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diff --git a/frame/election-provider-multi-phase/test-staking-e2e/Cargo.toml b/frame/election-provider-multi-phase/test-staking-e2e/Cargo.toml
new file mode 100644
index 0000000000000..432b732b48e9d
--- /dev/null
+++ b/frame/election-provider-multi-phase/test-staking-e2e/Cargo.toml
@@ -0,0 +1,40 @@
+[package]
+name = "pallet-election-provider-e2e-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" }
+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" }
+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-staking-e2e/src/lib.rs b/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
new file mode 100644
index 0000000000000..c8f7d48a89ecf
--- /dev/null
+++ b/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs
@@ -0,0 +1,206 @@
+// This file is part of Substrate.
+
+// Copyright (C) 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;
+
+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;
+
+use crate::mock::RuntimeOrigin;
+
+// syntactic sugar for logging.
+#[macro_export]
+macro_rules! log {
+	($level:tt, $patter:expr $(, $values:expr)* $(,)?) => {
+		log::$level!(
+			target: crate::LOG_TARGET,
+			concat!("🛠️  ", $patter)  $(, $values)*
+        )
+    };
+}
+
+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()
+	);
+}
+
+#[test]
+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_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());
+
+		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());
+		// .. era won't progress..
+		assert_eq!(active_era(), 0);
+		// .. but session does.
+		assert_eq!(Session::current_index(), 2);
+	})
+}
+
+#[test]
+/// Replicates the Kusama incident of 8th Dec 2022 and its resolution through the governance
+/// fallback.
+///
+/// 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
+/// 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. Note that in this test case, the emergency throttling is disabled.
+fn enters_emergency_phase_after_forcing_before_elect() {
+	let epm_builder = EpmExtBuilder::default().disable_emergency_throttling();
+
+	ExtBuilder::default().epm(epm_builder).build_and_execute(|| {
+		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 so that staking goes into `Forcing::ForceNew`.
+		slash_through_offending_threshold();
+
+		assert_eq!(pallet_staking::ForceEra::<Runtime>::get(), pallet_staking::Forcing::ForceNew);
+
+		advance_session_delayed_solution();
+		assert!(ElectionProviderMultiPhase::current_phase().is_emergency());
+		log_current_time();
+
+		let era_before_delayed_next = Staking::current_era();
+		// 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().is_err());
+		assert_eq!(Staking::current_era(), era_before_delayed_next);
+
+		// 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]);
+		assert_eq!(Staking::current_era(), era_before_delayed_next.map(|e| e + 1));
+	});
+}
+
+#[test]
+/// 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
+/// 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
+/// fail and enter in emenergency mode.
+fn continous_slashes_below_offending_threshold() {
+	let staking_builder = StakingExtBuilder::default().validator_count(10);
+	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
+				);
+			}
+		});
+}
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
new file mode 100644
index 0000000000000..19f568737c852
--- /dev/null
+++ b/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs
@@ -0,0 +1,779 @@
+// 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.
+
+#![allow(dead_code)]
+
+use _feps::ExtendedBalance;
+use frame_support::{
+	parameter_types, traits,
+	traits::{GenesisBuild, Hooks},
+	weights::constants,
+};
+use frame_system::EnsureRoot;
+use sp_core::{ConstU32, Get, H256};
+use sp_npos_elections::{ElectionScore, VoteWeight};
+use sp_runtime::{
+	testing,
+	traits::{IdentityLookup, Zero},
+	transaction_validity, PerU16, Perbill,
+};
+use sp_staking::{
+	offence::{DisableStrategy, OffenceDetails, OnOffenceHandler},
+	EraIndex, SessionIndex,
+};
+use sp_std::prelude::*;
+use std::collections::BTreeMap;
+
+use frame_election_provider_support::{onchain, ElectionDataProvider, SequentialPhragmen, Weight};
+use pallet_election_provider_multi_phase::{
+	unsigned::MinerConfig, ElectionCompute, QueuedSolution, SolutionAccuracyOf,
+};
+use pallet_staking::StakerStatus;
+
+use crate::{log, log_current_time};
+
+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>;
+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,
+		Historical: pallet_session::historical,
+		Timestamp: pallet_timestamp,
+	}
+);
+
+pub(crate) type AccountId = u128;
+pub(crate) type AccountIndex = u32;
+pub(crate) type BlockNumber = u64;
+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;
+	type BlockWeights = 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>;
+}
+
+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 {
+	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 = Moment;
+	type OnTimestampSet = ();
+	type MinimumPeriod = traits::ConstU64<5>;
+	type WeightInfo = ();
+}
+
+parameter_types! {
+	pub static Period: BlockNumber = 30;
+	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 NextSessionRotation = pallet_session::PeriodicSessions<Period, Offset>;
+	type SessionHandler = (OtherSessionHandler,);
+	type RuntimeEvent = RuntimeEvent;
+	type ValidatorId = AccountId;
+	type ValidatorIdOf = pallet_staking::StashOf<Runtime>;
+	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 static SignedPhase: BlockNumber = 10;
+	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;
+	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;
