public void AddFalseValidationPredicate()
{
// Arrange.
ValidatableArgument<bool> argument = new ValidatableArgument<bool>("argument", true);
// Act.
argument.IsFalse();
// Assert.
Assert.AreEqual(1, argument.ValidationPredicates.Count());
Assert.IsInstanceOfType(argument.ValidationPredicates.First(), typeof(FalseValidationPredicate));
}