EMFILE error on test

[nweldev]

The following error append randomly on npm test :

22 06 2016 08:48:39.809:ERROR [karma]: { [Error: EMFILE: too many open files, open 'C:\Documents and Settings\nmace\dev\architecture\sdn-angularjs-seed\app\libs\github\angular\[email protected]']
  errno: -4066,
  code: 'EMFILE',
  syscall: 'open',
  path: 'C:\\Documents and Settings\\nmace\\dev\\architecture\\sdn-angularjs-seed\\app\\libs\\github\\angular\\[email protected]' }
Error: EMFILE: too many open files, open 'C:\Documents and Settings\nmace\dev\architecture\sdn-angularjs-seed\app\libs\github\angular\[email protected]'
  at Error (native)

This error appear to be related to some issues on rolaveric/karma-systemjs, karma-runner/karma and isaacs/node-graceful-f.

See computmaxer/karma-jspm#97 for a similar case.