[...]
> Disagreed. Unit tests should definitely protect against the introduction
> of bugs (willingly or not). And unpredictable behaviour is usually
> considered a bug.
>
> If you think the condition variable specification should be changed, you
> can always ask for approval on python-dev. But I don't even see the
> point: you are not demonstrating any *practical* advantage in doing so.

One can imagine, for example, that another implementation (or maybe
CPython in a later version) exposes native condition variables on
POSIX, instead of emulating them (e.g. what happended for TLS
implementation).
In that case, we could get spurious wakeups, and code not designed to
cope with them would break.