purgeReValidation() public method

Will be called at the end of the script.
public purgeReValidation ( )
 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));
 }
 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("Stale while revalidate", $response->getHeaderLine("X-Cache"));
     // Do that at the end of the php script...
     CacheMiddleware::purgeReValidation();
     $response = $this->client->get("http://test.com/stale-while-revalidate");
     $this->assertEquals("HIT", $response->getHeaderLine("X-Cache"));
 }