Earlier quoted context omitted.
And here is where the decision was made to rename it: https://github.com/karma-runner/karma/issues/376
Wow. My humor is pretty crude but I'd never made the connection to testicles before. I'd just assumed it was a portmanteau of "test" and "spectacular" but I am British and the latter word still sees some usage ;-)
As an American it took... perhaps 5 minutes or so to scratch my head at the name :).