public void ShouldReduceBalance()
{
Account sut = new AccountBuilder().WithBalance(1000m);
sut.Debit(250m);
var expected = 750m;
Assert.AreEqual(expected, sut.Balance);
}
public void ShouldReduceWithdrawn()
{
Account sut = new AccountBuilder().WithWithdrawn(0m);
sut.Debit(250m);
var expected = -250m;
Assert.AreEqual(expected, sut.Withdrawn);
}