public void AssertCanCheckPhoneNumber()
        {
            var validator = new PeopleModelValidatorAttribute();

            Assert.IsFalse(validator.IsValidPhoneNumber("123"));
            Assert.IsTrue(validator.IsValidPhoneNumber("123-123-1234"));
        }
        public void AssertCanCheckModelForEmptyValues()
        {
            var validator = new PeopleModelValidatorAttribute();

            Assert.IsFalse(validator.ContainsEmptyProperty(new Person
            {
                LastName  = "Hello LAst",
                FirstName = "Hello First",
                Phone     = "123-123-1234"
            }));
            Assert.IsTrue(validator.ContainsEmptyProperty(new Person()));
        }