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TST: regression test for GH#56853 (insert/delete with MultiIndex datetime) #62238

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TST: regression test for GH#56853 (insert/delete with MultiIndex datetime) #62238

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23 changes: 23 additions & 0 deletions pandas/tests/frame/indexing/test_insert.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,9 @@
from pandas import (
DataFrame,
Index,
MultiIndex,
NaT,
Timestamp,
)
import pandas._testing as tm

Expand Down Expand Up @@ -94,3 +97,23 @@ def test_insert_int64_loc(self):
df = DataFrame({"a": [1, 2]})
df.insert(np.int64(0), "b", 0)
tm.assert_frame_equal(df, DataFrame({"b": [0, 0], "a": [1, 2]}))

def test_insert_delete_mixed_multiindex_columns(self):
# GH#56853

df = DataFrame({("A", Timestamp("2024-01-01")): [0]})
df.insert(1, "B", [1])

expected = DataFrame(
[[0, 1]],
columns=MultiIndex.from_tuples(
[("A", Timestamp("2024-01-01")), ("B", NaT)]
),
)
tm.assert_frame_equal(df, expected)

# Should not raise RecursionError (this was the original bug)
del df["B"]

expected = DataFrame({("A", Timestamp("2024-01-01")): [0]})
tm.assert_frame_equal(df, expected)
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