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

pkg/analyzer_cli/test/strong_mode_test.dart

Index: pkg/analyzer_cli/test/strong_mode_test.dart
diff --git a/pkg/analyzer_cli/test/strong_mode_test.dart b/pkg/analyzer_cli/test/strong_mode_test.dart
index 15428ded7c0e4bbfab11f75d9ecab1aac62bab0c..763205a8ac25ce167e901f1dbc26fe24ea9779e1 100644
--- a/pkg/analyzer_cli/test/strong_mode_test.dart
+++ b/pkg/analyzer_cli/test/strong_mode_test.dart
@@ -2,14 +2,13 @@
 // 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.strong_mode;
 
 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 'driver_test.dart';
 import 'utils.dart';