pkg/unittest: test cleanup

pkg/unittest/test/async_exception_test.dart

Index: pkg/unittest/test/async_exception_test.dart
diff --git a/pkg/unittest/test/unittest_async_exception_test.dart b/pkg/unittest/test/async_exception_test.dart
similarity index 81%
rename from pkg/unittest/test/unittest_async_exception_test.dart
rename to pkg/unittest/test/async_exception_test.dart
index cc351169debb8aee01d16c735e75e39e843541ba..85744165d797b30e1a00f576a4dfaaa4d3624727 100644
--- a/pkg/unittest/test/unittest_async_exception_test.dart
+++ b/pkg/unittest/test/async_exception_test.dart
@@ -3,11 +3,13 @@
 // BSD-style license that can be found in the LICENSE file.
 
 library unittestTest;
-import 'dart:isolate';
+
 import 'dart:async';
+import 'dart:isolate';
+
 import 'package:unittest/unittest.dart';
 
-part 'unittest_test_utils.dart';
+part 'utils.dart';
 
 var testName = 'async exception test';
 
@@ -18,4 +20,4 @@ var testFunction = (_) {
   });
 };
 
-var expected = buildStatusString(0, 1, 0, testName, message: 'Caught error!');
+final expected = buildStatusString(0, 1, 0, testName, message: 'Caught error!');