::set(unsigned);
+		self
+	}
+}
+
+struct BalancesExtBuilder {
+	balances: Vec<(AccountId, Balance)>,
+}
+
+impl Default for BalancesExtBuilder {
+	fn default() -> Self {
+		let balances = vec![
+			// (account_id, balance)
+			(1, 10),
+			(2, 20),
+			(3, 300),
+			(4, 400),
+			// controllers
+			(10, 100),
+			(20, 100),
+			(30, 100),
+			(40, 100),
+			(50, 100),
+			(60, 100),
+			(70, 100),
+			(80, 100),
+			(90, 100),
+			(100, 100),
+			(200, 100),
+			// stashes
+			(11, 1000),
+			(21, 2000),
+			(31, 3000),
+			(41, 4000),
+			(51, 5000),
+			(61, 6000),
+			(71, 7000),
+			(81, 8000),
+			(91, 9000),
+			(101, 10000),
+			(201, 20000),
+			// This allows us to have a total_payout different from 0.
+			(999, 1_000_000_000_000),
+		];
+		Self { balances }
+	}
+}
+
+pub struct ExtBuilder {
+	staking_builder: StakingExtBuilder,
+	epm_builder: EpmExtBuilder,
+	balances_builder: BalancesExtBuilder,
+}
+
+impl Default for ExtBuilder {
+	fn default() -> Self {
+		Self {
+			staking_builder: StakingExtBuilder::default(),
+			epm_builder: EpmExtBuilder::default(),
+			balances_builder: BalancesExtBuilder::default(),
 		}
 	}
 }
@@ -386,142 +478,70 @@ impl ExtBuilder {
 		let mut storage =
 			frame_system::GenesisConfig::default().build_storage::<Runtime>().unwrap();
 
-		let _ = pallet_balances::GenesisConfig::<Runtime> {
-			balances: vec![
-				(1, 10 * self.balance_factor),
-				(2, 20 * self.balance_factor),
-				(3, 300 * self.balance_factor),
-				(4, 400 * self.balance_factor),
-				// controllers
-				(10, self.balance_factor),
-				(20, self.balance_factor),
-				(30, self.balance_factor),
-				(40, self.balance_factor),
-				(50, self.balance_factor),
-				(60, self.balance_factor),
-				(70, self.balance_factor),
-				(80, self.balance_factor),
-				(90, self.balance_factor),
-				(100, self.balance_factor),
-				(200, self.balance_factor),
-				// stashes
-				(11, self.balance_factor * 1000),
-				(21, self.balance_factor * 2000),
-				(31, self.balance_factor * 3000),
-				(41, self.balance_factor * 4000),
-				(51, self.balance_factor * 5000),
-				(61, self.balance_factor * 6000),
-				(71, self.balance_factor * 7000),
-				(81, self.balance_factor * 8000),
-				(91, self.balance_factor * 9000),
-				(101, self.balance_factor * 10000),
-				(201, self.balance_factor * 20000),
-				// This allows us to have a total_payout different from 0.
-				(999, 1_000_000_000_000),
-			],
-		}
-		.assimilate_storage(&mut storage);
-
-		let mut stakers = vec![];
-		if self.has_stakers {
-			stakers = vec![
-				// (stash, ctrl, stake, status)
-				// these two will be elected in the default test where we elect 2.
-				(11, 10, self.balance_factor * 1000, StakerStatus::<AccountId>::Validator),
-				(21, 20, self.balance_factor * 1000, StakerStatus::<AccountId>::Validator),
-				// loser validatos if validator_count() is default.
-				(31, 30, self.balance_factor * 500, StakerStatus::<AccountId>::Validator),
-				(41, 40, self.balance_factor * 500, StakerStatus::<AccountId>::Validator),
-				(51, 50, self.balance_factor * 500, StakerStatus::<AccountId>::Validator),
-				(61, 60, self.balance_factor * 500, StakerStatus::<AccountId>::Validator),
-				(71, 70, self.balance_factor * 500, StakerStatus::<AccountId>::Validator),
-				(81, 80, self.balance_factor * 500, StakerStatus::<AccountId>::Validator),
-				(91, 90, self.balance_factor * 500, StakerStatus::<AccountId>::Validator),
-				(101, 100, self.balance_factor * 500, StakerStatus::<AccountId>::Validator),
-				// an idle validator
-				(201, 200, self.balance_factor * 1000, StakerStatus::<AccountId>::Idle),
-			];
-			// replace any of the status if needed.
-			self.status.into_iter().for_each(|(stash, status)| {
-				let (_, _, _, ref mut prev_status) = stakers
-					.iter_mut()
-					.find(|s| s.0 == stash)
-					.expect("set_status staker should exist; qed");
-				*prev_status = status;
-			});
-			// replaced any of the stakes if needed.
-			self.stakes.into_iter().for_each(|(stash, stake)| {
-				let (_, _, ref mut prev_stake, _) = stakers
-					.iter_mut()
-					.find(|s| s.0 == stash)
-					.expect("set_stake staker should exits; qed.");
-				*prev_stake = stake;
-			});
-			// extend stakers if needed.
-			stakers.extend(self.stakers)
-		}
+		let _ =
+			pallet_balances::GenesisConfig::<Runtime> { balances: self.balances_builder.balances }
+				.assimilate_storage(&mut storage);
+
+		let mut stakers = self.staking_builder.stakers.clone();
+		self.staking_builder.status.into_iter().for_each(|(stash, status)| {
+			let (_, _, _, ref mut prev_status) = stakers
+				.iter_mut()
+				.find(|s| s.0 == stash)
+				.expect("set_status staker should exist; qed");
+			*prev_status = status;
+		});
+		// replaced any of the stakes if needed.
+		self.staking_builder.stakes.into_iter().for_each(|(stash, stake)| {
+			let (_, _, ref mut prev_stake, _) = stakers
+				.iter_mut()
+				.find(|s| s.0 == stash)
+				.expect("set_stake staker should exits; qed.");
+			*prev_stake = stake;
+		});
 
 		let _ = pallet_staking::GenesisConfig::<Runtime> {
 			stakers: stakers.clone(),
-			validator_count: self.validator_count,
-			minimum_validator_count: self.minimum_validator_count,
-			invulnerables: self.invulnerables,
+			validator_count: self.staking_builder.validator_count,
+			minimum_validator_count: self.staking_builder.minimum_validator_count,
 			slash_reward_fraction: Perbill::from_percent(10),
-			min_nominator_bond: self.min_nominator_bond,
-			min_validator_bond: self.min_validator_bond,
+			min_nominator_bond: self.staking_builder.min_nominator_bond,
+			min_validator_bond: self.staking_builder.min_validator_bond,
 			..Default::default()
 		}
 		.assimilate_storage(&mut storage);
 
 		let _ = pallet_session::GenesisConfig::<Runtime> {
-			keys: if self.has_stakers {
-				// set the keys for the first session.
-				stakers
-					.into_iter()
-					.map(|(id, ..)| (id, id, SessionKeys { other: (id as u64).into() }))
-					.collect()
-			} else {
-				// set some dummy validators in genesis.
-				(0..self.validator_count as u128)
-					.map(|id| (id, id, SessionKeys { other: (id as u64).into() }))
-					.collect()
-			},
+			// set the keys for the first session.
+			keys: stakers
+				.into_iter()
+				.map(|(id, ..)| (id, id, SessionKeys { other: (id as u64).into() }))
+				.collect(),
 		}
 		.assimilate_storage(&mut storage);
 
 		let mut ext = sp_io::TestExternalities::from(storage);
 
