title: how to test the Navigation function in flutter unit Testing with mock for FluroRouter with AppRouter
body: <p>We are using FluroRouter with AppRouter its working fine in pages . but when we want to check this Navigation in unit testing we can't able to use FluroRoute with AppRouter. it always says router is not initialized. here are the code .</p>
  <pre><code>  redirectToTableNotFoundPage() {
      AppRouter.router.navigateTo(
          context!, CibusRouter.table_not_found_error_view,
          transition: TransitionType.inFromBottom);
    }
  </code></pre>
  <p>this is working fine in Pages .
  But in  Unit test</p>
  <pre><code> await redirectToTableNotFoundPage();
      verify( AppRouter.router.navigateTo(
              context!, CibusRouter.table_not_found_error_view,
              transition: TransitionType.inFromBottom));
  </code></pre>
  <p>then it shows router is not initialized . Please tell me how to initialize fluroRouter in Unit Testing</p>