public void EmptyStringTest2()
 {
     Assert.AreEqual(ReversePolishNotation.GetReversePolishNotation(" "), 0);
 }
 public void TestMethod1()
 {
     Assert.AreEqual(ReversePolishNotation.GetReversePolishNotation("5 1 2 + 4 * + 3 -"), 14);
 }
 public void GetException()
 {
     Assert.ThrowsException <ArgumentException>(() => ReversePolishNotation.GetReversePolishNotation("5 1 2+ 4 * + 3 -"));
 }