node.js - How to run NodeJS unit tests with a different NODE_PATH -

the question

can run unit tests within node/gulp have different node_path has been inherited environment?

the issue

i have project being run within rhino based application, require loads scripts set of defined locations.

i want have unit tests components. in order run tests need able call scripts node environment. ends error similar this:

error: cannot find module 'lib/foo/foo.js' 

this because scripts contain require(foo/foo)... fine if node_path have contained lib. issue here want folder present unit tests, not other gulp tasks.

---

i guess issue facing test runners came across (e.g. karma) browser based. question might be: is there test runner runs pure nodejs tests?

well can along lines of

node_path=node_path:/path/to/lib npm test`. 

node_path environment variable. rely on value persists through login shell profile. can set/unset/change suits you.

to set environment variable duration of execution of 1 command...

variable=value command <args...> 

to set environment variable duration of shell session i.e. until exit/logout or reset shell...

export variable=value command <args...> 

to make persist through shell sessions, have add export varibale=value your

.bashrc or
.bash_profile or
/etc/profile or
file inside /etc/profile.d/

depending on preference , environment.

edit: have made unfair assumption using linux or mac. apologize if not case. windows, can like

%node_path%=%node_path%;\path\to\lib\ 

or something. can go system properties -> advanced settings -> environment variables , set/unset/change globally persistent environment variables there.

edit #2: refactored clarity.