TST: Followup corrections to #28205 #28207
Merged
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PR summary
Make the changes suggested by @ianthomas23 in #28205, and also mark the ipython tests as using their backend. While the backend is already checked for availability at the top of the respective files, that only checks whether it can be imported, not whether it can be set as the Matplotlib backend. Adding the marker causes our pytest configuration to actually check and skip the test if unavailable (e.g., on Linux without
(WAYLAND_)DISPLAY
set fails to set an interactive backend).PR checklist