-		if self.initialize_first_session {
-			// We consider all test to start after timestamp is initialized This must be ensured by
-			// having `timestamp::on_initialize` called before `staking::on_initialize`. Also, if
-			// session length is 1, then it is already triggered.
-			ext.execute_with(|| {
-				System::set_block_number(1);
-				Session::on_initialize(1);
-				<Staking as Hooks<u64>>::on_initialize(1);
-				Timestamp::set_timestamp(INIT_TIMESTAMP);
-			});
-		}
+		// We consider all test to start after timestamp is initialized This must be ensured by
+		// having `timestamp::on_initialize` called before `staking::on_initialize`.
+		ext.execute_with(|| {
+			System::set_block_number(1);
+			Session::on_initialize(1);
+			<Staking as Hooks<u64>>::on_initialize(1);
+			Timestamp::set_timestamp(INIT_TIMESTAMP);
+		});
 
 		ext
 	}
-	pub fn balance_factor(mut self, factor: Balance) -> Self {
-		self.balance_factor = factor;
-		self
-	}
-	pub fn initialize_first_session(mut self, init: bool) -> Self {
-		self.initialize_first_session = init;
+	pub fn staking(mut self, builder: StakingExtBuilder) -> Self {
+		self.staking_builder = builder;
 		self
 	}
-	pub fn phases(self, signed: BlockNumber, unsigned: BlockNumber) -> Self {
-		<SignedPhase>::set(signed);
-		<UnsignedPhase>::set(unsigned);
-		self
-	}
-	pub fn validator_count(mut self, n: u32) -> Self {
-		self.validator_count = n;
+
+	pub fn epm(mut self, builder: EpmExtBuilder) -> Self {
+		self.epm_builder = builder;
 		self
 	}
+
 	pub fn build_and_execute(self, test: impl FnOnce() -> ()) {
 		self.build().execute_with(test)
 	}

From 84dfba6915ebacc509d44debf8fdc4e693862981 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gon=C3=A7alo=20Pestana?= <g6pestana@gmail.com>
Date: Wed, 15 Mar 2023 08:43:28 +0100
Subject: [PATCH 20/22] helper to set balances ext builder

---
 .../test-staking-e2e/src/mock.rs                           | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs b/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
index db08bf8ef471f..054aea1a061dc 100644
--- a/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
+++ b/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
@@ -413,7 +413,7 @@ impl EpmExtBuilder {
 	}
 }
 
-struct BalancesExtBuilder {
+pub struct BalancesExtBuilder {
 	balances: Vec<(AccountId, Balance)>,
 }
 
@@ -542,6 +542,11 @@ impl ExtBuilder {
 		self
 	}
 
+	pub fn balances(mut self, builder: BalancesExtBuilder) -> Self {
+		self.balances_builder = builder;
+		self
+	}
+
 	pub fn build_and_execute(self, test: impl FnOnce() -> ()) {
 		self.build().execute_with(test)
 	}

From 9829cc13fc374a0aa0600a18e491a70919328d9d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gon=C3=A7alo=20Pestana?= <g6pestana@gmail.com>
Date: Wed, 15 Mar 2023 10:01:39 +0100
Subject: [PATCH 21/22] bring up mock.rs to master

---
 .../test-staking-e2e/Cargo.lock               | 522 +++++++++++-------
 .../test-staking-e2e/src/mock.rs              |   8 +-
 2 files changed, 317 insertions(+), 213 deletions(-)

diff --git a/frame/election-provider-multi-phase/test-staking-e2e/Cargo.lock b/frame/election-provider-multi-phase/test-staking-e2e/Cargo.lock
index a17ce1bb0d357..b179ab7059a48 100644
--- a/frame/election-provider-multi-phase/test-staking-e2e/Cargo.lock
+++ b/frame/election-provider-multi-phase/test-staking-e2e/Cargo.lock
@@ -38,6 +38,18 @@ dependencies = [
  "version_check",
 ]
 
+[[package]]
+name = "ahash"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2c99f64d1e06488f620f932677e24bc6e2897582980441ae90a671415bd7ec2f"
+dependencies = [
+ "cfg-if",
+ "getrandom 0.2.8",
+ "once_cell",
+ "version_check",
+]
+
 [[package]]
 name = "aho-corasick"
 version = "0.7.20"
@@ -67,9 +79,9 @@ dependencies = [
 
 [[package]]
 name = "anyhow"
-version = "1.0.66"
+version = "1.0.69"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "216261ddc8289130e551ddcd5ce8a064710c0d064a4d2895c67151c92b5443f6"
+checksum = "224afbd727c3d6e4b90103ece64b8d1b67fbb1973b1046c2281eed3f3803f800"
 
 [[package]]
 name = "approx"
@@ -196,6 +208,17 @@ dependencies = [
  "digest 0.10.6",
 ]
 
+[[package]]
+name = "blake2b_simd"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3c2f0dc9a68c6317d884f97cc36cf5a3d20ba14ce404227df55e1af708ab04bc"
+dependencies = [
+ "arrayref",
+ "arrayvec 0.7.2",
+ "constant_time_eq",
+]
+
 [[package]]
 name = "block-buffer"
 version = "0.7.3"
@@ -235,6 +258,18 @@ dependencies = [
  "byte-tools",
 ]
 
+[[package]]
+name = "bounded-collections"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a071c348a5ef6da1d3a87166b408170b46002382b1dda83992b5c2208cefb370"
+dependencies = [
+ "log",
+ "parity-scale-codec",
+ "scale-info",
+ "serde",
+]
+
 [[package]]
 name = "bumpalo"
 version = "3.11.1"
@@ -253,6 +288,12 @@ version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e3b5ca7a04898ad4bcd41c90c5285445ff5b791899bb1b0abdd2a2aa791211d7"
 
+[[package]]
+name = "bytemuck"
+version = "1.13.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "17febce684fd15d89027105661fec94afb475cb995fbc59d2865198446ba2eea"
+
 [[package]]
 name = "byteorder"
 version = "1.4.3"
@@ -314,6 +355,12 @@ version = "0.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cec318a675afcb6a1ea1d4340e2d377e56e47c266f28043ceccbf4412ddfdd3b"
 
+[[package]]
+name = "constant_time_eq"
+version = "0.2.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "13418e745008f7349ec7e449155f419a61b92b58a99cc3616942b926825ec76b"
+
 [[package]]
 name = "core-foundation-sys"
 version = "0.8.3"
@@ -340,9 +387,9 @@ dependencies = [
 
 [[package]]
 name = "cranelift-entity"
-version = "0.88.2"
+version = "0.93.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "87a0f1b2fdc18776956370cf8d9b009ded3f855350c480c1c52142510961f352"
+checksum = "7cf583f7b093f291005f9fb1323e2c37f6ee4c7909e39ce016b2e8360d461705"
 dependencies = [
  "serde",
 ]
@@ -484,6 +531,17 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "derive-syn-parse"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e79116f119dd1dba1abf1f3405f03b9b0e79a27a3883864bfebded8a3dc768cd"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "derive_more"
 version = "0.99.17"
@@ -597,7 +655,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7c24f403d068ad0b359e577a77f92392118be3f3c927538f2bb544a5ecd828c6"
 dependencies = [
  "curve25519-dalek 3.2.0",
- "hashbrown",
+ "hashbrown 0.12.3",
  "hex",
  "rand_core 0.6.4",
  "sha2 0.9.9",
@@ -656,6 +714,19 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "expander"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f360349150728553f92e4c997a16af8915f418d3a0f21b440d34c5632f16ed84"
+dependencies = [
+ "blake2",
+ "fs-err",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "fake-simd"
 version = "0.1.2"
@@ -690,11 +761,21 @@ dependencies = [
  "static_assertions",
 ]
 
+[[package]]
+name = "form_urlencoded"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a9c384f161156f5260c24a097c56119f9be8c798586aecc13afbcbe7b7e26bf8"
+dependencies = [
+ "percent-encoding",
+]
+
 [[package]]
 name = "frame-benchmarking"
 version = "4.0.0-dev"
 dependencies = [
  "frame-support",
+ "frame-support-procedural",
  "frame-system",
  "linregress",
  "log",
@@ -710,6 +791,7 @@ dependencies = [
  "sp-runtime-interface",
  "sp-std",
  "sp-storage",
+ "static_assertions",
 ]
 
