Start cleaning up the HTML tests.

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

Index: pkg/dev_compiler/test/codegen/lib/html/custom_tags_test.dart
diff --git a/pkg/dev_compiler/test/codegen/lib/html/custom_tags_test.dart b/pkg/dev_compiler/test/codegen/lib/html/custom_tags_test.dart
index 5f5457b5f27d20b41e1ab4fac95e6dbe51155b30..60848fdf46ba0f9d033b6207ba68bd0670fba6ad 100644
--- a/pkg/dev_compiler/test/codegen/lib/html/custom_tags_test.dart
+++ b/pkg/dev_compiler/test/codegen/lib/html/custom_tags_test.dart
@@ -2,15 +2,13 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library custom_tags_test;
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_config.dart';
 import 'dart:html';
+
+import 'package:minitest/minitest.dart';
+
 import 'utils.dart';
 
 main() {
-  useHtmlConfiguration();
-
   test('create via custom tag', () {
     var element = new Element.tag('x-basic1')..id = 'basic1';
     document.body.nodes.add(element);