Switch analysis_server to use 'package:test'.

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

Index: pkg/analysis_server/test/integration/analysis/overrides_test.dart
diff --git a/pkg/analysis_server/test/integration/analysis/overrides_test.dart b/pkg/analysis_server/test/integration/analysis/overrides_test.dart
index e7b77dca5a7cf7282d7675f83d2126e0a037c0e4..c08d044d8aba837b39e0b74c78439259f069592f 100644
--- a/pkg/analysis_server/test/integration/analysis/overrides_test.dart
+++ b/pkg/analysis_server/test/integration/analysis/overrides_test.dart
@@ -5,15 +5,17 @@
 library test.integration.analysis.overrides;
 
 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
@@ -74,6 +76,7 @@ class Target extends Base implements Interface1, Interface2 {
         }
         return null;
       }
+
       void checkOverrides(String methodName, bool expectedOverridesBase,
           List<String> expectedOverridesInterfaces) {
         Override override = findOverride(methodName);
@@ -109,6 +112,7 @@ class Target extends Base implements Interface1, Interface2 {
           expect(interfaceMembers, isNull);
         }
       }
+
       checkOverrides('method0', true, ['Interface1', 'Interface2']);
       checkOverrides('method1', false, ['Interface1', 'Interface2']);
       checkOverrides('method2', true, ['Interface1']);