public void AddLessThanOrEqualValidationPredicate_WhenArgumentIsInt()
{
// Arrange.
ValidatableArgument<int> argument = new ValidatableArgument<int>("argument", 3);
// Act.
argument.IsLessThanOrEqual(5);
// Assert.
Assert.AreEqual(1, argument.ValidationPredicates.Count());
Assert.IsInstanceOfType(argument.ValidationPredicates.First(), typeof(LessThanOrEqualValidationPredicate<int>));
}