Switch 'analyzer' to 'package:test' and test_reflective_loader ^0.1.0.

pkg/analyzer/test/dart/element/element_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 analyzer.test.dart.element.element_test;
 
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/generated/testing/element_factory.dart';
+import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
-import 'package:unittest/unittest.dart';
 
 import '../../generated/test_support.dart';
 import '../../utils.dart';
 
 main() {
   initializeTestEnvironment();
-  defineReflectiveTests(ElementKindTest);
+  defineReflectiveSuite(() {
+    defineReflectiveTests(ElementKindTest);
+  });
 }
 
 @reflectiveTest
 class ElementKindTest extends EngineTestCase {
   void test_of_nonNull() {
     expect(ElementKind.of(ElementFactory.classElement2("A")),
         same(ElementKind.CLASS));
   }
 
   void test_of_null() {
     expect(ElementKind.of(null), same(ElementKind.ERROR));
   }
 }