public void start()
        {
            Assert.AreEqual(tracking, tracking.start(""));
            Assert.AreEqual(tracking.LogFilesLocation, logFolder);           // this value shouldn't change with tracking.start("")
            Assert.AreEqual(tracking, tracking.start(null));
            Assert.AreEqual(tracking.LogFilesLocation, logFolder);           // this value shouldn't change with tracking.start(null)

            //testing nulls
            Assert.IsNull((null as Tracking_Application).start(tmpFolder));
            Assert.IsNull((null as Tracking_Application).start(null));
            Assert.IsNull((null as Tracking_Application).start(""));
        }