Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/services/correction/util_test.dart

Index: pkg/analysis_server/test/services/correction/util_test.dart
diff --git a/pkg/analysis_server/test/services/correction/util_test.dart b/pkg/analysis_server/test/services/correction/util_test.dart
index a435b1cc225958972cd6ad4e3439f3fc49a0d9f3..173fd0621cd2c764cc6f573ae315c5c287af9a93 100644
--- a/pkg/analysis_server/test/services/correction/util_test.dart
+++ b/pkg/analysis_server/test/services/correction/util_test.dart
@@ -9,15 +9,17 @@ import 'package:analysis_server/src/services/correction/strings.dart';
 import 'package:analysis_server/src/services/correction/util.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/generated/source.dart';
+import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
-import 'package:unittest/unittest.dart';
 
 import '../../abstract_single_unit.dart';
 import '../../utils.dart';
 
 main() {
   initializeTestEnvironment();
-  defineReflectiveTests(UtilTest);
+  defineReflectiveSuite(() {
+    defineReflectiveTests(UtilTest);
+  });
 }
 
 @reflectiveTest