code: public function setStoreId($testSessionId, $storeId)
      {
          $extendedState = $this->getExtendedState($testSessionId);
          $extendedState->setStoreId($storeId);
          $extendedState->save();
      }
docs: Sets the name of the client store used for the timer
  @param string $testSessionId
  @param string $storeId
  @throws \common_Exception