Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/services/completion/dart/optype_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.completion.contributor.dart.optype;
 
 import 'package:analysis_server/src/protocol_server.dart';
 import 'package:analysis_server/src/provisional/completion/dart/completion_target.dart';
 import 'package:analysis_server/src/services/completion/dart/optype.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:plugin/manager.dart';
+import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
-import 'package:unittest/unittest.dart';
 
 import '../../../abstract_context.dart';
 import '../../../utils.dart';
 
 main() {
   initializeTestEnvironment();
-  defineReflectiveTests(OpTypeTest);
+  defineReflectiveSuite(() {
+    defineReflectiveTests(OpTypeTest);
+  });
 }
 
 @reflectiveTest
 class OpTypeTest {
   OpType visitor;
 
   void addTestSource(String content, {bool resolved: false}) {
     int offset = content.indexOf('^');
     expect(offset, isNot(equals(-1)), reason: 'missing ^');
     int nextOffset = content.indexOf('^', offset + 1);
@@ skipping 1537 matching lines @@
   String get shortName => fullName;
 
   @override
   Source get source => this;
 
   @override
   Uri get uri => new Uri.file(fullName);
 
   noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
 }