Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/services/index/index_test.dart

 // Copyright (c) 2016, 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.
 
 import 'package:analysis_server/src/services/index/index.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/summary/idl.dart';
+import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 import 'package:typed_mock/typed_mock.dart';
-import 'package:unittest/unittest.dart';
 
 import '../../abstract_single_unit.dart';
 import '../../utils.dart';
 
 main() {
   initializeTestEnvironment();
-  defineReflectiveTests(IndexTest);
+  defineReflectiveSuite(() {
+    defineReflectiveTests(IndexTest);
+  });
 }
 
 @reflectiveTest
 class IndexTest extends AbstractSingleUnitTest {
   Index index = createMemoryIndex();
 
   /**
    * Return the [Location] with given properties, or fail.
    */
   Location findLocation(List<Location> locations, String libraryUri,
@@ skipping 338 matching lines @@
   Source _indexUnit(String path, String code) {
     Source source = addSource(path, code);
     CompilationUnit unit = resolveLibraryUnit(source);
     index.indexUnit(unit);
     return source;
   }
 }
 
 class _CompilationUnitElementMock extends TypedMock
     implements CompilationUnitElement {}