Cache\Prefixed\PrefixedCachePool::saveDeferred PHP Метод

    public function saveDeferred(CacheItemInterface $item)
    {
        return $this->cachePool->saveDeferred($item);
    }

 public function testSaveDeffered()
 {
     $item = $this->getMockBuilder(CacheItemInterface::class)->getMock();
     $prefix = 'ns';
     $returnValue = true;
     $stub = $this->getHierarchyCacheStub();
     $stub->expects($this->once())->method('saveDeferred')->with($item)->willReturn($returnValue);
     $pool = new PrefixedCachePool($stub, $prefix);
     $this->assertEquals($returnValue, $pool->saveDeferred($item));
 }