Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/analysis_abstract.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.domain.analysis.abstract;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/domain_analysis.dart';
 import 'package:analysis_server/src/plugin/linter_plugin.dart';
 import 'package:analysis_server/src/plugin/server_plugin.dart';
 import 'package:analysis_server/src/provisional/completion/dart/completion_plugin.dart';
 import 'package:analysis_server/src/services/index/index.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/instrumentation/instrumentation.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:linter/src/plugin/linter_plugin.dart';
 import 'package:plugin/manager.dart';
 import 'package:plugin/plugin.dart';
-import 'package:unittest/unittest.dart';
+import 'package:test/test.dart';
 
 import 'mock_sdk.dart';
 import 'mocks.dart';
 
 int findIdentifierLength(String search) {
   int length = 0;
   while (length < search.length) {
     int c = search.codeUnitAt(length);
     if (!(c >= 'a'.codeUnitAt(0) && c <= 'z'.codeUnitAt(0) ||
         c >= 'A'.codeUnitAt(0) && c <= 'Z'.codeUnitAt(0) ||
@@ skipping 198 matching lines @@
   }
 
   /**
    * Completes with a successful [Response] for the given [request].
    * Otherwise fails.
    */
   Future<Response> waitResponse(Request request) async {
     return serverChannel.sendRequest(request);
   }
 }