update elements and fix some bugs

test/iron_media_query_test.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 @TestOn('browser')
 library polymer_elements.test.iron_media_query_test;
 
+import 'package:polymer_interop/polymer_interop.dart';
 import 'package:polymer_elements/iron_media_query.dart';
 import 'package:test/test.dart';
 import 'package:web_components/web_components.dart';
 import 'common.dart';
 
 main() async {
   await initWebComponents();
 
   group('basic', () {
     IronMediaQuery mq;
@@ skipping 15 matching lines @@
 
       test('small max-width value', () {
         mq.mediaQuery = '(max-width: 1px)';
         expect(mq.queryMatches, false);
       });
 
       test('large max-width value', () {
         mq.mediaQuery = '(max-width: 10000px)';
         expect(mq.queryMatches, true);
       });
+    
+      test('automatically wrap with parens', () {
+        mq.mediaQuery = 'min-width: 1px';
+        expect(mq.queryMatches, true);
+      });
+  
+      group('query does not activate on empty string or null', () {
+  
+        test('empty string', () {
+          mq.mediaQuery = '';
+          expect(mq.jsElement['_mq'], isNull);
+        });
+  
+        test('null', () {
+          mq.mediaQuery = null;
+          expect(mq.jsElement['_mq'], isNull);
+        });
+  
+      });
+  
+      test('media query destroys on detach', () {
+        mq.mediaQuery = '(max-width: 800px)';
+        mq.remove();
+        PolymerDom.flush();
+        expect(mq.jsElement['_mq'], isNull);
+      });
+  
+      test('media query re-enables on attach', () {
+        mq.mediaQuery = '(max-width: 800px)';
+        var parent = mq.parentNode;
+        mq.remove();
+        PolymerDom.flush();
+        parent.append(mq);
+        PolymerDom.flush();
+        expect(mq.jsElement['_mq'], isNotNull);
+      });
     });
   });
 }