class MultiFormTest

class MultiFormTest extends WebDriverTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'node',
        'form_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->drupalCreateContentType([
            'type' => 'page',
            'name' => 'Page',
        ]);
        // Create a multi-valued field for 'page' nodes to use for Ajax testing.
        $field_name = 'field_ajax_test';
        FieldStorageConfig::create([
            'entity_type' => 'node',
            'field_name' => $field_name,
            'type' => 'text',
            'cardinality' => FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED,
        ])->save();
        FieldConfig::create([
            'field_name' => $field_name,
            'entity_type' => 'node',
            'bundle' => 'page',
        ])->save();
        \Drupal::service('entity_display.repository')->getFormDisplay('node', 'page', 'default')
            ->setComponent($field_name, [
            'type' => 'text_textfield',
        ])
            ->save();
        // Log in a user who can create 'page' nodes.
        $this->drupalLogin($this->drupalCreateUser([
            'create page content',
        ]));
    }
    
    /**
     * Tests that pages with the 'node_page_form' included twice work correctly.
     */
    public function testMultiForm() : void {
        // HTML IDs for elements within the field are potentially modified with
        // each Ajax submission, but these variables are stable and help target the
        // desired elements.
        $field_name = 'field_ajax_test';
        $form_xpath = '//form[starts-with(@id, "node-page-form")]';
        $field_xpath = '//div[contains(@class, "field--name-field-ajax-test")]';
        $button_name = $field_name . '_add_more';
        $button_xpath_suffix = '//input[@name="' . $button_name . '"]';
        $field_items_xpath_suffix = '//input[@type="text"]';
        // Ensure the initial page contains both node forms and the correct number
        // of field items and "add more" button for the multi-valued field within
        // each form.
        $this->drupalGet('form-test/two-instances-of-same-form');
        $session = $this->getSession();
        $page = $session->getPage();
        $fields = $page->findAll('xpath', $form_xpath . $field_xpath);
        $this->assertCount(2, $fields);
        foreach ($fields as $field) {
            $this->assertCount(1, $field->findAll('xpath', '.' . $field_items_xpath_suffix), 'Found the correct number of field items on the initial page.');
            $this->assertNotNull($field->find('xpath', '.' . $button_xpath_suffix), 'Found the "add more" button on the initial page.');
        }
        $this->assertSession()
            ->pageContainsNoDuplicateId();
        // Submit the "add more" button of each form twice. After each corresponding
        // page update, ensure the same as above.
        for ($i = 0; $i < 2; $i++) {
            $forms = $page->findAll('xpath', $form_xpath);
            foreach ($forms as $offset => $form) {
                $button = $form->findButton('Add another item');
                $this->assertNotNull($button, 'Add Another Item button exists');
                $button->press();
                // Wait for field to be added with ajax.
                $this->assertNotEmpty($page->waitFor(10, function () use ($form, $i) {
                    return $form->findField('field_ajax_test[' . ($i + 1) . '][value]');
                }));
                // After AJAX request and response verify the correct number of text
                // fields (including title), as well as the "Add another item" button.
                $this->assertCount($i + 3, $form->findAll('css', 'input[type="text"]'), 'Found the correct number of field items after an AJAX submission.');
                $this->assertNotEmpty($form->findButton('Add another item'), 'Found the "add more" button after an AJAX submission.');
                $this->assertSession()
                    ->pageContainsNoDuplicateId();
            }
        }
    }

}