class ElementsLabelsTest

class ElementsLabelsTest extends BrowserTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'form_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Tests form elements.
     */
    public function testFormElements() : void {
        $this->testFormLabels();
        $this->testTitleEscaping();
        $this->testFormDescriptions();
        $this->testFormsInThemeLessEnvironments();
    }
    
    /**
     * Tests form element rendering.
     *
     * This method provides test coverage for:
     * - Form label rendering with different form elements.
     * - Rendering of the "Required" field marker.
     * - Prefix and suffix render element placement.
     * - Form element title attributes.
     */
    protected function testFormLabels() : void {
        $this->drupalGet('form_test/form-labels');
        // Check that the checkbox/radio processing is not interfering with
        // basic placement.
        $this->assertSession()
            ->elementExists('xpath', '//input[@id="edit-form-checkboxes-test-third-checkbox"]/following-sibling::label[@for="edit-form-checkboxes-test-third-checkbox" and @class="option"]');
        // Make sure the label is rendered for checkboxes.
        $this->assertSession()
            ->elementExists('xpath', '//input[@id="edit-form-checkboxes-test-0"]/following-sibling::label[@for="edit-form-checkboxes-test-0" and @class="option"]');
        $this->assertSession()
            ->elementExists('xpath', '//input[@id="edit-form-radios-test-second-radio"]/following-sibling::label[@for="edit-form-radios-test-second-radio" and @class="option"]');
        // Make sure the label is rendered for radios.
        $this->assertSession()
            ->elementExists('xpath', '//input[@id="edit-form-radios-test-0"]/following-sibling::label[@for="edit-form-radios-test-0" and @class="option"]');
        // Exercise various defaults for checkboxes and modifications to ensure
        // appropriate override and correct behavior.
        $this->assertSession()
            ->elementExists('xpath', '//input[@id="edit-form-checkbox-test"]/following-sibling::label[@for="edit-form-checkbox-test" and @class="option"]');
        // Exercise various defaults for textboxes and modifications to ensure
        // appropriate override and correct behavior.
        // Verify that label precedes textfield, with required marker inside label.
        $this->assertSession()
            ->elementExists('xpath', '//label[@for="edit-form-textfield-test-title-and-required" and @class="js-form-required form-required"]/following-sibling::input[@id="edit-form-textfield-test-title-and-required"]');
        // Verify that label tag with required marker precedes required textfield
        // with no title.
        $this->assertSession()
            ->elementExists('xpath', '//input[@id="edit-form-textfield-test-no-title-required"]/preceding-sibling::label[@for="edit-form-textfield-test-no-title-required" and @class="js-form-required form-required"]');
        // Verify that label preceding field and label class is visually-hidden.
        $this->assertSession()
            ->elementExists('xpath', '//input[@id="edit-form-textfield-test-title-invisible"]/preceding-sibling::label[@for="edit-form-textfield-test-title-invisible" and @class="visually-hidden"]');
        // Verify that no required marker on non-required field.
        $this->assertSession()
            ->elementNotExists('xpath', '//input[@id="edit-form-textfield-test-title"]/preceding-sibling::span[@class="js-form-required form-required"]');
        // Verify that label after field and label option class correct for text
        // field.
        $this->assertSession()
            ->elementExists('xpath', '//input[@id="edit-form-textfield-test-title-after"]/following-sibling::label[@for="edit-form-textfield-test-title-after" and @class="option"]');
        // Verify that no label tag exists when title set not to display.
        $this->assertSession()
            ->elementNotExists('xpath', '//label[@for="edit-form-textfield-test-title-no-show"]');
        // Verify that field class is form-no-label when there is no label.
        $this->assertSession()
            ->elementExists('xpath', '//div[contains(@class, "js-form-item-form-textfield-test-title-invisible") and contains(@class, "form-no-label")]');
        // Check #field_prefix and #field_suffix placement.
        $this->assertSession()
            ->elementExists('xpath', '//span[@class="field-prefix"]/following-sibling::div[@id="edit-form-radios-test"]');
        $this->assertSession()
            ->elementExists('xpath', '//span[@class="field-suffix"]/preceding-sibling::div[@id="edit-form-radios-test"]');
        // Check #prefix and #suffix placement. Both elements placed before the form
        // item.
        $this->assertSession()
            ->elementExists('xpath', '//div[@id="form-test-textfield-title-prefix"]/following-sibling::div[contains(@class, \'js-form-item-form-textfield-test-title\')]');
        $this->assertSession()
            ->elementExists('xpath', '//div[@id="form-test-textfield-title-suffix"]/preceding-sibling::div[contains(@class, \'js-form-item-form-textfield-test-title\')]');
        // Check title attribute for radios and checkboxes.
        $this->assertSession()
            ->elementAttributeContains('css', '#edit-form-checkboxes-title-attribute', 'title', 'Checkboxes test (Required)');
        $this->assertSession()
            ->elementAttributeContains('css', '#edit-form-radios-title-attribute', 'title', 'Radios test (Required)');
        // Check Title/Label not displayed when 'visually-hidden' attribute is set
        // in checkboxes.
        $this->assertSession()
            ->elementExists('xpath', '//fieldset[@id="edit-form-checkboxes-title-invisible--wrapper"]/legend/span[contains(@class, "visually-hidden")]');
        // Check Title/Label not displayed when 'visually-hidden' attribute is set
        // in radios.
        $this->assertSession()
            ->elementExists('xpath', '//fieldset[@id="edit-form-radios-title-invisible--wrapper"]/legend/span[contains(@class, "visually-hidden")]');
    }
    
