Fix element_types_constructors split out tests

tests/html/element_types_constructors1_test.dart

Index: tests/html/element_types_constructors1_test.dart
diff --git a/tests/html/element_types_constructors1_test.dart b/tests/html/element_types_constructors1_test.dart
index 2c96ee8428c54721614a424dcda585e08e4a452d..202556ac1c1a46d105bc71f40765765afb9e2ee0 100644
--- a/tests/html/element_types_constructors1_test.dart
+++ b/tests/html/element_types_constructors1_test.dart
@@ -18,23 +18,25 @@ main() {
     });
   }
 
-  check('a', () => new AnchorElement() is AnchorElement);
-  check('area', () => new AreaElement() is AreaElement);
-  check('audio', () => new AudioElement() is AudioElement);
-  check('body', () => new BodyElement() is BodyElement);
-  check('br', () => new BRElement() is BRElement);
-  check('base', () => new BaseElement() is BaseElement);
-  check('button', () => new ButtonElement() is ButtonElement);
-  check('canvas', () => new CanvasElement() is CanvasElement);
-  check('caption', () => new TableCaptionElement() is TableCaptionElement);
-  check('content',
-      () => new ContentElement() is ContentElement, ContentElement.supported);
-  check('details', () => new DetailsElement() is DetailsElement,
-      DetailsElement.supported);
-  check('datalist', () => new DataListElement() is DataListElement,
-      DataListElement.supported);
-  check('dl', () => new DListElement() is DListElement);
-  check('div', () => new DivElement() is DivElement);
-  check('embed',
-      () => new EmbedElement() is EmbedElement, EmbedElement.supported);
+  group('constructors', () {
+    check('a', () => new AnchorElement() is AnchorElement);
+    check('area', () => new AreaElement() is AreaElement);
+    check('audio', () => new AudioElement() is AudioElement);
+    check('body', () => new BodyElement() is BodyElement);
+    check('br', () => new BRElement() is BRElement);
+    check('base', () => new BaseElement() is BaseElement);
+    check('button', () => new ButtonElement() is ButtonElement);
+    check('canvas', () => new CanvasElement() is CanvasElement);
+    check('caption', () => new TableCaptionElement() is TableCaptionElement);
+    check('content',
+        () => new ContentElement() is ContentElement, ContentElement.supported);
+    check('details', () => new DetailsElement() is DetailsElement,
+        DetailsElement.supported);
+    check('datalist', () => new DataListElement() is DataListElement,
+        DataListElement.supported);
+    check('dl', () => new DListElement() is DListElement);
+    check('div', () => new DivElement() is DivElement);
+    check('embed',
+        () => new EmbedElement() is EmbedElement, EmbedElement.supported);
+  });
 }