@Test
 public void ifNoneMatch() {
   String ifNoneMatch = "\"v2.6\"";
   headers.setIfNoneMatch(ifNoneMatch);
   assertEquals("Invalid If-None-Match header", ifNoneMatch, headers.getIfNoneMatch().get(0));
   assertEquals("Invalid If-None-Match header", "\"v2.6\"", headers.getFirst("If-None-Match"));
 }
 @Test
 public void ifNoneMatchList() {
   String ifNoneMatch1 = "\"v2.6\"";
   String ifNoneMatch2 = "\"v2.7\"";
   List<String> ifNoneMatchList = new ArrayList<String>(2);
   ifNoneMatchList.add(ifNoneMatch1);
   ifNoneMatchList.add(ifNoneMatch2);
   headers.setIfNoneMatch(ifNoneMatchList);
   assertEquals("Invalid If-None-Match header", ifNoneMatchList, headers.getIfNoneMatch());
   assertEquals(
       "Invalid If-None-Match header", "\"v2.6\", \"v2.7\"", headers.getFirst("If-None-Match"));
 }