Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/services/correction/change_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // 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 test.services.correction.change;
 
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/protocol_server.dart';
 import 'package:analyzer/src/generated/source.dart';
+import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
-import 'package:unittest/unittest.dart';
 
 import '../../utils.dart';
 
 main() {
   initializeTestEnvironment();
-  defineReflectiveTests(ChangeTest);
-  defineReflectiveTests(EditTest);
-  defineReflectiveTests(FileEditTest);
-  defineReflectiveTests(LinkedEditGroupTest);
-  defineReflectiveTests(LinkedEditSuggestionTest);
-  defineReflectiveTests(PositionTest);
+  defineReflectiveSuite(() {
+    defineReflectiveTests(ChangeTest);
+    defineReflectiveTests(EditTest);
+    defineReflectiveTests(FileEditTest);
+    defineReflectiveTests(LinkedEditGroupTest);
+    defineReflectiveTests(LinkedEditSuggestionTest);
+    defineReflectiveTests(PositionTest);
+  });
 }
 
 @reflectiveTest
 class ChangeTest {
   void test_addEdit() {
     SourceChange change = new SourceChange('msg');
     SourceEdit edit1 = new SourceEdit(1, 2, 'a');
     SourceEdit edit2 = new SourceEdit(1, 2, 'b');
     expect(change.edits, hasLength(0));
     change.addEdit('/a.dart', 0, edit1);
@@ skipping 257 matching lines @@
     expect(position.offset, 1);
     expect(position.toString(), '{"file":"/test.dart","offset":1}');
   }
 
   void test_toJson() {
     Position position = new Position('/test.dart', 1);
     var expectedJson = {FILE: '/test.dart', OFFSET: 1};
     expect(position.toJson(), expectedJson);
   }
 }