function PageCacheTest::testFormImmutability

Tests the setting of forms to be immutable.

File

core/modules/page_cache/tests/src/Functional/PageCacheTest.php, line 464

Class

PageCacheTest

Enables the page cache and tests it with various HTTP requests.

Namespace

Code

public function testFormImmutability() : void {
    // Install the module that provides the test form.
    $this->container
        ->get('module_installer')
        ->install([
        'page_cache_form_test',
    ]);
    // Uninstall the page_cache module to verify that form is immutable
    // regardless of the internal page cache module.
    $this->container
        ->get('module_installer')
        ->uninstall([
        'page_cache',
    ]);
    $this->drupalGet('page_cache_form_test_immutability');
    $this->assertSession()
        ->pageTextContains("Immutable: TRUE");
    // The immutable flag is set unconditionally by system_form_alter(), set
    // a flag to tell page_cache_form_test_module_implements_alter() to disable
    // that implementation.
    \Drupal::state()->set('page_cache_bypass_form_immutability', TRUE);
    \Drupal::moduleHandler()->resetImplementations();
    Cache::invalidateTags([
        'rendered',
    ]);
    $this->drupalGet('page_cache_form_test_immutability');
    $this->assertSession()
        ->pageTextContains("Immutable: FALSE");
}