class DynamicFormSectionsTest

class DynamicFormSectionsTest extends WebDriverTestBase {
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  
  /**
   * {@inheritdoc}
   */
  protected static $modules = [
    'ajax_example',
  ];
  
  /**
   * Test the dependent dropdown form with AJAX.
   */
  public function testDynamicFormSections() {
    // Get the Mink stuff.
    $assert = $this->assertSession();
    $page = $this->getSession()
      ->getPage();
    // Get a URL object for the form, specifying no JS.
    $dropdown_url = Url::fromRoute('ajax_example.dynamic_form_sections', [
      'nojs' => 'ajax',
    ]);
    // Get the form.
    $this->drupalGet($dropdown_url);
    // Check for the initial state.
    $this->assertEmpty($page->findAll('css', 'questions-wrapper *'));
    // Cycle through the other dropdown values.
    $question_styles = [
      'Multiple Choice',
      'True/False',
      'Fill-in-the-blanks',
    ];
    // Check expectations against the details wrapper.
    foreach ($question_styles as $question_style) {
      $assert->selectExists('question_type_select')
        ->selectOption($question_style);
      $assert->assertWaitOnAjaxRequest();
      $this->assertNotEmpty($page->findAll('css', '.questions-wrapper *'));
    }
    // Prompt to choose question should remove the question.
    $assert->selectExists('question_type_select')
      ->selectOption('Choose question style');
    $assert->assertWaitOnAjaxRequest();
    $this->assertEmpty($page->findAll('css', 'questions-wrapper *'));
    // Submit the correct answers.
    foreach ($question_styles as $question_style) {
      $this->drupalGet($dropdown_url);
      $assert->selectExists('question_type_select')
        ->selectOption($question_style);
      $assert->assertWaitOnAjaxRequest();
      $this->submitForm([
        'question' => 'George Washington',
      ], 'Submit your answer');
      $assert->pageTextContains('You got the right answer: George Washington');
    }
  }

}