MemoryCounterBackend example

  protected $bins = [];

  /** * {@inheritdoc} */
  public function get($bin) {
    if (!isset($this->bins[$bin])) {
      $this->bins[$bin] = new MemoryCounterBackend();
    }
    return $this->bins[$bin];
  }

}

// Test the situation where the alias and language are the same, but     // the source differs. The newer alias record should be returned.     $this->createPathAlias('/user/2', '/bar');
    $aliasManager->cacheClear();
    $this->assertEquals('/user/2', $aliasManager->getPathByAlias('/bar'), 'Newer alias record is returned when comparing two LanguageInterface::LANGCODE_NOT_SPECIFIED paths with the same alias.');
  }

  /** * Tests the alias whitelist. */
  public function testWhitelist() {
    $memoryCounterBackend = new MemoryCounterBackend();

    // Create AliasManager and Path object.     $whitelist = new AliasWhitelist('path_alias_whitelist', $memoryCounterBackend, $this->container->get('lock'), $this->container->get('state'), $this->container->get('path_alias.repository'));
    $aliasManager = new AliasManager($this->container->get('path_alias.repository'), $whitelist, $this->container->get('language_manager'), $memoryCounterBackend);

    // No alias for user and admin yet, so should be NULL.     $this->assertNull($whitelist->get('user'));
    $this->assertNull($whitelist->get('admin'));

    // Non-existing path roots should be NULL too. Use a length of 7 to avoid     // possible conflict with random aliases below.