 [[package]]
@@ -732,6 +814,7 @@ dependencies = [
  "parity-scale-codec",
  "scale-info",
  "sp-arithmetic",
+ "sp-core",
  "sp-npos-elections",
  "sp-runtime",
  "sp-std",
@@ -754,6 +837,7 @@ name = "frame-support"
 version = "4.0.0-dev"
 dependencies = [
  "bitflags",
+ "environmental",
  "frame-metadata",
  "frame-support-procedural",
  "impl-trait-for-tuples",
@@ -786,6 +870,7 @@ version = "4.0.0-dev"
 dependencies = [
  "Inflector",
  "cfg-expr",
+ "derive-syn-parse",
  "frame-support-procedural-tools",
  "itertools",
  "proc-macro2",
@@ -830,6 +915,12 @@ dependencies = [
  "sp-weights",
 ]
 
+[[package]]
+name = "fs-err"
+version = "2.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0845fa252299212f0389d64ba26f34fa32cfe41588355f21ed507c59a0f64541"
+
 [[package]]
 name = "funty"
 version = "2.0.0"
@@ -958,10 +1049,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
 dependencies = [
  "cfg-if",
- "js-sys",
  "libc",
  "wasi 0.9.0+wasi-snapshot-preview1",
- "wasm-bindgen",
 ]
 
 [[package]]
@@ -998,9 +1087,9 @@ dependencies = [
 
 [[package]]
 name = "hash-db"
-version = "0.15.2"
+version = "0.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d23bd4e7b5eda0d0f3a307e8b381fdc8ba9000f26fbe912250c0a4cc3956364a"
+checksum = "8e7d7786361d7425ae2fe4f9e407eb0efaa0840f5212d109cc018c40c35c6ab4"
 
 [[package]]
 name = "hash256-std-hasher"
@@ -1017,7 +1106,16 @@ version = "0.12.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
 dependencies = [
- "ahash",
+ "ahash 0.7.6",
+]
+
+[[package]]
+name = "hashbrown"
+version = "0.13.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "43a3c133739dddd0d2990f9a4bdf8eb4b21ef50e4851ca85ab661199821d510e"
+dependencies = [
+ "ahash 0.8.3",
 ]
 
 [[package]]
@@ -1105,6 +1203,16 @@ dependencies = [
  "cxx-build",
 ]
 
+[[package]]
+name = "idna"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e14ddfc70884202db2244c223200c204c2bda1bc6e0998d11b5e024d657209e6"
+dependencies = [
+ "unicode-bidi",
+ "unicode-normalization",
+]
+
 [[package]]
 name = "impl-codec"
 version = "0.6.0"
@@ -1141,7 +1249,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1885e79c1fc4b10f0e172c475f458b7f7b93061064d98c3293e98c5ba0c8b399"
 dependencies = [
  "autocfg",
- "hashbrown",
+ "hashbrown 0.12.3",
  "serde",
 ]
 
@@ -1156,9 +1264,13 @@ dependencies = [
 
 [[package]]
 name = "io-lifetimes"
-version = "0.7.5"
+version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "59ce5ef949d49ee85593fc4d3f3f95ad61657076395cbbce23e2121fc5542074"
+checksum = "cfa919a82ea574332e2de6e74b4c36e74d41982b335080fa59d4ef31be20fdf3"
+dependencies = [
+ "libc",
+ "windows-sys 0.45.0",
+]
 
 [[package]]
 name = "itertools"
@@ -1282,19 +1394,18 @@ dependencies = [
 
 [[package]]
 name = "linregress"
-version = "0.4.4"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d6c601a85f5ecd1aba625247bca0031585fb1c446461b142878a16f8245ddeb8"
+checksum = "475015a7f8f017edb28d2e69813be23500ad4b32cfe3421c4148efc97324ee52"
 dependencies = [
  "nalgebra",
- "statrs",
 ]
 
 [[package]]
 name = "linux-raw-sys"
-version = "0.0.46"
+version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d4d2456c373231a208ad294c33dc5bff30051eafd954cd4caae83a712b12854d"
+checksum = "f051f77a7c8e6957c0696eac88f26b0117e54f52d3fc682ab19397a8812846a4"
 
 [[package]]
 name = "lock_api"
@@ -1315,15 +1426,6 @@ dependencies = [
  "cfg-if",
 ]
 
-[[package]]
-name = "lru"
-version = "0.8.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b6e8aaa3f231bb4bd57b84b2d5dc3ae7f350265df8aa96492e0bc394a1571909"
-dependencies = [
- "hashbrown",
-]
-
 [[package]]
 name = "mach"
 version = "0.3.2"
@@ -1357,6 +1459,15 @@ version = "2.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
 
+[[package]]
+name = "memfd"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b20a59d985586e4a5aef64564ac77299f8586d8be6cf9106a5a40207e8908efb"
+dependencies = [
+ "rustix",
+]
+
 [[package]]
 name = "memoffset"
 version = "0.6.5"
@@ -1368,12 +1479,11 @@ dependencies = [
 
 [[package]]
 name = "memory-db"
-version = "0.31.0"
+version = "0.32.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5e0c7cba9ce19ac7ffd2053ac9f49843bbd3f4318feedfd74e85c19d5fb0ba66"
+checksum = "808b50db46293432a45e63bc15ea51e0ab4c0a1647b8eb114e31a3e698dd6fbe"
 dependencies = [
  "hash-db",
- "hashbrown",
 ]
 
 [[package]]
@@ -1405,9 +1515,9 @@ dependencies = [
 
 [[package]]
 name = "nalgebra"
-version = "0.27.1"
+version = "0.32.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "462fffe4002f4f2e1f6a9dcf12cc1a6fc0e15989014efc02a941d3e0f5dc2120"
+checksum = "d68d47bba83f9e2006d117a9a33af1524e655516b8919caac694427a6fb1e511"
 dependencies = [
  "approx",
  "matrixmultiply",
@@ -1415,17 +1525,15 @@ dependencies = [
  "num-complex",
  "num-rational",
  "num-traits",
- "rand 0.8.5",
- "rand_distr",
  "simba",
  "typenum",
 ]
 
 [[package]]
 name = "nalgebra-macros"
-version = "0.1.0"
+version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "01fcc0b8149b4632adc89ac3b7b31a12fb6099a0317a4eb2ebff574ef7de7218"
+checksum = "d232c68884c0c99810a5a4d333ef7e47689cfd0edc85efc9e54e1e6bf5212766"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1497,7 +1605,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "578ede34cf02f8924ab9447f50c28075b4d3e5b269972345e7e0372b38c6cdcd"
 dependencies = [
  "autocfg",
- "libm",
 ]
 
 [[package]]
@@ -1517,7 +1624,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "21158b2c33aa6d4561f1c0a6ea283ca92bc54802a93b263e910746d679a7eb53"
 dependencies = [
  "crc32fast",
- "hashbrown",
+ "hashbrown 0.12.3",
  "indexmap",
  "memchr",
 ]
@@ -1549,7 +1656,6 @@ dependencies = [
  "impl-trait-for-tuples",
  "parity-scale-codec",
  "scale-info",
- "sp-authorship",
  "sp-runtime",
  "sp-std",
 ]
@@ -1623,7 +1729,7 @@ dependencies = [
  "log",
  "pallet-election-provider-support-benchmarking",
  "parity-scale-codec",
- "rand 0.7.3",
+ "rand 0.8.5",
  "scale-info",
  "sp-arithmetic",
  "sp-core",
@@ -1631,7 +1737,6 @@ dependencies = [
  "sp-npos-elections",
  "sp-runtime",
  "sp-std",
- "static_assertions",
  "strum",
 ]
 
@@ -1677,7 +1782,6 @@ dependencies = [
  "frame-system",
  "log",
  "pallet-authorship",
- "pallet-bags-list",
  "pallet-session",
  "parity-scale-codec",
  "scale-info",
@@ -1708,9 +1812,9 @@ dependencies = [
 
