Format all tests.

tests/html/audioelement_test.dart

 library AudioElementTest;
+
 import 'package:unittest/unittest.dart';
 import 'package:unittest/html_config.dart';
 import 'dart:html';
 
 main() {
   useHtmlConfiguration();
 
   test('constructorTest1', () {
-      var audio = new AudioElement();
-      expect(audio, isNotNull);
-      expect(audio is AudioElement, isTrue);
-    });
+    var audio = new AudioElement();
+    expect(audio, isNotNull);
+    expect(audio is AudioElement, isTrue);
+  });
 
   test('constructorTest2', () {
-      var audio = new AudioElement('IntentionallyMissingFileURL');
-      expect(audio, isNotNull);
-      expect(audio is AudioElement, isTrue);
-      expect(audio.src, contains('IntentionallyMissingFileURL'));
-    });
+    var audio = new AudioElement('IntentionallyMissingFileURL');
+    expect(audio, isNotNull);
+    expect(audio is AudioElement, isTrue);
+    expect(audio.src, contains('IntentionallyMissingFileURL'));
+  });
 
   test('canPlayTypeTest', () {
-      var audio = new AudioElement();
-      var canPlay = audio.canPlayType("audio/mp4");
-      expect(canPlay, isNotNull);
-      expect(canPlay is String, isTrue);
-    });
+    var audio = new AudioElement();
+    var canPlay = audio.canPlayType("audio/mp4");
+    expect(canPlay, isNotNull);
+    expect(canPlay is String, isTrue);
+  });
 }