Mocha + Chai - no details on errors

I have a problem with mocha and chai. My tests doesn't show errors on failed tests (eg. expected 'a' to be 'b'). test log

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npm ERR! Test failed.  See above for more details.

I can't really extract some part of code - I think the problem doesn't directly lay in mocha or chai. My repo: github repository.

All you need to do is to clone repo, install dependencies and run mongodb. Feel free to create falsy test and see output.

Best Regards