Switch analysis_server to use 'package:test'.

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

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 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
 class Test extends AbstractAnalysisServerIntegrationTest {
   test_overrides() {
     String pathname = sourcePath('test.dart');
     String text = r'''
 abstract class Interface1 {
   method0();
   method1();
@@ skipping 40 matching lines @@
       int targetOffset = text.indexOf('Target');
       Override findOverride(String methodName) {
         int methodOffset = text.indexOf(methodName, targetOffset);
         for (Override override in overrides) {
           if (override.offset == methodOffset) {
             return override;
           }
         }
         return null;
       }
+
       void checkOverrides(String methodName, bool expectedOverridesBase,
           List<String> expectedOverridesInterfaces) {
         Override override = findOverride(methodName);
         if (!expectedOverridesBase && expectedOverridesInterfaces.isEmpty) {
           // This method overrides nothing, so it should not appear in the
           // overrides list.
           expect(override, isNull);
           return;
         } else {
           expect(override, isNotNull);
@@ skipping 15 matching lines @@
             String className = overriddenMember.className;
             bool wasAdded = actualOverridesInterfaces.add(className);
             expect(wasAdded, isTrue);
           }
           expect(actualOverridesInterfaces,
               equals(expectedOverridesInterfaces.toSet()));
         } else {
           expect(interfaceMembers, isNull);
         }
       }
+
       checkOverrides('method0', true, ['Interface1', 'Interface2']);
       checkOverrides('method1', false, ['Interface1', 'Interface2']);
       checkOverrides('method2', true, ['Interface1']);
       checkOverrides('method3', false, ['Interface1']);
       checkOverrides('method4', true, ['Interface2']);
       checkOverrides('method5', false, ['Interface2']);
       checkOverrides('method6', true, []);
       checkOverrides('method7', false, []);
     });
   }
 }