 [[package]]
 name = "parity-scale-codec"
-version = "3.2.1"
+version = "3.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "366e44391a8af4cfd6002ef6ba072bae071a96aafca98d7d448a34c5dca38b6a"
+checksum = "637935964ff85a605d114591d4d2c13c5d1ba2806dae97cea6bf180238a749ac"
 dependencies = [
  "arrayvec 0.7.2",
  "bitvec",
@@ -1723,9 +1827,9 @@ dependencies = [
 
 [[package]]
 name = "parity-scale-codec-derive"
-version = "3.1.3"
+version = "3.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9299338969a3d2f491d65f140b00ddec470858402f888af98e8642fb5e8965cd"
+checksum = "86b26a931f824dd4eca30b3e43bb4f31cd5f0d3a403c5f5ff27106b805bfde7b"
 dependencies = [
  "proc-macro-crate",
  "proc-macro2",
@@ -1770,22 +1874,28 @@ checksum = "cf1c2c742266c2f1041c914ba65355a83ae8747b05f208319784083583494b4b"
 
 [[package]]
 name = "pbkdf2"
-version = "0.4.0"
+version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "216eaa586a190f0a738f2f918511eecfa90f13295abec0e457cdebcceda80cbd"
+checksum = "d95f5254224e617595d2cc3cc73ff0a5eaf2637519e25f03388154e9378b6ffa"
 dependencies = [
- "crypto-mac 0.8.0",
+ "crypto-mac 0.11.1",
 ]
 
 [[package]]
 name = "pbkdf2"
-version = "0.8.0"
+version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d95f5254224e617595d2cc3cc73ff0a5eaf2637519e25f03388154e9378b6ffa"
+checksum = "83a0692ec44e4cf1ef28ca317f14f8f07da2d95ec3fa01f86e4467b725e60917"
 dependencies = [
- "crypto-mac 0.11.1",
+ "digest 0.10.6",
 ]
 
+[[package]]
+name = "percent-encoding"
+version = "2.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "478c572c3d73181ff3c2539045f6eb99e5491218eae919370993b890cdbdd98e"
+
 [[package]]
 name = "pin-project-lite"
 version = "0.2.9"
@@ -1882,7 +1992,6 @@ dependencies = [
  "rand_chacha 0.2.2",
  "rand_core 0.5.1",
  "rand_hc",
- "rand_pcg",
 ]
 
 [[package]]
@@ -1934,16 +2043,6 @@ dependencies = [
  "getrandom 0.2.8",
 ]
 
-[[package]]
-name = "rand_distr"
-version = "0.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "32cb0b9bc82b0a0876c2dd994a7e7a2683d3e7390ca40e6886785ef0c7e3ee31"
-dependencies = [
- "num-traits",
- "rand 0.8.5",
-]
-
 [[package]]
 name = "rand_hc"
 version = "0.2.0"
@@ -1953,15 +2052,6 @@ dependencies = [
  "rand_core 0.5.1",
 ]
 
-[[package]]
-name = "rand_pcg"
-version = "0.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "16abd0c1b639e9eb4d7c50c0b8100b0d0f849be2349829c740fe8e6eb4816429"
-dependencies = [
- "rand_core 0.5.1",
-]
-
 [[package]]
 name = "rawpointer"
 version = "0.2.1"
@@ -2054,16 +2144,16 @@ checksum = "3e75f6a532d0fd9f7f13144f392b6ad56a32696bfcd9c78f797f16bbb6f072d6"
 
 [[package]]
 name = "rustix"
-version = "0.35.13"
+version = "0.36.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "727a1a6d65f786ec22df8a81ca3121107f235970dc1705ed681d3e6e8b9cd5f9"
+checksum = "fd5c6ff11fecd55b40746d1995a02f2eb375bf8c00d192d521ee09f42bef37bc"
 dependencies = [
  "bitflags",
  "errno",
  "io-lifetimes",
  "libc",
  "linux-raw-sys",
- "windows-sys 0.42.0",
+ "windows-sys 0.45.0",
 ]
 
 [[package]]
@@ -2078,6 +2168,15 @@ version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4501abdff3ae82a1c1b477a17252eb69cee9e66eb915c1abaa4f44d873df9f09"
 
+[[package]]
+name = "safe_arch"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "794821e4ccb0d9f979512f9c1973480123f9bd62a90d74ab0f9426fcf8f4a529"
+dependencies = [
+ "bytemuck",
+]
+
 [[package]]
 name = "scale-info"
 version = "2.3.1"
@@ -2104,6 +2203,17 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "schnellru"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "772575a524feeb803e5b0fcbc6dd9f367e579488197c94c6e4023aad2305774d"
+dependencies = [
+ "ahash 0.8.3",
+ "cfg-if",
+ "hashbrown 0.13.2",
+]
+
 [[package]]
 name = "schnorrkel"
 version = "0.9.1"
@@ -2273,14 +2383,15 @@ dependencies = [
 
 [[package]]
 name = "simba"
-version = "0.5.1"
+version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8e82063457853d00243beda9952e910b82593e4b07ae9f721b9278a99a0d3d5c"
+checksum = "50582927ed6f77e4ac020c057f37a268fc6aebc29225050365aacbb9deeeddc4"
 dependencies = [
  "approx",
  "num-complex",
  "num-traits",
  "paste",
+ "wide",
 ]
 
 [[package]]
@@ -2319,7 +2430,9 @@ dependencies = [
 name = "sp-api-proc-macro"
 version = "4.0.0-dev"
 dependencies = [
+ "Inflector",
  "blake2",
+ "expander",
  "proc-macro-crate",
  "proc-macro2",
  "quote",
@@ -2347,22 +2460,10 @@ dependencies = [
  "parity-scale-codec",
  "scale-info",
  "serde",
- "sp-debug-derive",
  "sp-std",
  "static_assertions",
 ]
 
-[[package]]
-name = "sp-authorship"
-version = "4.0.0-dev"
-dependencies = [
- "async-trait",
- "parity-scale-codec",
- "sp-inherents",
- "sp-runtime",
- "sp-std",
-]
-
 [[package]]
 name = "sp-core"
 version = "7.0.0"
@@ -2371,7 +2472,7 @@ dependencies = [
  "base58",
  "bitflags",
  "blake2",
- "byteorder",
+ "bounded-collections",
  "dyn-clonable",
  "ed25519-zebra",
  "futures",
@@ -2382,11 +2483,10 @@ dependencies = [
  "libsecp256k1",
  "log",
  "merlin",
- "num-traits",
  "parity-scale-codec",
  "parking_lot",
  "primitive-types",
- "rand 0.7.3",
+ "rand 0.8.5",
  "regex",
  "scale-info",
  "schnorrkel",
@@ -2403,7 +2503,6 @@ dependencies = [
  "substrate-bip39",
  "thiserror",
  "tiny-bip39",
- "wasmi",
  "zeroize",
 ]
 
