How can I specify the PATH to PhantomJS using GRUNT and QUNIT?

Grunt uses PhantomJS to run headless QUnit tests in a very interesting way (correct me if I'm wrong please). Since I just started experimenting with those tools I don't fully understand it and don't know how to configure nor how to extend it.

I manage to get all working on my machine but I would like to not use the $PATH system variable. Instead, I would like to provide the path to PhantomJS's executable file via a setting which I could easily change and port to other environments.

How can I achieve this?

I suppose there are many ways and I think the Qunit Task from Grunt might have an easy answer. Ideally it would be just a matter of defining the path on the grun.js file, something like this:

qunit: {
      phantomjsPath: 'path/to/phantomjs',
      files: ['test/**/*.html']
    },

My environment is a MacOSX but I accept solutions for any kind of environments like Windows - my build server.

Thanks in advance.

UPDATE The version of Grunt I am using is v0.3.17. The next big version, v0.4.x, has many changes and some are not backwards compatible.

Solution

Well I think you finally migrated onto Grunt 0.4. And propably you got grunt-contrib-qunit plugin for running qunit tests under PhantomJS. Unfortunately you'll encountered the same issue - it's not possible to supply path to phantomjs executable. That's because grunt-contrib-qunit/grunt-contrib-phantomjs use phantomjs npm module which downloads PhantomJS on installation and hard-codes path to the executable in its js code. If you're experiencing such an issue then please check my blog post.