public void With_valid_iban_format_should_succeed(IbanFormat format, string expected)
{
// Act
string actual = _iban.ToString(format);
// Assert
actual.Should().Be(expected);
}
public void With_invalid_iban_format_should_throw()
{
const IbanFormat format = (IbanFormat)int.MaxValue;
// Act
Action act = () => _iban.ToString(format);
// Assert
act.Should()
.Throw <ArgumentException>("the provided format was invalid")
.Which.ParamName.Should()
.Be(nameof(format));
}