tests.rs

		// // If 10 gets slashed now, despite having +1000 in stash, it will be slashed byt 79, which is the slot stake
		Staking::on_offline_validator(10, 4);
		// // Confirm user has been reported
		assert_eq!(Staking::slash_count(&10), 4);
		// // check the balance of 10 (slash will be deducted from free balance.)
		assert_eq!(Balances::free_balance(&10), 1000 - 79);
		
	});
}


#[test]
fn on_free_balance_zero_stash_removes_validator() {
	// Tests that validator storage items are cleaned up when stash is empty
	// Tests that storage items are untouched when controller is empty
	with_externalities(&mut ExtBuilder::default()
		.existential_deposit(10)
		.build(),
	|| {
		// Check that account 10 is a validator
		assert!(<Validators<Test>>::exists(10));
		// Check the balance of the validator account
		assert_eq!(Balances::free_balance(&10), 256); 
		// Check the balance of the stash account
		assert_eq!(Balances::free_balance(&11), 256000); 
		// Check these two accounts are bonded
		assert_eq!(Staking::bonded(&11), Some(10));

		// Set some storage items which we expect to be cleaned up
		// Initiate slash count storage item
		Staking::on_offline_validator(10, 1);
		// Set payee information
		assert_ok!(Staking::set_payee(Origin::signed(10), RewardDestination::Stash));

		// Check storage items that should be cleaned up
		assert!(<Ledger<Test>>::exists(&10));
		assert!(<Validators<Test>>::exists(&10));
		assert!(<SlashCount<Test>>::exists(&10));
		assert!(<Payee<Test>>::exists(&10));

		// Reduce free_balance of controller to 0
		Balances::set_free_balance(&10, 0);
		// Check total balance of account 10
		assert_eq!(Balances::total_balance(&10), 0); 

		// Check the balance of the stash account has not been touched
		assert_eq!(Balances::free_balance(&11), 256000); 
		// Check these two accounts are still bonded
		assert_eq!(Staking::bonded(&11), Some(10));

		// Check storage items have not changed
		assert!(<Ledger<Test>>::exists(&10));
		assert!(<Validators<Test>>::exists(&10));
		assert!(<SlashCount<Test>>::exists(&10));
		assert!(<Payee<Test>>::exists(&10));

		// Reduce free_balance of stash to 0
		Balances::set_free_balance(&11, 0);
		// Check total balance of stash
		assert_eq!(Balances::total_balance(&11), 0); 

		// Check storage items do not exist
		assert!(!<Ledger<Test>>::exists(&10));
		assert!(!<Validators<Test>>::exists(&10));
		assert!(!<Nominators<Test>>::exists(&10));
		assert!(!<SlashCount<Test>>::exists(&10));
		assert!(!<Payee<Test>>::exists(&10));
		assert!(!<Bonded<Test>>::exists(&11));
	});
}

#[test]
fn on_free_balance_zero_stash_removes_nominator() {
	// Tests that nominator storage items are cleaned up when stash is empty
	// Tests that storage items are untouched when controller is empty
	with_externalities(&mut ExtBuilder::default()
		.existential_deposit(10)
		.build(),
	|| {
		// Make 10 a nominator
		assert_ok!(Staking::nominate(Origin::signed(10), vec![20]));
		// Check that account 10 is a nominator
		assert!(<Nominators<Test>>::exists(10));
		// Check the balance of the nominator account
		assert_eq!(Balances::free_balance(&10), 256); 
		// Check the balance of the stash account
		assert_eq!(Balances::free_balance(&11), 256000); 
		// Check these two accounts are bonded
		assert_eq!(Staking::bonded(&11), Some(10));

		// Set payee information
		assert_ok!(Staking::set_payee(Origin::signed(10), RewardDestination::Stash));


		// Check storage items that should be cleaned up
		assert!(<Ledger<Test>>::exists(&10));
		assert!(<Nominators<Test>>::exists(&10));
		assert!(<Payee<Test>>::exists(&10));

		// Reduce free_balance of controller to 0
		Balances::set_free_balance(&10, 0);
		// Check total balance of account 10
		assert_eq!(Balances::total_balance(&10), 0); 

		// Check the balance of the stash account has not been touched
		assert_eq!(Balances::free_balance(&11), 256000); 
		// Check these two accounts are still bonded
		assert_eq!(Staking::bonded(&11), Some(10));

		// Check storage items have not changed
		assert!(<Ledger<Test>>::exists(&10));
		assert!(<Nominators<Test>>::exists(&10));
		assert!(<Payee<Test>>::exists(&10));

		// Reduce free_balance of stash to 0
		Balances::set_free_balance(&11, 0);
		// Check total balance of stash
		assert_eq!(Balances::total_balance(&11), 0); 

		// Check storage items do not exist
		assert!(!<Ledger<Test>>::exists(&10));
		assert!(!<Validators<Test>>::exists(&10));
		assert!(!<Nominators<Test>>::exists(&10));
		assert!(!<SlashCount<Test>>::exists(&10));
		assert!(!<Payee<Test>>::exists(&10));
		assert!(!<Bonded<Test>>::exists(&11));
	});
}