public void ReturnTrueAndMatchMessage_WhenBoundIsNullAndArgumentIsNull()
{
// Arrange.
EqualValidationPredicate<string> validationPredicate = new EqualValidationPredicate<string>(null);
// Act.
IValidationPredicateResult result = validationPredicate.Match(null);
// Assert.
Assert.IsTrue(result.IsMatch);
Assert.AreEqual("The argument is equal to <null>.", result.Message);
}