constraints: fix allows
, allows_any
and allows_all
for generic constraints and increase test coverage
#732
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While reviewing #722, I noticed some bugs in the existing implementation of
allows
,allows_any
andallows_all
for generic constraints combined with a low test coverage.Further, I had some difficulties to tell what's the expected behavior of
allows
compared toallows_any
andallows_all
. When looking into version constraints for comparison, we can see thatallows
expects a version as argument whileallows_any
andallows_all
expect arbitrary version constraints. The equivalent of a version is a generic constraint with an==
operator (there is no explicit class as for version constraints). Therefore, I changedallows
to raise an error when passing another argument than a constraint with an==
operator to make the interface more clear.