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');
}