class DynamicFormSectionsTest

class DynamicFormSectionsTest extends WebDriverTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'classy';
    
    /**
     * {@inheritdoc}
     */
    public 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', 'div.details-wrapper *'));
        // Cycle through the other dropdown values.
        $question_styles = [
            'Multiple Choice',
            'True/False',
            'Fill-in-the-blanks',
        ];
        // Check expectations against the details wrapper.
        $question_type_dropdown = $page->findField('question_type_select');
        foreach ($question_styles as $question_style) {
            $question_type_dropdown->setValue($question_style);
            $assert->assertWaitOnAjaxRequest();
            $this->assertNotEmpty($page->findAll('css', 'div.details-wrapper *'));
        }
        // Prompt to choose question should remove the question.
        $question_type_dropdown->setValue('Choose question style');
        $assert->assertWaitOnAjaxRequest();
        $this->assertEmpty($page->findAll('css', 'div.details-wrapper *'));
        // Submit the correct answers.
        foreach ($question_styles as $question_style) {
            $this->drupalGet($dropdown_url);
            $question_type_dropdown->setValue($question_style);
            $assert->assertWaitOnAjaxRequest();
            $this->drupalPostForm(NULL, [
                'question' => 'George Washington',
            ], 'Submit your answer');
            $assert->pageTextContains('You got the right answer: George Washington');
        }
    }

}