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TST: GH39443 - categorical datetime concat #41061

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arredond wants to merge 2 commits into from
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TST: GH39443 - categorical datetime concat #41061

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BUG: GH39443 - categorical datetime concat
arredond Apr 20, 2021
e7738f7
Merge branch 'master' of https://github.com/pandas-dev/pandas into ca…
arredond Jun 7, 2021
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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 @@ -202,3 +204,19 @@ def test_categorical_concat_gh7864(self):

dfa = df1.append(df2)
tm.assert_index_equal(df["grade"].cat.categories, dfa["grade"].cat.categories)

def test_categorical_datetime_concat(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)