Switch analysis_server to use 'package:test'.

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

Index: pkg/analysis_server/test/integration/analysis/highlights_test.dart
diff --git a/pkg/analysis_server/test/integration/analysis/highlights_test.dart b/pkg/analysis_server/test/integration/analysis/highlights_test.dart
index 7605ea37e3db41bea19e30b12472b91202e4a189..2b629eb2631435e634e1d6555655610c73d7a270 100644
--- a/pkg/analysis_server/test/integration/analysis/highlights_test.dart
+++ b/pkg/analysis_server/test/integration/analysis/highlights_test.dart
@@ -5,15 +5,17 @@
 library test.integration.analysis.highlights;
 
 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(AnalysisHighlightsTest);
+  defineReflectiveSuite(() {
+    defineReflectiveTests(AnalysisHighlightsTest);
+  });
 }
 
 @reflectiveTest
@@ -99,6 +101,7 @@ int topLevelVariable;
         expect(highlights[type], equals(expected.toSet()));
         highlights.remove(type);
       }
+
       check(HighlightRegionType.ANNOTATION, ['@override']);
       check(HighlightRegionType.BUILT_IN,
           ['as', 'get', 'import', 'set', 'static', 'typedef']);