+	pub static MaxNominations: u32 = 16;
+}
+
+impl pallet_election_provider_multi_phase::Config for Runtime {
+	type RuntimeEvent = RuntimeEvent;
+	type Currency = Balances;
+	type EstimateCallFee = frame_support::traits::ConstU32<8>;
+	type SignedPhase = SignedPhase;
+	type UnsignedPhase = UnsignedPhase;
+	type BetterSignedThreshold = ();
+	type 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 =
+		frame_election_provider_support::NoElection<(AccountId, BlockNumber, Staking, MaxWinners)>;
+	type GovernanceFallback = onchain::OnChainExecution<OnChainSeqPhragmen>;
+	type Solver = SequentialPhragmen<AccountId, SolutionAccuracyOf<Runtime>, ()>;
+	type ForceOrigin = EnsureRoot<AccountId>;
+	type MaxElectableTargets = MaxElectableTargets;
+	type MaxElectingVoters = MaxElectingVoters;
+	type MaxWinners = MaxWinners;
+	type BenchmarkingConfig = NoopElectionProviderBenchmarkConfig;
+	type WeightInfo = ();
+}
+
+impl MinerConfig for Runtime {
+	type AccountId = AccountId;
+	type Solution = MockNposSolution;
+	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()
+	}
+}
+
+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 = 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;
+	pub const OffendingValidatorsThreshold: Perbill = Perbill::from_percent(40);
+	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 = Timestamp;
+	type CurrencyToVote = traits::SaturatingCurrencyToVote;
+	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 AdminOrigin = 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 = pallet_staking::TestBenchmarkingConfig;
+}
+
+impl<LocalCall> frame_system::offchain::SendTransactionTypes<LocalCall> for Runtime
+where
+	RuntimeCall: From<LocalCall>,
+{
+	type OverarchingCall = RuntimeCall;
+	type Extrinsic = Extrinsic;
+}
+
+pub struct OnChainSeqPhragmen;
+
+parameter_types! {
+	pub static VotersBound: u32 = 600;
+	pub static 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;
+	type WeightInfo = ();
+	type MaxWinners = MaxWinners;
+	type VotersBound = VotersBound;
+	type TargetsBound = TargetsBound;
+}
+
+pub struct NoopElectionProviderBenchmarkConfig;
+
+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;
+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;
+}
+
+pub struct StakingExtBuilder {
+	validator_count: u32,
+	minimum_validator_count: u32,
+	min_nominator_bond: Balance,
+	min_validator_bond: Balance,
+	status: BTreeMap<AccountId, StakerStatus<AccountId>>,
+	stakes: BTreeMap<AccountId, Balance>,
+	stakers: Vec<(AccountId, AccountId, Balance, StakerStatus<AccountId>)>,
+}
+
+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,
+			min_nominator_bond: ExistentialDeposit::get(),
+			min_validator_bond: ExistentialDeposit::get(),
+			status: Default::default(),
+			stakes: 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 disable_emergency_throttling(self) -> Self {
+		<MinBlocksBeforeEmergency>::set(0);
+		self
+	}
+
+	pub fn phases(self, signed: BlockNumber, unsigned: BlockNumber) -> Self {
+		<SignedPhase>::set(signed);
+		<UnsignedPhase>::set(unsigned);
+		self
+	}
+}
+
+pub 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(),
+		}
+	}
+}
+
+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: 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.staking_builder.validator_count,
+			minimum_validator_count: self.staking_builder.minimum_validator_count,
+			slash_reward_fraction: Perbill::from_percent(10),
+			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> {
+			// 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);
+
+		// 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 staking(mut self, builder: StakingExtBuilder) -> Self {
+		self.staking_builder = builder;
+		self
+	}
+
+	pub fn epm(mut self, builder: EpmExtBuilder) -> Self {
+		self.epm_builder = builder;
+		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)
+	}
+}
+
+// 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);
+		Timestamp::set_timestamp(System::block_number() * BLOCK_TIME + INIT_TIMESTAMP);
+
+		// 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();
+	}
+}
+
+/// 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() {
+		Period::get() * (session_index as u64)
+	} else {
+		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.
+	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, false);
+}
+
+pub(crate) fn advance_session_delayed_solution() {
+	let current_index = Session::current_index();
+	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(())
+	} else {
+		Ok(())
+	}
+}
+
+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_epm_signed() {
+	while !matches!(
+		ElectionProviderMultiPhase::current_phase(),
+		pallet_election_provider_multi_phase::Phase::Signed
+	) {
+		roll_to(System::block_number() + 1, false);
+	}
+}
+
+// Fast forward until EPM unsigned phase.
+pub fn roll_to_epm_unsigned() {
+	while !matches!(
+		ElectionProviderMultiPhase::current_phase(),
+		pallet_election_provider_multi_phase::Phase::Unsigned(_)
+	) {
+		roll_to(System::block_number() + 1, false);
+	}
+}
+
+// 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, false);
+	}
+}
+
+// Queue a solution based on the current snapshot.
+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(|e| format!("error in solution feasibility: {:?}", e))
+}
+
+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,
+	);
+}
+
+// Add offence to validator, slash it.
+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)],
+	);
+}
+
+// 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;
+		}
+	}
+}
+
+// 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
+}
+
+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(|_| ())
+}