@@ -2411,7 +2510,7 @@ dependencies = [
 name = "sp-core-hashing"
 version = "5.0.0"
 dependencies = [
- "blake2",
+ "blake2b_simd",
  "byteorder",
  "digest 0.10.6",
  "sha2 0.10.6",
@@ -2456,6 +2555,7 @@ dependencies = [
  "async-trait",
  "impl-trait-for-tuples",
  "parity-scale-codec",
+ "scale-info",
  "sp-core",
  "sp-runtime",
  "sp-std",
@@ -2467,13 +2567,12 @@ name = "sp-io"
 version = "7.0.0"
 dependencies = [
  "bytes",
+ "ed25519",
  "ed25519-dalek",
  "futures",
- "hash-db",
  "libsecp256k1",
  "log",
  "parity-scale-codec",
- "parking_lot",
  "secp256k1",
  "sp-core",
  "sp-externalities",
@@ -2483,7 +2582,6 @@ dependencies = [
  "sp-std",
  "sp-tracing",
  "sp-trie",
- "sp-wasm-interface",
  "tracing",
  "tracing-core",
 ]
@@ -2535,7 +2633,7 @@ dependencies = [
  "log",
  "parity-scale-codec",
  "paste",
- "rand 0.7.3",
+ "rand 0.8.5",
  "scale-info",
  "serde",
  "sp-application-crypto",
@@ -2593,6 +2691,7 @@ version = "4.0.0-dev"
 dependencies = [
  "parity-scale-codec",
  "scale-info",
+ "sp-core",
  "sp-runtime",
  "sp-std",
 ]
@@ -2603,10 +2702,9 @@ version = "0.13.0"
 dependencies = [
  "hash-db",
  "log",
- "num-traits",
  "parity-scale-codec",
  "parking_lot",
- "rand 0.7.3",
+ "rand 0.8.5",
  "smallvec",
  "sp-core",
  "sp-externalities",
@@ -2615,7 +2713,6 @@ dependencies = [
  "sp-trie",
  "thiserror",
  "tracing",
- "trie-root",
 ]
 
 [[package]]
@@ -2642,7 +2739,6 @@ dependencies = [
  "futures-timer",
  "log",
  "parity-scale-codec",
- "sp-api",
  "sp-inherents",
  "sp-runtime",
  "sp-std",
@@ -2664,16 +2760,16 @@ dependencies = [
 name = "sp-trie"
 version = "7.0.0"
 dependencies = [
- "ahash",
+ "ahash 0.8.3",
  "hash-db",
- "hashbrown",
+ "hashbrown 0.12.3",
  "lazy_static",
- "lru",
  "memory-db",
  "nohash-hasher",
  "parity-scale-codec",
  "parking_lot",
  "scale-info",
+ "schnellru",
  "sp-core",
  "sp-std",
  "thiserror",
@@ -2712,6 +2808,7 @@ dependencies = [
 name = "sp-wasm-interface"
 version = "7.0.0"
 dependencies = [
+ "anyhow",
  "impl-trait-for-tuples",
  "log",
  "parity-scale-codec",
@@ -2724,7 +2821,6 @@ dependencies = [
 name = "sp-weights"
 version = "4.0.0"
 dependencies = [
- "impl-trait-for-tuples",
  "parity-scale-codec",
  "scale-info",
  "serde",
@@ -2772,19 +2868,6 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
 
-[[package]]
-name = "statrs"
-version = "0.15.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "05bdbb8e4e78216a85785a85d3ec3183144f98d0097b9281802c019bb07a6f05"
-dependencies = [
- "approx",
- "lazy_static",
- "nalgebra",
- "num-traits",
- "rand 0.8.5",
-]
-
 [[package]]
 name = "strum"
 version = "0.24.1"
@@ -2901,17 +2984,17 @@ dependencies = [
 
 [[package]]
 name = "tiny-bip39"
-version = "0.8.2"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ffc59cb9dfc85bb312c3a78fd6aa8a8582e310b0fa885d5bb877f6dcc601839d"
+checksum = "62cc94d358b5a1e84a5cb9109f559aa3c4d634d2b1b4de3d0fa4adc7c78e2861"
 dependencies = [
  "anyhow",
- "hmac 0.8.1",
+ "hmac 0.12.1",
  "once_cell",
- "pbkdf2 0.4.0",
- "rand 0.7.3",
+ "pbkdf2 0.11.0",
+ "rand 0.8.5",
  "rustc-hash",
- "sha2 0.9.9",
+ "sha2 0.10.6",
  "thiserror",
  "unicode-normalization",
  "wasm-bindgen",
@@ -3020,12 +3103,12 @@ dependencies = [
 
 [[package]]
 name = "trie-db"
-version = "0.24.0"
+version = "0.27.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "004e1e8f92535694b4cb1444dc5a8073ecf0815e3357f729638b9f8fc4062908"
+checksum = "634d75c77ea43f2ad8ea9d9c58de49dfc9c3995bdef32b503df7883ff054e7f1"
 dependencies = [
  "hash-db",
- "hashbrown",
+ "hashbrown 0.13.2",
  "log",
  "rustc-hex",
  "smallvec",
@@ -3033,9 +3116,9 @@ dependencies = [
 
 [[package]]
 name = "trie-root"
-version = "0.17.0"
+version = "0.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9a36c5ca3911ed3c9a5416ee6c679042064b93fc637ded67e25f92e68d783891"
+checksum = "d4ed310ef5ab98f5fa467900ed906cb9232dd5376597e00fd4cba2a449d06c0b"
 dependencies = [
  "hash-db",
 ]
@@ -3076,6 +3159,12 @@ dependencies = [
  "static_assertions",
 ]
 
+[[package]]
+name = "unicode-bidi"
+version = "0.3.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "524b68aca1d05e03fdf03fcdce2c6c94b6daf6d16861ddaa7e4f2b6638a9052c"
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.5"
@@ -3103,6 +3192,17 @@ version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f962df74c8c05a667b5ee8bcf162993134c104e96440b663c8daa176dc772d8c"
 
+[[package]]
+name = "url"
+version = "2.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0d68c799ae75762b8c3fe375feb6600ef5602c883c5d21eb51c09f22b83c4643"
+dependencies = [
+ "form_urlencoded",
+ "idna",
+ "percent-encoding",
+]
+
 [[package]]
 name = "valuable"
 version = "0.1.0"
@@ -3216,18 +3316,19 @@ dependencies = [
 
 [[package]]
 name = "wasmparser"
-version = "0.89.1"
+version = "0.100.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ab5d3e08b13876f96dd55608d03cd4883a0545884932d5adf11925876c96daef"
+checksum = "64b20236ab624147dfbb62cf12a19aaf66af0e41b8398838b66e997d07d269d4"
 dependencies = [
  "indexmap",
+ "url",
 ]
 
 [[package]]
 name = "wasmtime"
-version = "1.0.2"
+version = "6.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4ad5af6ba38311282f2a21670d96e78266e8c8e2f38cbcd52c254df6ccbc7731"
+checksum = "f6e89f9819523447330ffd70367ef4a18d8c832e24e8150fe054d1d912841632"
 dependencies = [
  "anyhow",
  "bincode",
@@ -3245,23 +3346,23 @@ dependencies = [
  "wasmtime-environ",
  "wasmtime-jit",
  "wasmtime-runtime",
- "windows-sys 0.36.1",
+ "windows-sys 0.42.0",
 ]
 
 [[package]]
 name = "wasmtime-asm-macros"
-version = "1.0.2"
+version = "6.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "45de63ddfc8b9223d1adc8f7b2ee5f35d1f6d112833934ad7ea66e4f4339e597"
+checksum = "9bd3a5e46c198032da934469f3a6e48649d1f9142438e4fd4617b68a35644b8a"
 dependencies = [
  "cfg-if",
 ]
 
 [[package]]
 name = "wasmtime-environ"
-version = "1.0.2"
+version = "6.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ebb881c61f4f627b5d45c54e629724974f8a8890d455bcbe634330cc27309644"
+checksum = "9a6db9fc52985ba06ca601f2ff0ff1f526c5d724c7ac267b47326304b0c97883"
 dependencies = [
  "anyhow",
  "cranelift-entity",
@@ -3278,9 +3379,9 @@ dependencies = [
 
 [[package]]
 name = "wasmtime-jit"
-version = "1.0.2"
+version = "6.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1985c628011fe26adf5e23a5301bdc79b245e0e338f14bb58b39e4e25e4d8681"
+checksum = "b77e3a52cd84d0f7f18554afa8060cfe564ccac61e3b0802d3fd4084772fa5f6"
 dependencies = [
  "addr2line",
  "anyhow",
@@ -3291,29 +3392,39 @@ dependencies = [
  "log",
  "object",
  "rustc-demangle",
- "rustix",
  "serde",
  "target-lexicon",
- "thiserror",
  "wasmtime-environ",
+ "wasmtime-jit-icache-coherence",
  "wasmtime-runtime",
- "windows-sys 0.36.1",
+ "windows-sys 0.42.0",
 ]
 
