public void Format_WhenInvalid_MessageContainsFormat()
{
const string INPUT = "aa";
const string FORMAT = @"\d\d";
const string EXPECTED_RESULT = "String 'aa' was not in correct format [\\d\\d].";
TextFormatValidator validator = new TextFormatValidator(FORMAT);
validator.IsValid(INPUT);
ValidationError error = validator.GetErrors()[0];
Assert.AreEqual(EXPECTED_RESULT, error.Message);
}
