This actually seems to be a problem with certain test fixtures in one of the dependencies: (github.com/ChimeraCoder/anaconda) .

The offending files are:

json/statuses/show.json?id=404409873170841600

json/statuses/show.json?id=738567564641599489

This occurs because Windows can't have question marks in the file names.

I would suggest creating a pull request, or an issue on that repo asking that those files be renamed and the test logic be modified to not require the files to have the question marks (a simple character replacement in the required tests should probably do the job).