Start cleaning up the HTML tests.

pkg/dev_compiler/test/codegen/lib/html/audioelement_test.dart

Index: pkg/dev_compiler/test/codegen/lib/html/audioelement_test.dart
diff --git a/pkg/dev_compiler/test/codegen/lib/html/audioelement_test.dart b/pkg/dev_compiler/test/codegen/lib/html/audioelement_test.dart
index 9957ff703e2fadacc2272e733b66be950d2f8d29..188932ebe5cf2f29adcbac88ae6f4989589a2afe 100644
--- a/pkg/dev_compiler/test/codegen/lib/html/audioelement_test.dart
+++ b/pkg/dev_compiler/test/codegen/lib/html/audioelement_test.dart
@@ -1,11 +1,8 @@
-library AudioElementTest;
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_config.dart';
 import 'dart:html';
 
-main() {
-  useHtmlConfiguration();
+import 'package:minitest/minitest.dart';
 
+main() {
   test('constructorTest1', () {
       var audio = new AudioElement();
       expect(audio, isNotNull);
@@ -16,7 +13,7 @@ main() {
       var audio = new AudioElement('IntentionallyMissingFileURL');
       expect(audio, isNotNull);
       expect(audio is AudioElement, isTrue);
-      expect(audio.src, contains('IntentionallyMissingFileURL'));
+      expect(audio.src.contains('IntentionallyMissingFileURL'), isTrue);
     });
 
   test('canPlayTypeTest', () {