Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/integration/analysis/reanalyze_test.dart

Index: pkg/analysis_server/test/integration/analysis/reanalyze_test.dart
diff --git a/pkg/analysis_server/test/integration/analysis/reanalyze_test.dart b/pkg/analysis_server/test/integration/analysis/reanalyze_test.dart
index df1250b7c9ed879d5bdd875b36a2cd9a0d535042..b8037c124bd804498805bcdce67f2e5531f0f9e7 100644
--- a/pkg/analysis_server/test/integration/analysis/reanalyze_test.dart
+++ b/pkg/analysis_server/test/integration/analysis/reanalyze_test.dart
@@ -5,15 +5,17 @@
 library test.integration.analysis.reanalyze;
 
 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 '../integration_tests.dart';
 
 main() {
   initializeTestEnvironment();
-  defineReflectiveTests(Test);
+  defineReflectiveSuite(() {
+    defineReflectiveTests(Test);
+  });
 }
 
 @reflectiveTest