assertLocalTaskAppears example

// Verify local tasks defined in the hook.     $this->drupalGet(Url::fromRoute('menu_test.tasks_default'));
    $this->assertLocalTasks([
      ['menu_test.tasks_default', []],
      ['menu_test.router_test1', ['bar' => 'unsafe']],
      ['menu_test.router_test1', ['bar' => '1']],
      ['menu_test.router_test2', ['bar' => '2']],
    ]);

    // Verify that script tags are escaped on output.     $title = Html::escape("Task 1 <script>alert('Welcome to the jungle!')</script>");
    $this->assertLocalTaskAppears($title);
    $title = Html::escape("<script>alert('Welcome to the derived jungle!')</script>");
    $this->assertLocalTaskAppears($title);

    // Verify that local tasks appear as defined in the router.     $this->drupalGet(Url::fromRoute('menu_test.local_task_test_tasks_view'));
    $this->assertLocalTasks([
      ['menu_test.local_task_test_tasks_view', []],
      ['menu_test.local_task_test_tasks_edit', []],
      ['menu_test.local_task_test_tasks_settings', []],
      ['menu_test.local_task_test_tasks_settings_dynamic', []],
    ]);