Format all tests.

tests/lib_strong/html/htmlelement_test.dart

Index: tests/lib_strong/html/htmlelement_test.dart
diff --git a/tests/lib_strong/html/htmlelement_test.dart b/tests/lib_strong/html/htmlelement_test.dart
index 10b0070f4e33009bf711f639fbcdea272307d5ea..12967a1aa3ad205d6dd4d9f947debcab4e43dd10 100644
--- a/tests/lib_strong/html/htmlelement_test.dart
+++ b/tests/lib_strong/html/htmlelement_test.dart
@@ -59,11 +59,11 @@ main() {
     expect(div.dataset.putIfAbsent('bar', f), 'bar-value');
     expect(hasBeenInvoked, isFalse);
 
-    final keys = <String> [];
-    final values = <String> [];
+    final keys = <String>[];
+    final values = <String>[];
     div.dataset.forEach((String key, String value) {
-        keys.add(key);
-        values.add(value);
+      keys.add(key);
+      values.add(value);
     });
     expect(keys, unorderedEquals(['foo', 'bar']));
     expect(values, unorderedEquals(['foo-value', 'bar-value']));