Advanced file structure for testing

In the video Guil talks about the "test" folder, I've set it up and it all works great. But it seems that ALL your test files need to go in that one folder i.e: You can't have any sub-directories otherwise when you run mocha or npm test, it doesn't seem to work properly.

I've tried running things like mocha ./test/* but with varying results.

This wouldn't bother me so much except in a larger project, I want to build a testing file structure that mimics my application logic file structure. For example, if I have a folder called "app" that contains a sub-directory called "controllers" with a file called "someCtrl.js", but there is another sub-directory called "directives" with a file called "someDirective.js"

app > controllers > someCtrl.js

and

app > directives > someDirective.js

I would then want to create the same file structure so that my test files are in the same format e.g:

test > app > controllers > someCtrl_test.js

and

test > app > directives > someDirective_test.js

Is there a standardised way of creating a more in depth file structure for testing purposes? Or is this bad practise?

Thanks in advance