Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/services/completion/dart/inherited_reference_contributor_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.inherited_ref;
 
 import 'package:analysis_server/src/protocol_server.dart';
 import 'package:analysis_server/src/provisional/completion/dart/completion_dart.dart';
 import 'package:analysis_server/src/services/completion/dart/inherited_reference_contributor.dart';
+import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
-import 'package:unittest/unittest.dart';
 
 import '../../../utils.dart';
 import 'completion_contributor_util.dart';
 
 main() {
   initializeTestEnvironment();
-  defineReflectiveTests(InheritedContributorTest);
+  defineReflectiveSuite(() {
+    defineReflectiveTests(InheritedContributorTest);
+  });
 }
 
 @reflectiveTest
 class InheritedContributorTest extends DartCompletionContributorTest {
   @override
   bool get isNullExpectedReturnTypeConsideredDynamic => false;
 
   @override
   DartCompletionContributor createContributor() {
     return new InheritedReferenceContributor();
@@ skipping 581 matching lines @@
     assertNotSuggested('foo');
     assertNotSuggested('A');
     assertNotSuggested('x');
     assertNotSuggested('y');
     assertNotSuggested('x1');
     assertNotSuggested('y1');
     assertNotSuggested('x2');
     assertNotSuggested('y2');
   }
 }