[test] fix tests for new tap version that was pulled

[jcrugzz]

Discovered this in the process of attempting to fix a "bug" in #137

[mantoni]

Thanks. It's slightly worrying that the stack disappears. Any idea why?

[jcrugzz]

@mantoni the stack didnt disappear, it just includes a longer stacktrace more thorough stacktrace. it didnt seem advantageous to test that particular string output as it causes false positive failures like i found here when a new version was installed. We dont need to be coupled that strictly to the string output, just acknowledge the passing or failing.

[mantoni]

Sorry for keeping this open for so long. I was still stuck with PhantomJS 1.9 and therefore the test cases didn't fail for me and I couldn't really verify this properly. Thanks for looking into it!