@Test public void testExpirationDate() { MyResponse r = new MyResponse(c); Cookie co = new Cookie("1", "1"); System.out.println(r.getExpirationDate(co)); Calendar now = Calendar.getInstance(); SimpleDateFormat df = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss z", Locale.US); df.setTimeZone(TimeZone.getTimeZone("GMT")); String date1 = df.format(now.getTimeInMillis()); assertEquals(r.getExpirationDate(co), date1); }