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TST: investigate and fix xfail_xp_backend with test class inheritance #452
Description
See #449 (comment) for the problem. It would be nice to get this fixed so that we can keep writing concise test classes when we need to xfail.
cc @cakedev0
Activity
Cyril-36 commentedon Oct 22, 2026
I would like to investigate this, starting with a regression test rather than assuming inheritance itself is the cause.
On current main (2aeb675), I ran a minimal parent/child test-class case using the existing library and xp fixtures: a class-level xfail_xp_backend(Backend.NUMPY) correctly applies to inherited plain and parametrized methods (3 parent cases passed, 3 child cases xfailed; pytest 9.1.1, Python 3.12). This does not reproduce the original Sparse/argpartition case, and I have not tested that backend yet.
Would a useful next step be to recreate the original TestArgpartition inheritance pattern with Sparse and check whether the explicit test-method wrappers are still necessary? If it is specific to an older pytest/backend combination, is there a version you would like covered?