Fix element_types_constructors split out tests

tests/html/element_types_constructors4_test.dart

Index: tests/html/element_types_constructors4_test.dart
diff --git a/tests/html/element_types_constructors4_test.dart b/tests/html/element_types_constructors4_test.dart
index c4dfb90b99fc98b1031f98ec2ac3fa983a2ff8af..38223c936adb1dca9e4b43de2ece3b93faeee9b7 100644
--- a/tests/html/element_types_constructors4_test.dart
+++ b/tests/html/element_types_constructors4_test.dart
@@ -20,17 +20,19 @@ main() {
     });
   }
 
-  check('p', () => new ParagraphElement() is ParagraphElement);
-  check('param', () => new ParamElement() is ParamElement);
-  check('pre', () => new PreElement() is PreElement);
-  check('progress', () => new ProgressElement() is ProgressElement,
-      ProgressElement.supported);
-  check('q', () => new QuoteElement() is QuoteElement);
-  check('script', () => new ScriptElement() is ScriptElement);
-  check('select', () => new SelectElement() is SelectElement);
-  check('shadow',
-      () => new ShadowElement() is ShadowElement, ShadowElement.supported);
-  check('source', () => new SourceElement() is SourceElement);
-  check('span', () => new SpanElement() is SpanElement);
-  check('style', () => new StyleElement() is StyleElement);
+  group('constructors', () {
+    check('p', () => new ParagraphElement() is ParagraphElement);
+    check('param', () => new ParamElement() is ParamElement);
+    check('pre', () => new PreElement() is PreElement);
+    check('progress', () => new ProgressElement() is ProgressElement,
+        ProgressElement.supported);
+    check('q', () => new QuoteElement() is QuoteElement);
+    check('script', () => new ScriptElement() is ScriptElement);
+    check('select', () => new SelectElement() is SelectElement);
+    check('shadow',
+        () => new ShadowElement() is ShadowElement, ShadowElement.supported);
+    check('source', () => new SourceElement() is SourceElement);
+    check('span', () => new SpanElement() is SpanElement);
+    check('style', () => new StyleElement() is StyleElement);
+  });
 }