private function diff($expectedWarmers, $actualWarmers)
 {
     $result = array();
     foreach ($expectedWarmers as $key => $value) {
         if (!isset($actualWarmers[$key]) || !Util::recursiveSame($value, $actualWarmers[$key])) {
             $result[$key] = $value;
         }
     }
     return $result;
 }
 /**
  * @dataProvider recursiveSameTestCases
  */
 public function testRecursiveSame($same, $lhs, $rhs)
 {
     $this->assertEquals($same, Util::recursiveSame($lhs, $rhs));
 }