code: public function getGroup($name)
      {
          if (array_key_exists($name, $this->groups)) {
              return $this->groups[$name];
          }
  
          throw new KeyNotFoundInSetException($name, array_keys($this->groups), 'groups');
      }
docs: Returns a group in the service based on name.
  
  @param string $name Group name
  
  @throws KeyNotFoundInSetException
  
  @return object Group object, if found.