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TST: ensuring bins in cut during tiling are predictably small #62868

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merged 2 commits into from
Oct 29, 2025
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TST: ensuring bins in cut during tiling are predictably small #62868

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TST: ensuring bins in cut during tiling are predictably small
Nikhil-Narayanan Oct 26, 2025
0599336
TST: parametrize single_bin_edge_adjustment re mroeschke's review
Nikhil-Narayanan Oct 29, 2025
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16 changes: 16 additions & 0 deletions pandas/tests/reshape/test_cut.py
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Original file line number Diff line number Diff line change
Expand Up @@ -410,6 +410,22 @@ def test_single_bin(data, length):
tm.assert_series_equal(result, expected)


@pytest.mark.parametrize(
"values,threshold",
[
([0.1, 0.1, 0.1], 0.001), # small positive values
([-0.1, -0.1, -0.1], 0.001), # negative values
([0.01, 0.01, 0.01], 0.0001), # very small values
],
)
def test_single_bin_edge_adjustment(values, threshold):
# gh-58517 - edge adjustment mutation when all values are same
result, bins = cut(values, 3, retbins=True)

bin_range = bins[-1] - bins[0]
assert bin_range < threshold


@pytest.mark.parametrize(
"array_1_writeable,array_2_writeable", [(True, True), (True, False), (False, False)]
)
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