TST: Add regression test for infer_freq stateful behavior (#55794) #63224
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mroeschke
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Dec 1, 2025
| assert frequencies.infer_freq(times[:3]) == "D" | ||
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| # Call on full index (which has duplicates, so returns None) | ||
| frequencies.infer_freq(times) |
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| frequencies.infer_freq(times) | |
| assert frequencies.infer_freq(times) is None |
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doc/source/whatsnew/vX.X.X.rstfile if fixing a bug or adding a new feature.AGENTS.md.This PR adds a regression test for #55794.
The bug was that
infer_freqhad stateful behavior - calling it on a full index with duplicates would affect the result of subsequent calls on slices without duplicates. This has been fixed on main and this test ensures the fix is not regressed.