Fully mock up the context object to work with succeed and fail

[jonyo]

This would resolve #8

[Tim-B]

Hi jayno, thanks for the pull request!

It looks like the Travis tests are failing, but there's another issue someone reported which gives a similar message to what the Travis results say. Could you confirm that the tests pass on your machine?

[jonyo]

@Tim-B the tests fail on my box, even running develop. I think I know the problem, has to do with NPM global installation not being in the path even though it's installed globally. I've seen other packages that require parts of npm specify it in the package.json, will try that and see if tests pass (if so I'll do a separate PR for that).

[jonyo]

@Tim-B It did fix it for my local tests, see PR #13. If you are fine with that and merge it, I'll rebase my 2 PR's to make sure they pass with the fixed NPM dependency.

[Tim-B]

Thanks, I'll try and make time to work through your PRs this weekend.