TST: isspmatrix_csr is deprecated in scipy-dev
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Description
Example log: https://github.com/astropy/astropy/actions/runs/30549199357/job/90893342732 (ignore the `_unwrap` stuff being handled separately in https://github.com/astropy/astropy/pull/20132 )
Affects `nddata` tests.
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All sparse matrix classes (`*_matrix`) are being deprecated in favor of sparse arrays (`*_array`), which have a NumPy-compatible API, e.g. `*` is elementwise multiplication. See the `spmatrix` to `sparray` migration guide https://docs.scipy.org/doc/scipy/reference/sparse.migration_to_sparray.html
The `isspmatrix_csr` function will be removed no earlier than v2.2.
Contributor guide
Research direction
Start by searching the nddata tests for uses of isspmatrix_csr and read the affected test cases around those references. Update the tests to follow SciPy's sparse matrix-to-array migration guidance, then run the nddata test subset and confirm the deprecation warning is no longer triggered.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- testing
- Issue type
- Refactor
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Activity status
- Quiet
- Clarity
- Mostly clear
- Newbie friendliness
- 68/100