setApcuPrefix example

        ],
      ],
    ]);

    $this->setSetting('class_loader_auto_detect', $value);
    $classloader = $this->prophesize(ClassLoader::class);

    // Assert that we call the setApcuPrefix on the classloader if     // class_loader_auto_detect is set to TRUE;     if ($value) {
      $classloader->setApcuPrefix(Argument::type('string'))->shouldBeCalled();
    }
    else {
      $classloader->setApcuPrefix(Argument::type('string'))->shouldNotBeCalled();
    }

    // Create a kernel suitable for testing.     $kernel = new DrupalKernel('test', $classloader->reveal(), FALSE, vfsStream::url('root'));
    $kernel->setSitePath(vfsStream::url('root/sites/default'));
    $kernel->boot();
  }

}

$this->bootstrapContainer = new $this->bootstrapContainerClass(Settings::get('bootstrap_container_definition', $this->defaultBootstrapContainerDefinition));

    // Initialize the container.     $this->initializeContainer();

    // Add the APCu prefix to use to cache found/not-found classes.     if (Settings::get('class_loader_auto_detect', TRUE) && method_exists($this->classLoader, 'setApcuPrefix')) {
      // Vary the APCu key by which modules are installed to allow       // class_exists() checks to determine functionality.       $id = 'class_loader:' . crc32(implode(':', array_keys($this->container->getParameter('container.modules'))));
      $prefix = Settings::getApcuPrefix($id, $this->root);
      $this->classLoader->setApcuPrefix($prefix);
    }

    $this->booted = TRUE;

    return $this;
  }

  /** * {@inheritdoc} */
  public function shutdown() {