public void TestLowerNull()
        {
            var function = new ToLowerCaseFunction();

            Assert.That(function.Evaluate(new string[1]), Is.EqualTo(""));
        }
        public void TestNothingToLower()
        {
            var function = new ToLowerCaseFunction();

            Assert.That(function.Evaluate("some text"), Is.EqualTo("some text"));
        }
        public void TestLowerEmpty()
        {
            var function = new ToLowerCaseFunction();

            Assert.That(function.Evaluate(""), Is.EqualTo(""));
        }