function FormStoragePageCacheTest::getFormBuildId

Return the build id of the current form.

File

core/modules/system/tests/src/Functional/Form/FormStoragePageCacheTest.php, line 42

Class

FormStoragePageCacheTest

Tests form storage from cached pages.

Namespace

Code

protected function getFormBuildId() : string {
  // Ensure the hidden 'form_build_id' field is unique.
  $this->assertSession()
    ->elementsCount('xpath', '//input[@name="form_build_id"]', 1);
  $form_build_id_element = $this->assertSession()
    ->hiddenFieldExists('form_build_id');
  // Test that the autocomplete attribute is set to off to prevent Firefox and
  // similar browsers from retaining the form build ID on browser reload.
  // @todo Add actual testing that the form build ID is not retained once
  // Firefox is included in automated testing in
  // https://www.drupal.org/project/drupal/issues/3462680.
  $this->assertSame('off', $form_build_id_element->getAttribute('autocomplete'));
  return (string) $form_build_id_element->getAttribute('value');
}