Switch analysis_server to use 'package:test'.

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

Index: pkg/analysis_server/test/services/correction/change_test.dart
diff --git a/pkg/analysis_server/test/services/correction/change_test.dart b/pkg/analysis_server/test/services/correction/change_test.dart
index 0cc92b4ab7e6d4971c7b8f330a4a0fd24c169787..24e87f49dde28183f26c2b1e67fe43af50f9801a 100644
--- a/pkg/analysis_server/test/services/correction/change_test.dart
+++ b/pkg/analysis_server/test/services/correction/change_test.dart
@@ -7,19 +7,21 @@ library test.services.correction.change;
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/protocol_server.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 '../../utils.dart';
 
 main() {
   initializeTestEnvironment();
-  defineReflectiveTests(ChangeTest);
-  defineReflectiveTests(EditTest);
-  defineReflectiveTests(FileEditTest);
-  defineReflectiveTests(LinkedEditGroupTest);
-  defineReflectiveTests(LinkedEditSuggestionTest);
-  defineReflectiveTests(PositionTest);
+  defineReflectiveSuite(() {
+    defineReflectiveTests(ChangeTest);
+    defineReflectiveTests(EditTest);
+    defineReflectiveTests(FileEditTest);
+    defineReflectiveTests(LinkedEditGroupTest);
+    defineReflectiveTests(LinkedEditSuggestionTest);
+    defineReflectiveTests(PositionTest);
+  });
 }
 
 @reflectiveTest