TST: add regression test for #26558#64623
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EthicalCha0s wants to merge 2 commits intopandas-dev:mainfrom
Open
TST: add regression test for #26558#64623EthicalCha0s wants to merge 2 commits intopandas-dev:mainfrom
EthicalCha0s wants to merge 2 commits intopandas-dev:mainfrom
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EthicalCha0s
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Summary
Adds a regression test for
DataFrame.add(fill_value=0)when the index is aMultiIndexcontaining a mix of string anddatetimelabels.References: #26558
Why
I couldn’t reproduce the incorrect result from GH#26558 on current
main, but I also couldn’t find a test covering this exact case. This adds coverage for the behavior so we don’t regress it later.Testing
pandas/tests/frame/test_arithmetic.py