public void ShoulBuildQueryString() { // arrange Transaction tx = new Transaction { Tx = "ABC", Amount = "123" }; // act QueryString qs = tx.ToPdtQueryString(); // assert Assert.AreEqual(7, qs.Count); Assert.AreEqual("?tx=ABC&st=&amt=123&cc=&cm=&item_number=&business=", qs.ToString()); }