code: func (mgr *MockMSPManager) GetMSPs() (map[string]msp.MSP, error) {
  	if mgr.Err != nil && mgr.Err.Error() == "GetMSPs" {
  		return nil, mgr.Err
  	}
  
  	return mgr.MSPs, nil
  }
docs: // GetMSPs Provides a list of Membership Service providers