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fungible::Unbalanced::decrease_balance: Handle precision properly (#2823)

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This commit is contained in:
Bastian Köcher
2024-01-05 19:55:32 +01:00
committed by GitHub
parent 19de1c9660
commit 1c95310a66
3 changed files with 46 additions and 3 deletions
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substrate/frame/balances/src/tests/fungible_tests.rs
+26 -1
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@@ -146,7 +146,7 @@ fn unbalanced_trait_decrease_balance_works_2() {
assert_eq!(Balances::total_balance_on_hold(&1337), 60);
assert_noop!(
Balances::decrease_balance(&1337, 40, Exact, Expendable, Polite),
Error::<Test>::InsufficientBalance
TokenError::FundsUnavailable
);
assert_eq!(Balances::decrease_balance(&1337, 39, Exact, Expendable, Polite), Ok(39));
assert_eq!(<Balances as fungible::Inspect<_>>::balance(&1337), 1);
@@ -468,3 +468,28 @@ fn emit_events_with_changing_freezes() {
assert_eq!(events(), [RuntimeEvent::Balances(crate::Event::Thawed { who: 1, amount: 15 })]);
});
}
#[test]
fn withdraw_precision_exact_works() {
ExtBuilder::default()
.existential_deposit(1)
.monied(true)
.build_and_execute_with(|| {
assert_ok!(Balances::set_freeze(&TestId::Foo, &1, 10));
assert_eq!(Balances::account(&1).free, 10);
assert_eq!(Balances::account(&1).frozen, 10);
// `BestEffort` will not reduce anything
assert_ok!(<Balances as fungible::Balanced<_>>::withdraw(
&1, 5, BestEffort, Preserve, Polite
));
assert_eq!(Balances::account(&1).free, 10);
assert_eq!(Balances::account(&1).frozen, 10);
assert_noop!(
<Balances as fungible::Balanced<_>>::withdraw(&1, 5, Exact, Preserve, Polite),
TokenError::FundsUnavailable
);
});
}