update elements and fix some bugs

test/iron_media_query_test.dart

Index: test/iron_media_query_test.dart
diff --git a/test/iron_media_query_test.dart b/test/iron_media_query_test.dart
index 84e511b65aa23fd8fdc4fde1d69079e7929e29c2..defd617fd649af003ac7e6e4119094b492ade63a 100644
--- a/test/iron_media_query_test.dart
+++ b/test/iron_media_query_test.dart
@@ -4,6 +4,7 @@
 @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';
@@ -39,6 +40,42 @@ main() async {
         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);
+      });
     });
   });
 }