Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/search/member_references_test.dart

Index: pkg/analysis_server/test/search/member_references_test.dart
diff --git a/pkg/analysis_server/test/search/member_references_test.dart b/pkg/analysis_server/test/search/member_references_test.dart
index 23ea1c72af672aa2d205a021963b3c970e6af5eb..5ddab50d542ffd3aa5923cc248f442d61f890200 100644
--- a/pkg/analysis_server/test/search/member_references_test.dart
+++ b/pkg/analysis_server/test/search/member_references_test.dart
@@ -7,15 +7,17 @@ library test.search.member_references;
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
+import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
-import 'package:unittest/unittest.dart';
 
 import '../utils.dart';
 import 'abstract_search_domain.dart';
 
 main() {
   initializeTestEnvironment();
-  defineReflectiveTests(MemberReferencesTest);
+  defineReflectiveSuite(() {
+    defineReflectiveTests(MemberReferencesTest);
+  });
 }
 
 @reflectiveTest