public void GetValueTest()
        {
            var value = new ConcatFunctionValue(new List<IValue> { new StringValue("Hello"), new StringValue("World!") });
            var theString = value.GetValue(new Mock<IYateDataContext>().Object);

            Assert.AreEqual("HelloWorld!", theString);
        }
        public void GetValueNoneTest()
        {
            var value = new ConcatFunctionValue(new List<IValue>());
            var theString = value.GetValue(new Mock<IYateDataContext>().Object);

            Assert.AreEqual("", theString);
        }