Function shelve_success
pub fn shelve_success<T, AccountId>()where
    T: Mutate<AccountId>,
    <T as Inspect<AccountId>>::Balance: AtLeast8BitUnsigned + Debug,
    AccountId: AtLeast8BitUnsigned,Expand description
Test Mutate::shelve for successful shelving.
This test verifies that shelving an amount from an account reduces the account balance and total issuance values by the shelved amount.