public void ValidationTest_TError(RequirableObject testSubject, params string[] expected)
        {
            var actual = validatorWithError.Validate(testSubject);

            Assert.Equal(expected, actual.Errors);
        }
        public void ValidationTest(RequirableObject testSubject, bool expected)
        {
            var actual = validator.Validate(testSubject);

            Assert.Equal(expected, actual);
        }