public function testWarmUpCache()
 {
     $provider = $this->getProviderMock();
     $provider->expects($this->once())->method('warmUpCache');
     $default = $this->getProviderMock();
     $default->expects($this->once())->method('warmUpCache');
     $this->provider->addProvider($provider);
     $this->provider->setDefaultProvider($default);
     $this->provider->warmUpCache();
 }