Migrate `mockito` mocks to `typed_mock` (#24994).

pkg/analyzer_cli/test/super_mixin_test.dart

 // Copyright (c) 2015, 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.
 
-@TestOn("vm")
 library analyzer_cli.test.super_mixin;
 
 import 'dart:io';
 
 import 'package:analyzer_cli/src/driver.dart' show Driver, errorSink, outSink;
 import 'package:path/path.dart' as path;
-import 'package:test/test.dart';
+import 'package:unittest/unittest.dart';
 
 import 'utils.dart';
 
 /// End-to-end test for --supermixins.
 ///
 /// Most super mixin tests are in Analyzer, but this verifies the option is
 /// working and producing extra errors as expected.
 ///
 /// Generally we don't want a lot of cases here as it requires spinning up a
 /// full analysis context.
@@ skipping 35 matching lines @@
     test('produces no errors when option present', () async {
       var testPath = path.join(testDirectory, 'data/super_mixin_example.dart');
       new Driver().start(['--supermixin', testPath]);
 
       expect(exitCode, 0);
       var stdout = outSink.toString();
       expect(stdout, contains('No issues found'));
     });
   });
 }