Error with gulp serve:test when modify test code

[zhenkyle]

I have a new project generated in /home/zhenkyle/code, and running gulp serve:test. when I modify /home/zhenkyle/code/test/spec/test.js, errors shows on my console:

[04:47:02]Error: EPROTO: protocol error, mkdir '/home/zhenkyle/code/test/spec/**'

After some debug with comment & uncomment in gulpfile.js, I found the error comes from gulp.task('lint:test').