Fix tests of Staking for Crab

frame/staking/CHANGELOG.md

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+# CHANGELOG(v2.0.0.alpha.3)
+
+## Core
+
+Some concepts should have some explaination for the changing from substrate
+
+### power
+
+power is a mixture of ring and kton.
+
++ For *RING*: `power = ring_ratio * POWER_COUNT / 2`
++ For *KTON*: `power = kton_ratio * POWER_COUNT / 2`
+
+### rebond
+
+The darwinia style `rebond` implementation.
+
+
+### withdraw
+
+What should happen after all balances being unbonded?(the locked balance)
+
+
+## Moudle
++ delete `withdraw_unbond`
++ delete `slashable_balance_of`
+
+## Structs
+
+### Exposure
+
+A snapshot of the stake backing a single validator in the system.
+
+> darwinia
+
+```rust
+#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Encode, Decode, Default, RuntimeDebug)]
+pub struct Exposure<AccountId, RingBalance, KtonBalance>
+where
+	RingBalance: HasCompact,
+	KtonBalance: HasCompact,
+{
+	#[codec(compact)]
+	pub own_ring_balance: RingBalance,
+	#[codec(compact)]
+	pub own_kton_balance: KtonBalance,
+	pub own_power: Power,
+	pub total_power: Power,
+	pub others: Vec<IndividualExposure<AccountId, RingBalance, KtonBalance>>,
+}
+```
+
+> substrate
+
+```rust
+#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Encode, Decode, Default, RuntimeDebug)]
+pub struct Exposure<AccountId, Balance: HasCompact> {
+	/// The total balance backing this validator.
+	#[codec(compact)]
+	pub total: Balance,
+	/// The validator's own stash that is exposed.
+	#[codec(compact)]
+	pub own: Balance,
+	/// The portions of nominators stashes that are exposed.
+	pub others: Vec<IndividualExposure<AccountId, Balance>>,
+}
+```
+
+### IndividualExposure
+
+The amount of exposure (to slashing) than an individual nominator has.
+
+> darwinia
+
+```rust
+#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Encode, Decode, RuntimeDebug)]
+pub struct IndividualExposure<AccountId, RingBalance, KtonBalance>
+where
+	RingBalance: HasCompact,
+	KtonBalance: HasCompact,
+{
+	who: AccountId,
+	#[codec(compact)]
+	ring_balance: RingBalance,
+	#[codec(compact)]
+	kton_balance: KtonBalance,
+	power: Power,
+}
+```
+
+> substrate
+```rust
+#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Encode, Decode, RuntimeDebug)]
+pub struct IndividualExposure<AccountId, Balance: HasCompact> {
+	/// The stash account of the nominator in question.
+	who: AccountId,
+	/// Amount of funds exposed.
+	#[codec(compact)]
+	value: Balance,
+}
+```
+
+
+### StakingLedger
+
+The ledger of a (bonded) stash.
+
++ annotated `rebond`
+
+> darwinia
+```rust
+#[derive(PartialEq, Eq, Clone, Default, Encode, Decode, RuntimeDebug)]
+pub struct StakingLedger<AccountId, RingBalance, KtonBalance, BlockNumber, Timestamp>
+where
+	RingBalance: HasCompact,
+	KtonBalance: HasCompact,
+{
+	pub stash: AccountId,
+  #[codec(compact)]
+	pub active_ring: RingBalance,
+  #[codec(compact)]
+	pub active_deposit_ring: RingBalance,
+	#[codec(compact)]
+	pub active_kton: KtonBalance,
+	pub deposit_items: Vec<TimeDepositItem<RingBalance, Timestamp>>,
+	pub ring_staking_lock: StakingLock<RingBalance, BlockNumber>,
+	pub kton_staking_lock: StakingLock<KtonBalance, BlockNumber>,
+}
+```
+
+> substrate
+
+```rust
+#[derive(PartialEq, Eq, Clone, Encode, Decode, RuntimeDebug)]
+pub struct StakingLedger<AccountId, Balance: HasCompact> {
+	pub stash: AccountId,
+	/// The total amount of the stash's balance that we are currently accounting for.
+	/// It's just `active` plus all the `unlocking` balances.
+	#[codec(compact)]
+	pub total: Balance,
+	/// The total amount of the stash's balance that will be at stake in any forthcoming
+	/// rounds.
+	#[codec(compact)]
+	pub active: Balance,
+	/// Any balance that is becoming free, which may eventually be transferred out
+	/// of the stash (assuming it doesn't get slashed first).
+	pub unlocking: Vec<UnlockChunk<Balance>>,
+}
+```