 [[package]]
 name = "wasmtime-jit-debug"
-version = "1.0.2"
+version = "6.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f671b588486f5ccec8c5a3dba6b4c07eac2e66ab8c60e6f4e53717c77f709731"
+checksum = "d0245e8a9347017c7185a72e215218a802ff561545c242953c11ba00fccc930f"
 dependencies = [
  "once_cell",
 ]
 
+[[package]]
+name = "wasmtime-jit-icache-coherence"
+version = "6.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "67d412e9340ab1c83867051d8d1d7c90aa8c9afc91da086088068e2734e25064"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "windows-sys 0.42.0",
+]
+
 [[package]]
 name = "wasmtime-runtime"
-version = "1.0.2"
+version = "6.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ee8f92ad4b61736339c29361da85769ebc200f184361959d1792832e592a1afd"
+checksum = "d594e791b5fdd4dbaf8cf7ae62f2e4ff85018ce90f483ca6f42947688e48827d"
 dependencies = [
  "anyhow",
  "cc",
@@ -3322,22 +3433,22 @@ dependencies = [
  "libc",
  "log",
  "mach",
+ "memfd",
  "memoffset",
  "paste",
  "rand 0.8.5",
  "rustix",
- "thiserror",
  "wasmtime-asm-macros",
  "wasmtime-environ",
  "wasmtime-jit-debug",
- "windows-sys 0.36.1",
+ "windows-sys 0.42.0",
 ]
 
 [[package]]
 name = "wasmtime-types"
-version = "1.0.2"
+version = "6.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d23d61cb4c46e837b431196dd06abb11731541021916d03476a178b54dc07aeb"
+checksum = "a6688d6f96d4dbc1f89fab626c56c1778936d122b5f4ae7a57c2eb42b8d982e2"
 dependencies = [
  "cranelift-entity",
  "serde",
@@ -3345,6 +3456,16 @@ dependencies = [
  "wasmparser",
 ]
 
+[[package]]
+name = "wide"
+version = "0.7.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b689b6c49d6549434bf944e6b0f39238cf63693cb7a147e9d887507fffa3b223"
+dependencies = [
+ "bytemuck",
+ "safe_arch",
+]
+
 [[package]]
 name = "winapi"
 version = "0.3.9"
@@ -3376,19 +3497,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 
-[[package]]
-name = "windows-sys"
-version = "0.36.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ea04155a16a59f9eab786fe12a4a450e75cdb175f9e0d80da1e17db09f55b8d2"
-dependencies = [
- "windows_aarch64_msvc 0.36.1",
- "windows_i686_gnu 0.36.1",
- "windows_i686_msvc 0.36.1",
- "windows_x86_64_gnu 0.36.1",
- "windows_x86_64_msvc 0.36.1",
-]
-
 [[package]]
 name = "windows-sys"
 version = "0.42.0"
@@ -3396,85 +3504,79 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5a3e1820f08b8513f676f7ab6c1f99ff312fb97b553d30ff4dd86f9f15728aa7"
 dependencies = [
  "windows_aarch64_gnullvm",
- "windows_aarch64_msvc 0.42.0",
- "windows_i686_gnu 0.42.0",
- "windows_i686_msvc 0.42.0",
- "windows_x86_64_gnu 0.42.0",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
  "windows_x86_64_gnullvm",
- "windows_x86_64_msvc 0.42.0",
+ "windows_x86_64_msvc",
 ]
 
 [[package]]
-name = "windows_aarch64_gnullvm"
-version = "0.42.0"
+name = "windows-sys"
+version = "0.45.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "41d2aa71f6f0cbe00ae5167d90ef3cfe66527d6f613ca78ac8024c3ccab9a19e"
+checksum = "75283be5efb2831d37ea142365f009c02ec203cd29a3ebecbc093d52315b66d0"
+dependencies = [
+ "windows-targets",
+]
 
 [[package]]
-name = "windows_aarch64_msvc"
-version = "0.36.1"
+name = "windows-targets"
+version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9bb8c3fd39ade2d67e9874ac4f3db21f0d710bee00fe7cab16949ec184eeaa47"
+checksum = "8e5180c00cd44c9b1c88adb3693291f1cd93605ded80c250a75d472756b4d071"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
 
 [[package]]
-name = "windows_aarch64_msvc"
-version = "0.42.0"
+name = "windows_aarch64_gnullvm"
+version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dd0f252f5a35cac83d6311b2e795981f5ee6e67eb1f9a7f64eb4500fbc4dcdb4"
+checksum = "597a5118570b68bc08d8d59125332c54f1ba9d9adeedeef5b99b02ba2b0698f8"
 
 [[package]]
-name = "windows_i686_gnu"
-version = "0.36.1"
+name = "windows_aarch64_msvc"
+version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "180e6ccf01daf4c426b846dfc66db1fc518f074baa793aa7d9b9aaeffad6a3b6"
+checksum = "e08e8864a60f06ef0d0ff4ba04124db8b0fb3be5776a5cd47641e942e58c4d43"
 
 [[package]]
 name = "windows_i686_gnu"
-version = "0.42.0"
+version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fbeae19f6716841636c28d695375df17562ca208b2b7d0dc47635a50ae6c5de7"
+checksum = "c61d927d8da41da96a81f029489353e68739737d3beca43145c8afec9a31a84f"
 
 [[package]]
 name = "windows_i686_msvc"
-version = "0.36.1"
+version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e2e7917148b2812d1eeafaeb22a97e4813dfa60a3f8f78ebe204bcc88f12f024"
-
-[[package]]
-name = "windows_i686_msvc"
-version = "0.42.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "84c12f65daa39dd2babe6e442988fc329d6243fdce47d7d2d155b8d874862246"
+checksum = "44d840b6ec649f480a41c8d80f9c65108b92d89345dd94027bfe06ac444d1060"
 
 [[package]]
 name = "windows_x86_64_gnu"
-version = "0.36.1"
+version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4dcd171b8776c41b97521e5da127a2d86ad280114807d0b2ab1e462bc764d9e1"
-
-[[package]]
-name = "windows_x86_64_gnu"
-version = "0.42.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bf7b1b21b5362cbc318f686150e5bcea75ecedc74dd157d874d754a2ca44b0ed"
+checksum = "8de912b8b8feb55c064867cf047dda097f92d51efad5b491dfb98f6bbb70cb36"
 
 [[package]]
 name = "windows_x86_64_gnullvm"
-version = "0.42.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "09d525d2ba30eeb3297665bd434a54297e4170c7f1a44cad4ef58095b4cd2028"
-
-[[package]]
-name = "windows_x86_64_msvc"
-version = "0.36.1"
+version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c811ca4a8c853ef420abd8592ba53ddbbac90410fab6903b3e79972a631f7680"
+checksum = "26d41b46a36d453748aedef1486d5c7a85db22e56aff34643984ea85514e94a3"
 
 [[package]]
 name = "windows_x86_64_msvc"
-version = "0.42.0"
+version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f40009d85759725a34da6d89a94e63d7bdc50a862acf0dbc7c8e488f1edcb6f5"
+checksum = "9aec5da331524158c6d1a4ac0ab1541149c0b9505fde06423b02f5ef0106b9f0"
 
 [[package]]
 name = "wyz"
diff --git a/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs b/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
index 054aea1a061dc..cd23a0bbef8a7 100644
--- a/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
+++ b/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
@@ -38,7 +38,7 @@ use sp_staking::{
 use sp_std::prelude::*;
 use std::collections::BTreeMap;
 
