@Test
 public void test_timeDiffInMs() {
   tD1 = Values.timeDiffInS(1);
   tD2 = Values.timeDiffInMs(1000);
   tD4 = Values.timeDiffInS(3);
   tD3 = Values.timeDiffInMs(3000);
   assertEquals(tD1, tD2);
   assertEquals(tD4, tD3);
 }