Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/analysis/navigation_collector_test.dart

Index: pkg/analysis_server/test/analysis/navigation_collector_test.dart
diff --git a/pkg/analysis_server/test/analysis/navigation_collector_test.dart b/pkg/analysis_server/test/analysis/navigation_collector_test.dart
index e0f118f2bc70650d444c90a8ac531af3582604cc..adc001559a1be81e25c4357a1a4791f640940ad9 100644
--- a/pkg/analysis_server/test/analysis/navigation_collector_test.dart
+++ b/pkg/analysis_server/test/analysis/navigation_collector_test.dart
@@ -6,14 +6,16 @@ library test.analysis.navigation_collector;
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/domains/analysis/navigation.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(NavigationCollectorImplTest);
+  defineReflectiveSuite(() {
+    defineReflectiveTests(NavigationCollectorImplTest);
+  });
 }
 
 @reflectiveTest