-use frame_election_provider_support::{onchain, SequentialPhragmen, Weight};
+use frame_election_provider_support::{onchain, ElectionDataProvider, SequentialPhragmen, Weight};
 use pallet_election_provider_multi_phase::{
 	unsigned::MinerConfig, ElectionCompute, QueuedSolution, SolutionAccuracyOf,
 };
@@ -222,9 +222,11 @@ impl pallet_election_provider_multi_phase::Config for Runtime {
 impl MinerConfig for Runtime {
 	type AccountId = AccountId;
 	type Solution = MockNposSolution;
-	type MaxVotesPerVoter = MaxNominations;
+	type MaxVotesPerVoter =
+	<<Self as pallet_election_provider_multi_phase::Config>::DataProvider as ElectionDataProvider>::MaxVotesPerVoter;
 	type MaxLength = MinerMaxLength;
 	type MaxWeight = MinerMaxWeight;
+	type MaxWinners = MaxWinners;
 
 	fn solution_weight(_v: u32, _t: u32, _a: u32, _d: u32) -> Weight {
 		Weight::zero()
@@ -264,7 +266,7 @@ impl pallet_staking::Config for Runtime {
 	type SessionsPerEra = SessionsPerEra;
 	type BondingDuration = BondingDuration;
 	type SlashDeferDuration = SlashDeferDuration;
-	type SlashCancelOrigin = EnsureRoot<AccountId>; // root can cancel slashes
+	type AdminOrigin = EnsureRoot<AccountId>; // root can cancel slashes
 	type SessionInterface = Self;
 	type EraPayout = ();
 	type NextNewSession = Session;

From 3eb15b6e42cbb0d5b8fc94a382668b7d2efc7340 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gon=C3=A7alo=20Pestana?= <g6pestana@gmail.com>
Date: Thu, 16 Mar 2023 09:27:35 +0100
Subject: [PATCH 22/22] integration test fixes and additions

---
 .../test-staking-e2e/src/lib.rs               | 110 +++++++++++-------
 .../test-staking-e2e/src/mock.rs              |  88 ++++++++------
 2 files changed, 120 insertions(+), 78 deletions(-)

diff --git a/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs b/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
index ab5a164c64f49..c8f7d48a89ecf 100644
--- a/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
+++ b/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
@@ -21,6 +21,7 @@ mod mock;
 pub(crate) const LOG_TARGET: &str = "tests::e2e-epm";
 
 use mock::*;
+use sp_core::Get;
 use sp_npos_elections::{to_supports, StakedAssignment};
 use sp_runtime::Perbill;
 
@@ -50,20 +51,35 @@ fn log_current_time() {
 }
 
 #[test]
-fn setup_works() {
+fn block_progression_works() {
 	ExtBuilder::default().build_and_execute(|| {
 		assert_eq!(active_era(), 0);
+		assert_eq!(Session::current_index(), 0);
+		assert!(ElectionProviderMultiPhase::current_phase().is_off());
 
 		assert!(start_next_active_era().is_ok());
-		assert!(start_next_active_era().is_ok());
-		assert_eq!(active_era(), 2);
+		assert_eq!(active_era(), 1);
+		assert_eq!(Session::current_index(), <SessionsPerEra as Get<u32>>::get());
+
+		assert!(ElectionProviderMultiPhase::current_phase().is_off());
+
+		roll_to_epm_signed();
+		assert!(ElectionProviderMultiPhase::current_phase().is_signed());
+	});
+
+	ExtBuilder::default().build_and_execute(|| {
+		assert_eq!(active_era(), 0);
+		assert_eq!(Session::current_index(), 0);
+		assert!(ElectionProviderMultiPhase::current_phase().is_off());
 
-		// if the solution is delayed, EPM will end up in emergency mode and eras won't progress.
-		assert!(start_next_active_era_delayed_solution().is_ok());
 		assert!(start_next_active_era_delayed_solution().is_ok());
+		// if the solution is delayed, EPM will end up in emergency mode..
 		assert!(ElectionProviderMultiPhase::current_phase().is_emergency());
-		assert_eq!(active_era(), 3);
-	});
+		// .. era won't progress..
+		assert_eq!(active_era(), 0);
+		// .. but session does.
+		assert_eq!(Session::current_index(), 2);
+	})
 }
 
 #[test]
@@ -79,9 +95,11 @@ fn setup_works() {
 /// solution is added to EPM's `QueuedSolution` queue. This can be achieved through
 /// `Call::set_emergency_election_result` or `Call::governance_fallback` dispatchables. Once a new
 /// solution is added to the queue, EPM phase transitions to `Phase::Off` and the election flow
-/// restarts.
+/// restarts. Note that in this test case, the emergency throttling is disabled.
 fn enters_emergency_phase_after_forcing_before_elect() {
-	ExtBuilder::default().build_and_execute(|| {
+	let epm_builder = EpmExtBuilder::default().disable_emergency_throttling();
+
+	ExtBuilder::default().epm(epm_builder).build_and_execute(|| {
 		log!(
 			trace,
 			"current validators (staking): {:?}",
@@ -91,7 +109,6 @@ fn enters_emergency_phase_after_forcing_before_elect() {
 
 		roll_to_epm_off();
 		assert!(ElectionProviderMultiPhase::current_phase().is_off());
-		log_current_time();
 
 		assert_eq!(pallet_staking::ForceEra::<Runtime>::get(), pallet_staking::Forcing::NotForcing);
 		// slashes so that staking goes into `Forcing::ForceNew`.
@@ -104,10 +121,10 @@ fn enters_emergency_phase_after_forcing_before_elect() {
 		log_current_time();
 
 		let era_before_delayed_next = Staking::current_era();
-		// try to advance 2 eras with a delayed solution.
+		// try to advance 2 eras.
 		assert!(start_next_active_era_delayed_solution().is_ok());
 		assert_eq!(Staking::current_era(), era_before_delayed_next);
-		assert!(start_next_active_era_delayed_solution().is_ok());
+		assert!(start_next_active_era().is_err());
 		assert_eq!(Staking::current_era(), era_before_delayed_next);
 
 		// EPM is still in emergency phase.
@@ -131,8 +148,7 @@ fn enters_emergency_phase_after_forcing_before_elect() {
 		// EPM can now roll to signed phase to proceed with elections. The validator set is the
 		// expected (ie. set through `set_emergency_election_result`).
 		roll_to_epm_signed();
-		log_current_time();
-		assert!(ElectionProviderMultiPhase::current_phase().is_signed());
+		//assert!(ElectionProviderMultiPhase::current_phase().is_signed());
 		assert_eq!(Session::validators(), vec![21, 31, 41]);
 		assert_eq!(Staking::current_era(), era_before_delayed_next.map(|e| e + 1));
 	});
@@ -150,35 +166,41 @@ fn enters_emergency_phase_after_forcing_before_elect() {
 /// fail and enter in emenergency mode.
 fn continous_slashes_below_offending_threshold() {
 	let staking_builder = StakingExtBuilder::default().validator_count(10);
-
-	ExtBuilder::default().staking(staking_builder).build_and_execute(|| {
-		assert_eq!(Session::validators().len(), 10);
-		let mut active_validator_set = Session::validators();
-
-		// set a minimum election score.
-		assert!(set_minimum_election_score(500, 1000, 500).is_ok());
-
-		// slash 10% of the active validators and progress era until the minimum trusted score
-		// is reached.
-		while active_validator_set.len() > 0 {
-			let slashed = slash_percentage(Perbill::from_percent(10));
-			assert_eq!(slashed.len(), 1);
-
-			// break loop when era does not progress; EPM is in emergency phase as election
-			// failed due to election minimum score.
-			if start_next_active_era().is_err() {
-				assert!(ElectionProviderMultiPhase::current_phase().is_emergency());
-				break
+	let epm_builder = EpmExtBuilder::default().disable_emergency_throttling();
+
+	ExtBuilder::default()
+		.staking(staking_builder)
+		.epm(epm_builder)
+		.build_and_execute(|| {
+			assert_eq!(Session::validators().len(), 10);
+			let mut active_validator_set = Session::validators();
+
+			roll_to_epm_signed();
+
+			// set a minimum election score.
+			assert!(set_minimum_election_score(500, 1000, 500).is_ok());
+
+			// slash 10% of the active validators and progress era until the minimum trusted score
+			// is reached.
+			while active_validator_set.len() > 0 {
+				let slashed = slash_percentage(Perbill::from_percent(10));
+				assert_eq!(slashed.len(), 1);
+
+				// break loop when era does not progress; EPM is in emergency phase as election
+				// failed due to election minimum score.
+				if start_next_active_era().is_err() {
+					assert!(ElectionProviderMultiPhase::current_phase().is_emergency());
+					break
+				}
+
+				active_validator_set = Session::validators();
+
+				log!(
+					trace,
+					"slashed 10% of active validators ({:?}). After slash: {:?}",
+					slashed,
+					active_validator_set
+				);
 			}
-
-			active_validator_set = Session::validators();
-
-			log!(
-				trace,
-				"slashed 10% of active validators ({:?}). After slash: {:?}",
-				slashed,
-				active_validator_set
-			);
-		}
-	});
+		});
 }
diff --git a/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs b/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
index cd23a0bbef8a7..19f568737c852 100644
--- a/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
+++ b/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
@@ -44,7 +44,7 @@ use pallet_election_provider_multi_phase::{
 };
 use pallet_staking::StakerStatus;
 
