Taskwarrior

All unit tests generate their own data immediately prior to running the test, then clean up after. Therefore I don't think this is important.

I was referring not so much to your battery of software tests, as I was to a sample.data file that was packed with imaginary examples of tasks, using every feature, for a whole imaginary family; something for new users and experimenters to play with.

Ah, I see. That makes a lot of sense. A sandbox.