Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/services/dependencies/test_all.dart

Index: pkg/analysis_server/test/services/dependencies/test_all.dart
diff --git a/pkg/analysis_server/test/services/dependencies/test_all.dart b/pkg/analysis_server/test/services/dependencies/test_all.dart
index b26ac82b58cc01ce96362020a19dde0ad419a33c..6b3420fae5e85552738eaf9f44c6efb894fe3526 100644
--- a/pkg/analysis_server/test/services/dependencies/test_all.dart
+++ b/pkg/analysis_server/test/services/dependencies/test_all.dart
@@ -4,7 +4,7 @@
 
 library test.services.dependencies;
 
-import 'package:unittest/unittest.dart';
+import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../../utils.dart';
 import 'library_dependencies_test.dart' as library_dependencies;
@@ -13,8 +13,8 @@ import 'reachable_source_collector_test.dart' as reachable_source_collector;
 /// Utility for manually running all tests.
 main() {
   initializeTestEnvironment();
-  group('dependencies', () {
+  defineReflectiveSuite(() {
     library_dependencies.main();
     reachable_source_collector.main();
-  });
+  }, name: 'dependencies');
 }