Error in unit test
I follow this tutorial : https://github.com/duniter/duniter/blob/master/doc/contribute-french.md#lancer-les-tests
I get an error when I call npm test
634 passing (2m) 1 failing
- HTTP API "before all" hook: Uncaught Error: listen EADDRINUSE 127.0.0.1:7778 at Object._errnoException (util.js:1024:11) at _exceptionWithHostPort (util.js:1046:20) at Server.setupListenHandle [as _listen2] (net.js:1351:14) at listenInCluster (net.js:1392:12) at doListen (net.js:1501:7) at _combinedTickCallback (internal/process/next_tick.js:141:11) at process._tickCallback (internal/process/next_tick.js:180:9)