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TST: Concatenating categorical datetime columns #53949

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Jun 30, 2023
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TST: Concatenating categorical datetime columns #53949

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18 changes: 18 additions & 0 deletions pandas/tests/reshape/concat/test_categorical.py
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Original file line number Diff line number Diff line change
@@ -1,3 +1,5 @@
from datetime import datetime

import numpy as np

from pandas.core.dtypes.dtypes import CategoricalDtype
Expand Down Expand Up @@ -166,6 +168,22 @@ def test_concat_categorical_tz(self):
)
tm.assert_series_equal(result, expected)

def test_concat_categorical_datetime(self):
# GH-39443
df1 = DataFrame(
{"x": Series(datetime(2021, 1, 1), index=[0], dtype="category")}
)
df2 = DataFrame(
{"x": Series(datetime(2021, 1, 2), index=[1], dtype="category")}
)

result = pd.concat([df1, df2])
expected = DataFrame(
{"x": Series([datetime(2021, 1, 1), datetime(2021, 1, 2)])}
)

tm.assert_equal(result, expected)

def test_concat_categorical_unchanged(self):
# GH-12007
# test fix for when concat on categorical and float
Expand Down