anchor.diff:  	"GOOGLE_MASTER_BILLING_ACCOUNT",
   }
   
  +var mutex = &sync.Mutex{}
  +
   func init() {
   	configs = make(map[string]*Config)
   	sources = make(map[string]VcrSource)
  
positive.code: 		}
  		s := rand.NewSource(seed)
  		vcrSource := VcrSource{seed: seed, source: s}
  		sources[t.Name()] = vcrSource
  		return &vcrSource, nil
  	default:
  		log.Printf("[DEBUG] No valid environment var set for VCR_MODE, expected RECORDING or REPLAYING, skipping VCR. VCR_MODE: %s", mode)
  
negative.code: 		return false
  	})
  	config.client.Transport = rec
  	mutex.Lock()
  	configs[testName] = config
  	mutex.Unlock()
  	return config, nil
  }
  
  