showHiddenFields example

/** * @covers ::media_form_filter_format_add_form_alter * @dataProvider providerTestValidations */
  public function testValidationWhenAdding($filter_html_status, $filter_align_status, $filter_caption_status, $filter_html_image_secure_status, $media_embed, $allowed_html, $expected_error_message) {
    $this->drupalGet('admin/config/content/formats/add');

    // Enable the `filter_html` and `media_embed` filters.     $page = $this->getSession()->getPage();
    $page->fillField('name', 'Another test format');
    $this->showHiddenFields();
    $page->findField('format')->setValue('another_media_embed_test');
    if ($filter_html_status) {
      $page->checkField('filters[filter_html][status]');
    }
    if ($filter_align_status) {
      $page->checkField('filters[filter_align][status]');
    }
    if ($filter_caption_status) {
      $page->checkField('filters[filter_caption][status]');
    }
    if ($filter_html_image_secure_status) {