class RebuildTest

class RebuildTest extends WebDriverTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'node',
        'form_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * A user for testing.
     *
     * @var \Drupal\user\UserInterface
     */
    protected $webUser;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->drupalCreateContentType([
            'type' => 'page',
            'name' => 'Basic page',
        ]);
        $this->webUser = $this->drupalCreateUser([
            'access content',
        ]);
        $this->drupalLogin($this->webUser);
    }
    
    /**
     * Tests that a form's action is retained after an Ajax submission.
     *
     * The 'action' attribute of a form should not change after an Ajax submission
     * followed by a non-Ajax submission, which triggers a validation error.
     */
    public function testPreserveFormActionAfterAJAX() : void {
        $page = $this->getSession()
            ->getPage();
        // Create a multi-valued field for 'page' nodes to use for Ajax testing.
        $field_name = 'field_ajax_test';
        FieldStorageConfig::create([
            'field_name' => $field_name,
            'entity_type' => 'node',
            'type' => 'text',
            'cardinality' => FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED,
        ])->save();
        FieldConfig::create([
            'field_name' => $field_name,
            'entity_type' => 'node',
            'bundle' => 'page',
        ])->save();
        // Also create a file field to test server side validation error.
        $field_file_name = 'field_file_test';
        FieldStorageConfig::create([
            'field_name' => $field_file_name,
            'entity_type' => 'node',
            'type' => 'file',
            'cardinality' => 1,
        ])->save();
        FieldConfig::create([
            'field_name' => $field_file_name,
            'entity_type' => 'node',
            'bundle' => 'page',
            'label' => 'Test file',
            'required' => TRUE,
        ])->save();
        \Drupal::service('entity_display.repository')->getFormDisplay('node', 'page', 'default')
            ->setComponent($field_name, [
            'type' => 'text_textfield',
        ])
            ->setComponent($field_file_name, [
            'type' => 'file_generic',
        ])
            ->save();
        // Log in a user who can create 'page' nodes.
        $this->webUser = $this->drupalCreateUser([
            'create page content',
        ]);
        $this->drupalLogin($this->webUser);
        // Get the form for adding a 'page' node. Submit an "add another item" Ajax
        // submission and verify it worked by ensuring the updated page has two text
        // field items in the field for which we just added an item.
        $this->drupalGet('node/add/page');
        $page->find('css', '[value="Add another item"]')
            ->click();
        $this->assertSession()
            ->assertWaitOnAjaxRequest();
        $this->assertSession()
            ->elementsCount('xpath', '//div[contains(@class, "field--name-field-ajax-test")]//input[@type="text"]', 2);
        // Submit the form with the non-Ajax "Save" button, leaving the file field
        // blank to trigger a validation error, and ensure that a validation error
        // occurred, because this test is for testing what happens when a form is
        // re-rendered without being re-built, which is what happens when there's
        // a server side validation error.
        $edit = [
            'title[0][value]' => $this->randomString(),
        ];
        $this->submitForm($edit, 'Save');
        $this->assertSession()
            ->pageTextContains('Test file field is required.');
        // Ensure that the form contains two items in the multi-valued field, so we
        // know we're testing a form that was correctly retrieved from cache.
        $this->assertSession()
            ->elementsCount('xpath', '//form[contains(@id, "node-page-form")]//div[contains(@class, "js-form-item-field-ajax-test")]//input[@type="text"]', 2);
        // Ensure that the form's action is correct.
        $forms = $this->xpath('//form[contains(@class, "node-page-form")]');
        $this->assertCount(1, $forms);
        // Strip query params off the action before asserting.
        $url = parse_url($forms[0]->getAttribute('action'))['path'];
        $this->assertEquals(Url::fromRoute('node.add', [
            'node_type' => 'page',
        ])->toString(), $url);
    }

}