Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/protocol_test.dart

Index: pkg/analysis_server/test/protocol_test.dart
diff --git a/pkg/analysis_server/test/protocol_test.dart b/pkg/analysis_server/test/protocol_test.dart
index 6428c62020b39d0a66beecdb2cb82ef24b8ea1d2..9c27ba46cc811db6c4d98259af4f7f63ce7e6e92 100644
--- a/pkg/analysis_server/test/protocol_test.dart
+++ b/pkg/analysis_server/test/protocol_test.dart
@@ -9,17 +9,19 @@ import 'dart:convert';
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/protocol/protocol_internal.dart';
+import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
-import 'package:unittest/unittest.dart';
 
 import 'utils.dart';
 
 main() {
   initializeTestEnvironment();
-  defineReflectiveTests(NotificationTest);
-  defineReflectiveTests(RequestTest);
-  defineReflectiveTests(RequestErrorTest);
-  defineReflectiveTests(ResponseTest);
+  defineReflectiveSuite(() {
+    defineReflectiveTests(NotificationTest);
+    defineReflectiveTests(RequestTest);
+    defineReflectiveTests(RequestErrorTest);
+    defineReflectiveTests(ResponseTest);
+  });
 }
 
 Matcher _throwsRequestFailure = throwsA(new isInstanceOf<RequestFailure>());