Start cleaning up the HTML tests.

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

Index: pkg/dev_compiler/test/codegen/lib/html/exceptions_test.dart
diff --git a/pkg/dev_compiler/test/codegen/lib/html/exceptions_test.dart b/pkg/dev_compiler/test/codegen/lib/html/exceptions_test.dart
index d7603b90f90179daad62240ab3547f1aa224580a..47e2a2840c79f9bff688472935739311478c81f0 100644
--- a/pkg/dev_compiler/test/codegen/lib/html/exceptions_test.dart
+++ b/pkg/dev_compiler/test/codegen/lib/html/exceptions_test.dart
@@ -1,11 +1,8 @@
-library ExceptionsTest;
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_config.dart';
 import 'dart:html';
 
-main() {
-  useHtmlConfiguration();
+import 'package:minitest/minitest.dart';
 
+main() {
   test('EventException', () {
     final event = new Event('Event');
     // Intentionally do not initialize it!