public void trim_non_digits_zero_length()
{
CreditCardDerived ccd = new CreditCardDerived();
string text = "";
string expected = "";
string actual = ccd.TrimNotDigits_ForUnitTest(text);
Assert.AreEqual(expected, actual);
}
public void trim_non_digits()
{
CreditCardDerived ccd = new CreditCardDerived();
string text = "tga12341234ytm";
string expected = "12341234";
string actual = ccd.TrimNotDigits_ForUnitTest(text);
Assert.AreEqual(expected, actual);
}
public void trim_non_digits_big_text()
{
// This test was written when the function was refactored for performance. This test
// should take no more than 1 second to run. Previously it was taking 21 seconds to run.
int repeat = 10000;
CreditCardDerived ccd = new CreditCardDerived();
string lotsOfCharacters = String.Join("", Enumerable.Repeat("abcdef", repeat).ToArray());
string text = lotsOfCharacters + "1" + lotsOfCharacters;
string expected = "1";
string actual = ccd.TrimNotDigits_ForUnitTest(text);
Assert.AreEqual(expected, actual);
}