Please note that this is intended to be a simple POC and uses vanilla versions of the corresponding test libraries. Tntent was to see what is possible on the lightning platform without any customization to the libraries.
Mocha/Jasmine are not LockerService compliant out of the box, so the POC only works with LockerService disabled. Lightning Test Service MVP should support/run with LockerService.
Mocha Tests https://github.com/esalman-sfdc/lighning-test-service-poc/blob/master/staticresources/mochatest.resource
Jasmine Tests https://github.com/esalman-sfdc/lighning-test-service-poc/blob/master/staticresources/jasmineTest.resource