-use crate::log_current_time;
+use crate::{log, log_current_time};
 
 pub const INIT_TIMESTAMP: u64 = 30_000;
 pub const BLOCK_TIME: u64 = 1000;
@@ -135,7 +135,7 @@ impl pallet_timestamp::Config for Runtime {
 }
 
 parameter_types! {
-	pub static Period: BlockNumber = 15;
+	pub static Period: BlockNumber = 30;
 	pub static Offset: BlockNumber = 0;
 }
 
@@ -173,7 +173,10 @@ frame_election_provider_support::generate_solution_type!(
 
 parameter_types! {
 	pub static SignedPhase: BlockNumber = 10;
-	pub static UnsignedPhase: BlockNumber = 5;
+	pub static UnsignedPhase: BlockNumber = 10;
+	// we expect a minimum of 3 blocks in signed phase and unsigned phases before trying
+	// enetering in emergency phase after the election failed.
+	pub static MinBlocksBeforeEmergency: BlockNumber = 3;
 	pub static MaxElectingVoters: VoterIndex = 1000;
 	pub static MaxElectableTargets: TargetIndex = 1000;
 	pub static MaxActiveValidators: u32 = 1000;
@@ -408,6 +411,11 @@ impl Default for EpmExtBuilder {
 }
 
 impl EpmExtBuilder {
+	pub fn disable_emergency_throttling(self) -> Self {
+		<MinBlocksBeforeEmergency>::set(0);
+		self
+	}
+
 	pub fn phases(self, signed: BlockNumber, unsigned: BlockNumber) -> Self {
 		<SignedPhase>::set(signed);
 		<UnsignedPhase>::set(unsigned);
@@ -562,38 +570,37 @@ pub fn roll_to(n: BlockNumber, delay_solution: bool) {
 		Session::on_initialize(b);
 		Timestamp::set_timestamp(System::block_number() * BLOCK_TIME + INIT_TIMESTAMP);
 
-		// if EPM is in off phase, there's no solution and the solution should not be delayed, try
-		// "minining" and queue a solution.
-		if ElectionProviderMultiPhase::snapshot().is_none() &&
-			ElectionProviderMultiPhase::current_phase().is_off() &&
-			!delay_solution
-		{
-			ElectionProviderMultiPhase::on_initialize(n);
-			let _ = try_queue_solution(ElectionCompute::Signed);
-		} else {
-			ElectionProviderMultiPhase::on_initialize(n);
-		};
+		// TODO(gpestana): implement a realistic OCW worker insted of simulating it
+		// https://github.com/paritytech/substrate/issues/13589
+		// if there's no solution queued and the solution should not be delayed, try mining and
+		// queue a solution.
+		if ElectionProviderMultiPhase::current_phase().is_signed() && !delay_solution {
+			let _ = try_queue_solution(ElectionCompute::Signed).map_err(|e| {
+				log!(info, "failed to mine/queue solution: {:?}", e);
+			});
+		}
+		ElectionProviderMultiPhase::on_initialize(b);
+
 		Staking::on_initialize(b);
 		if b != n {
 			Staking::on_finalize(System::block_number());
 		}
-	}
-	log_current_time();
-}
 
-// Progress one block.
-pub fn roll_one(delay_solution: bool) {
-	roll_to(System::block_number() + 1, delay_solution);
+		log_current_time();
+	}
 }
 
-/// Progresses from the current block number (whatever that may be) to the `P * session_index + 1`.
+/// Progresses from the current block number (whatever that may be) to the block where the session
+/// `session_index` starts.
 pub(crate) fn start_session(session_index: SessionIndex, delay_solution: bool) {
 	let end: u64 = if Offset::get().is_zero() {
-		(session_index as u64) * Period::get()
+		Period::get() * (session_index as u64)
 	} else {
-		Offset::get() + (session_index.saturating_sub(1) as u64) * Period::get()
+		Offset::get() * (session_index as u64) + Period::get() * (session_index as u64)
 	};
 
+	assert!(end >= System::block_number());
+
 	roll_to(end, delay_solution);
 
 	// session must have progressed properly.
@@ -617,10 +624,29 @@ pub(crate) fn advance_session_delayed_solution() {
 	start_session(current_index + 1, true);
 }
 
+pub(crate) fn start_next_active_era() -> Result<(), ()> {
+	start_active_era(active_era() + 1, false)
+}
+
+pub(crate) fn start_next_active_era_delayed_solution() -> Result<(), ()> {
+	start_active_era(active_era() + 1, true)
+}
+
 /// Progress until the given era.
 pub(crate) fn start_active_era(era_index: EraIndex, delay_solution: bool) -> Result<(), ()> {
+	let era_before = current_era();
+
 	start_session((era_index * <SessionsPerEra as Get<u32>>::get()).into(), delay_solution);
 
+	log!(
+		info,
+		"start_active_era - era_before: {}, current era: {} -> progress to: {} -> after era: {}",
+		era_before,
+		active_era(),
+		era_index,
+		current_era(),
+	);
+
 	// if the solution was not delayed, era should have progressed.
 	if !delay_solution && (active_era() != era_index || current_era() != active_era()) {
 		Err(())
@@ -629,14 +655,6 @@ pub(crate) fn start_active_era(era_index: EraIndex, delay_solution: bool) -> Res
 	}
 }
 
-pub(crate) fn start_next_active_era() -> Result<(), ()> {
-	start_active_era(active_era() + 1, false)
-}
-
-pub(crate) fn start_next_active_era_delayed_solution() -> Result<(), ()> {
-	start_active_era(active_era() + 1, true)
-}
-
 pub(crate) fn active_era() -> EraIndex {
 	Staking::active_era().unwrap().index
 }
@@ -676,13 +694,15 @@ pub fn roll_to_epm_off() {
 }
 
 // Queue a solution based on the current snapshot.
-pub(crate) fn try_queue_solution(when: ElectionCompute) -> Result<(), ()> {
-	let raw_solution = ElectionProviderMultiPhase::mine_solution().map_err(|_| ())?;
+pub(crate) fn try_queue_solution(when: ElectionCompute) -> Result<(), String> {
+	let raw_solution = ElectionProviderMultiPhase::mine_solution()
+		.map_err(|e| format!("error mining solution: {:?}", e))?;
+
 	ElectionProviderMultiPhase::feasibility_check(raw_solution.0, when)
 		.map(|ready| {
 			QueuedSolution::<Runtime>::put(ready);
 		})
-		.map_err(|_| ())
+		.map_err(|e| format!("error in solution feasibility: {:?}", e))
 }
 
 pub(crate) fn on_offence_now(