public void CommonFunctionsCalculateTest()
{
Assert.AreEqual(5, CommonFunctions.Calculate("2 + 3"), "2 + 3 = 5");
Assert.AreEqual(2.5, CommonFunctions.Calculate("5 / 2"), "5 / 2 = 2.5");
Assert.AreEqual(2d, CommonFunctions.Calculate("6 / 3"), "6 / 3 = 2");
Assert.AreEqual(2, CommonFunctions.Calculate("8 % 3"), "8 % 3 = 2");
Assert.AreEqual(3, CommonFunctions.Calculate("len('abc')"), "len('abc') = 3");
}