public void TestAdd()
 {
     Assert.AreEqual("10a", DynamicUtils.BinaryOperation_Add(10, "a"));
     Assert.AreEqual("a", DynamicUtils.BinaryOperation_Add(null, "a"));
     Assert.AreEqual("a", DynamicUtils.BinaryOperation_Add("a", null));
     Assert.AreEqual(null, DynamicUtils.BinaryOperation_Add(null, null));
     Assert.AreEqual(21.5, DynamicUtils.BinaryOperation_Add(10, 11.5));
 }