Kevinrob\GuzzleCache\CacheMiddleware::purgeReValidation PHP Method

    public function purgeReValidation()
    {
        \GuzzleHttp\Promise\inspect_all($this->waitingRevalidate);
    }

 public function testStaleWhileRevalidateHeader()
 {
     $this->client->get('http://test.com/stale-while-revalidate');
     sleep(2);
     $response = $this->client->get('http://test.com/stale-while-revalidate');
     $this->assertEquals(CacheMiddleware::HEADER_CACHE_STALE, $response->getHeaderLine(CacheMiddleware::HEADER_CACHE_INFO));
     // Do that at the end of the php script...
     $this->cache->purgeReValidation();
     $response = $this->client->get('http://test.com/stale-while-revalidate');
     $this->assertEquals(CacheMiddleware::HEADER_CACHE_HIT, $response->getHeaderLine(CacheMiddleware::HEADER_CACHE_INFO));
 }