public void ShouldNotThrowException_WhenSufficientFundsAreAvailable()
{
Account sut = new AccountBuilder().WithBalance(10m);
Assert.DoesNotThrow(() => { sut.EnsureSufficientFundsAreAvailable(5m); });
}
public void ShouldThrowException_WhenInsufficientFundsAreAvailable()
{
Account sut = new AccountBuilder().WithBalance(10m);
Assert.Throws <InvalidOperationException>(() => { sut.EnsureSufficientFundsAreAvailable(20m); });
}