public function StorageTest::testCachedFormStorageValidation in Drupal 8

Same name and namespace in other branches

1. 9 core/modules/system/tests/src/Functional/Form/StorageTest.php \Drupal\Tests\system\Functional\Form\StorageTest::testCachedFormStorageValidation()
2. 10 core/modules/system/tests/src/Functional/Form/StorageTest.php \Drupal\Tests\system\Functional\Form\StorageTest::testCachedFormStorageValidation()

Tests updating cached form storage during form validation.

If form caching is enabled and a form stores data in the form storage, then the form storage also has to be updated in case of a validation error in the form. This test re-uses the existing form for multi-step tests, but triggers a special #element_validate handler to update the form storage during form validation, while another, required element in the form triggers a form validation error.

File

core/modules/system/tests/src/Functional/Form/StorageTest.php, line 118

Class

StorageTest

Tests a multistep form using form storage and makes sure validation and caching works right.

Namespace

Drupal\Tests\system\Functional\Form

Code

public function testCachedFormStorageValidation() {

  // Request the form with 'cache' query parameter to enable form caching.
  $this
    ->drupalGet('form_test/form-storage', [
    'query' => [
      'cache' => 1,
    ],
  ]);

  // Skip step 1 of the multi-step form, since the first step copies over
  // 'title' into form storage, but we want to verify that changes in the form
  // storage are updated in the cache during form validation.
  $edit = [
    'title' => 'foo',
  ];
  $this
    ->drupalPostForm(NULL, $edit, 'Continue submit');

  // In step 2, trigger a validation error for the required 'title' field, and
  // post the special 'change_title' value for the 'value' field, which
  // conditionally invokes the #element_validate handler to update the form
  // storage.
  $edit = [
    'title' => '',
    'value' => 'change_title',
  ];
  $this
    ->drupalPostForm(NULL, $edit, 'Save');

  // At this point, the form storage should contain updated values, but we do
  // not see them, because the form has not been rebuilt yet due to the
  // validation error. Post again and verify that the rebuilt form contains
  // the values of the updated form storage.
  $this
    ->drupalPostForm(NULL, [
    'title' => 'foo',
    'value' => 'bar',
  ], 'Save');
  $this
    ->assertSession()
    ->pageTextContains("The thing has been changed.", 'The altered form storage value was updated in cache and taken over.');
}