Start cleaning up the HTML tests.

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

Index: pkg/dev_compiler/test/codegen/lib/html/audiobuffersourcenode_test.dart
diff --git a/pkg/dev_compiler/test/codegen/lib/html/audiobuffersourcenode_test.dart b/pkg/dev_compiler/test/codegen/lib/html/audiobuffersourcenode_test.dart
index c55c08c03f8c264c63cb23c3e67020d74c2a9be8..237aa3ce6766d7453422184b1c1562cf7a437d57 100644
--- a/pkg/dev_compiler/test/codegen/lib/html/audiobuffersourcenode_test.dart
+++ b/pkg/dev_compiler/test/codegen/lib/html/audiobuffersourcenode_test.dart
@@ -1,21 +1,17 @@
-library AudioBufferSourceNodeTest;
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_individual_config.dart';
 import 'dart:web_audio';
 
-main() {
-
-  useHtmlIndividualConfiguration();
+import 'package:minitest/minitest.dart';
 
+main() {
   group('supported', () {
     test('supported', () {
-      expect(AudioContext.supported, true);
+      expect(AudioContext.supported, isTrue);
     });
   });
 
   group('functional', () {
     test('createBuffer', () {
-      if(AudioContext.supported) {
+      if (AudioContext.supported) {
         var ctx = new AudioContext();
         AudioBufferSourceNode node = ctx.createBufferSource();
         expect(node is AudioBufferSourceNode, isTrue);