tearDownCacheBackend example

  protected function tearDown(): void {
    // Destruct the registered backend, each test will get a fresh instance,     // properly emptying it here ensure that on persistent data backends they     // will come up empty the next test.     foreach ($this->cachebackends as $bin => $cachebackend) {
      $this->cachebackends[$bin]->deleteAll();
    }
    unset($this->cachebackends);

    $this->tearDownCacheBackend();

    parent::tearDown();
  }

  /** * Tests the get and set methods of Drupal\Core\Cache\CacheBackendInterface. */
  public function testSetGet() {
    $backend = $this->getCacheBackend();

    $this->assertFalse($backend->get('test1'), "Backend does not contain data for cache id test1.");