function StorageTest::testImmutableForm

Tests form build ID regeneration when loading a cached immutable form.

File

core/modules/system/tests/src/Functional/Form/StorageTest.php, line 152

Class

StorageTest

Tests a multistep form using form storage.

Namespace

Code

public function testImmutableForm() : void {
  // Request the form with 'cache' query parameter to enable form caching.
  $this->drupalGet('form_test/form-storage', [
    'query' => [
      'cache' => 1,
      'immutable' => 1,
    ],
  ]);
  // Ensure the hidden 'form_build_id' field is unique.
  $this->assertSession()
    ->elementsCount('xpath', '//input[@name="form_build_id"]', 1);
  $buildId = $this->assertSession()
    ->hiddenFieldExists('form_build_id')
    ->getValue();
  // Trigger validation error by submitting an empty title.
  $edit = [
    'title' => '',
  ];
  $this->submitForm($edit, 'Continue submit');
  // Verify that the build-id did change.
  $this->assertSession()
    ->hiddenFieldValueNotEquals('form_build_id', $buildId);
  // Ensure the hidden 'form_build_id' field is unique.
  $this->assertSession()
    ->elementsCount('xpath', '//input[@name="form_build_id"]', 1);
  // Retrieve the new build-id.
  $buildId = (string) $this->assertSession()
    ->hiddenFieldExists('form_build_id')
    ->getValue();
  // Trigger validation error by again submitting an empty title.
  $edit = [
    'title' => '',
  ];
  $this->submitForm($edit, 'Continue submit');
  // Verify that the build-id does not change the second time.
  $this->assertSession()
    ->hiddenFieldValueEquals('form_build_id', $buildId);
}