Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/analysis/notification_errors_test.dart

Index: pkg/analysis_server/test/analysis/notification_errors_test.dart
diff --git a/pkg/analysis_server/test/analysis/notification_errors_test.dart b/pkg/analysis_server/test/analysis/notification_errors_test.dart
index 02b05ec8b87c07870bc1a8f94102f5fb11741428..65bed47d2d2aa7e4eab94e7379f8265b722c49eb 100644
--- a/pkg/analysis_server/test/analysis/notification_errors_test.dart
+++ b/pkg/analysis_server/test/analysis/notification_errors_test.dart
@@ -10,15 +10,17 @@ import 'package:analysis_server/src/domain_analysis.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/services/lint.dart';
 import 'package:linter/src/linter.dart';
+import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
-import 'package:unittest/unittest.dart';
 
 import '../analysis_abstract.dart';
 import '../utils.dart';
 
 main() {
   initializeTestEnvironment();
-  defineReflectiveTests(NotificationErrorsTest);
+  defineReflectiveSuite(() {
+    defineReflectiveTests(NotificationErrorsTest);
+  });
 }
 
 @reflectiveTest
@@ -35,7 +37,9 @@ class NotificationErrorsTest extends AbstractAnalysisTest {
   @override
   void setUp() {
     super.setUp();
-    server.handlers = [new AnalysisDomainHandler(server),];
+    server.handlers = [
+      new AnalysisDomainHandler(server),
+    ];
   }
 
   test_importError() async {