BF(workaround): skip test_diff if hypothesis is not importable #675
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Apparently hypothesis is quite a tricky beast. It might either fail to install
on elderly systems from source tarball, or even if it is installable, apparently
might rely on some coverage API which is present only in more recent versions
and thus fail upon import.
All those are of relevance for older systems and only for testing.
I know that e.g. #661 would add tests in the
test_diff.py
which would not even need hypothesis, but I do not see easy way to make it work since hypothesis's given is used as a decorator.