assertFlagWidget example

        $entity->getEntityTypeId() => $id,
        'source' => 'en',
        'target' => 'it',
      ],
      [
        'language' => ConfigurableLanguage::load('it'),
        'absolute' => FALSE,
      ]
    );
    $this->drupalGet($add_translation_url);
    $this->assertFlagWidget();
    $edit = [
      'title[0][value]' => 'Test 1.2 IT',
      'moderation_state[0][state]' => 'published',
    ];
    $this->submitForm($edit, 'Save (this translation)');

    // Add a published French translation.     $add_translation_url = Url::fromRoute("entity.{$this->entityTypeId}.content_translation_add",
      [
        $entity->getEntityTypeId() => $id,
        'source' => 'en',