Elastica\Connection\Strategy\CallbackStrategy::getConnection PHP Метод

    public function getConnection($connections)
    {
        return call_user_func_array($this->_callback, [$connections]);
    }

 /**
  * @group unit
  */
 public function testInvoke()
 {
     $count = 0;
     $callback = function ($connections) use(&$count) {
         ++$count;
     };
     $strategy = new CallbackStrategy($callback);
     $strategy->getConnection(array());
     $this->assertEquals(1, $count);
 }