* Update navigator.dart

* Update navigator.dart

* Add test

* Update navigator.dart

* lint

* Update packages/flutter/test/widgets/navigator_test.dart
Co-authored-by: chunhtai <47866232+chunhtai@users.noreply.github.com>

* Update packages/flutter/test/widgets/navigator_test.dart
Co-authored-by: chunhtai <47866232+chunhtai@users.noreply.github.com>
Co-authored-by: chunhtai <47866232+chunhtai@users.noreply.github.com>