function RegistryTest::testRaceCondition

Tests the behavior of the theme registry class.

File

core/tests/Drupal/KernelTests/Core/Theme/RegistryTest.php, line 32

Class

RegistryTest

Tests the behavior of the ThemeRegistry class.

Namespace

Code

public function testRaceCondition() : void {
  // The theme registry is not marked as persistable in case we don't have a
  // proper request.
  \Drupal::request()->setMethod('GET');
  $cid = 'test_theme_registry';
  // Directly instantiate the theme registry, this will cause a base cache
  // entry to be written in __construct().
  $cache = \Drupal::cache();
  $lock_backend = \Drupal::lock();
  $registry = new ThemeRegistry($cid, $cache, $lock_backend, [], $this->container
    ->get('module_handler')
    ->isLoaded());
  $this->assertNotEmpty(\Drupal::cache()->get($cid), 'Cache entry was created.');
  // Trigger a cache miss for an offset.
  $this->assertNotEmpty($registry->get('theme_test_template_test'), 'Offset was returned correctly from the theme registry.');
  // This will cause the ThemeRegistry class to write an updated version of
  // the cache entry when it is destroyed, usually at the end of the request.
  // Before that happens, manually delete the cache entry we created earlier
  // so that the new entry is written from scratch.
  \Drupal::cache()->delete($cid);
  // Destroy the class so that it triggers a cache write for the offset.
  $registry->destruct();
  $this->assertNotEmpty(\Drupal::cache()->get($cid), 'Cache entry was created.');
  // Create a new instance of the class. Confirm that both the offset
  // requested previously, and one that has not yet been requested are both
  // available.
  $registry = new ThemeRegistry($cid, $cache, $lock_backend, [], $this->container
    ->get('module_handler')
    ->isLoaded());
  $this->assertNotEmpty($registry->get('theme_test_template_test'), 'Offset was returned correctly from the theme registry');
  $this->assertNotEmpty($registry->get('theme_test_template_test_2'), 'Offset was returned correctly from the theme registry');
}