public async void Withdraw_Valid_Amount()
{
WithdrawMessage command = new WithdrawMessage()
{
AccountId = Guid.NewGuid(),
Amount = 600
};
Account account = Substitute.For <Account>();
account.Deposit(Credit.Create(Amount.Create(1000)));
accountReadOnlyRepository
.Get(command.AccountId)
.Returns(account);
Withdraw sut = new Withdraw(
accountReadOnlyRepository,
accountWriteOnlyRepository);
Debit debit = await sut.Handle(command);
Assert.Equal(command.Amount, debit.Amount.Value);
Assert.Equal("Debit", debit.Description);
Assert.True(debit.Id != Guid.Empty);
}