public void CalculateCheckDigits_Zeroes()
{
var expected = 0;
var actual = Luhn.CalculateCheckDigit("000000");
actual.Should().Be(expected);
}
public void CalculateCheckDigits_CC3()
{
var expected = 1;
var actual = Luhn.CalculateCheckDigit("411111111111111");
actual.Should().Be(expected);
}
public void CalculateCheckDigits_Simple1()
{
var expected = 9;
var actual = Luhn.CalculateCheckDigit("456396012200199");
actual.Should().Be(expected);
}
public void CalculateCheckDigits_CC1()
{
var expected = 1;
var actual = Luhn.CalculateCheckDigit("37144963539843");
actual.Should().Be(expected);
}
public void CalculateCheckDigits_BadCharsFail()
{
Action action = () => Luhn.CalculateCheckDigit("123ABC456");
action.ShouldThrowArgumentException();
}
public void CalculateCheckDigits_EmptyFails()
{
Action action = () => Luhn.CalculateCheckDigit("");
action.ShouldThrowArgumentException();
}
public void CalculateCheckDigits_NullFails()
{
Action action = () => Luhn.CalculateCheckDigit(null);
action.ShouldThrowArgumentNullException();
}
public void CalculateCheckDigit_NullString_ArgumentNullException()
{
string number = null;
Assert.That(() => Luhn.CalculateCheckDigit(number), Throws.ArgumentNullException);
}
public void CalulateCheckDigit_ValidNumber_CheckDigit(string number, byte expected)
{
var checkDigit = Luhn.CalculateCheckDigit(number);
Assert.That(checkDigit, Is.EqualTo(expected));
}
public void CalculateCheckDigit_InvalidString_Exception()
{
Assert.That(() => Luhn.CalculateCheckDigit("abc"), Throws.Exception);
}
public void CalculateCheckDigit_WhiteSpaceString_ArgumentNullException()
{
Assert.That(() => Luhn.CalculateCheckDigit(" "), Throws.ArgumentNullException);
}