    /**
     * Tests XSS-protection of element labels.
     */
    protected function testTitleEscaping() : void {
        $this->drupalGet('form_test/form-labels');
        foreach (FormTestLabelForm::$typesWithTitle as $type) {
            $this->assertSession()
                ->responseContains("{$type} alert('XSS') is XSS filtered!");
            $this->assertSession()
                ->responseNotContains("{$type} <script>alert('XSS')</script> is XSS filtered!");
        }
    }
    
    /**
     * Tests different display options for form element descriptions.
     */
    protected function testFormDescriptions() : void {
        $this->drupalGet('form_test/form-descriptions');
        // Check #description placement with #description_display='after'.
        $field_id = 'edit-form-textfield-test-description-after';
        $description_id = $field_id . '--description';
        // Verify the #description element is placed after the form item.
        $this->assertSession()
            ->elementExists('xpath', '//input[@id="' . $field_id . '" and @aria-describedby="' . $description_id . '"]/following-sibling::div[@id="' . $description_id . '"]');
        // Check #description placement with #description_display='before'.
        $field_id = 'edit-form-textfield-test-description-before';
        $description_id = $field_id . '--description';
        // Verify the #description element is placed before the form item.
        $this->assertSession()
            ->elementExists('xpath', '//input[@id="' . $field_id . '" and @aria-describedby="' . $description_id . '"]/preceding-sibling::div[@id="' . $description_id . '"]');
        // Check if the class is 'visually-hidden' on the form element description
        // for the option with #description_display='invisible' and also check that
        // the description is placed after the form element.
        $field_id = 'edit-form-textfield-test-description-invisible';
        $description_id = $field_id . '--description';
        // Verify that the #description element is visually-hidden.
        $this->assertSession()
            ->elementExists('xpath', '//input[@id="' . $field_id . '" and @aria-describedby="' . $description_id . '"]/following-sibling::div[contains(@class, "visually-hidden")]');
    }
    
    /**
     * Tests forms in theme-less environments.
     */
    protected function testFormsInThemeLessEnvironments() : void {
        $form = $this->getFormWithLimitedProperties();
        $render_service = $this->container
            ->get('renderer');
        // This should not throw any notices.
        $render_service->renderInIsolation($form);
    }
    
    /**
     * Return a form with element with not all properties defined.
     */
    protected function getFormWithLimitedProperties() {
        $form = [];
        $form['fieldset'] = [
            '#type' => 'fieldset',
            '#title' => 'Fieldset',
        ];
        return $form;
    }

}