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TST: add fillna test for filling with Categorical #62319

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TST: add fillna test for filling with Categorical #62319

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1e59742
add test for categorical series
thaiv28 Sep 10, 2025
7a4123e
Merge remote-tracking branch 'upstream/main' into test-fillna
thaiv28 Sep 11, 2025
3bc51e7
fix formatting
thaiv28 Sep 11, 2025
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add test for categorical series
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@thaiv28
thaiv28 committed Sep 10, 2025
commit 1e59742eb0b86aefc37a6d55cc03e16fc8cf771c
15 changes: 15 additions & 0 deletions pandas/tests/frame/methods/test_fillna.py
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Expand Up @@ -256,6 +256,21 @@ def test_fillna_categorical_nan(self):
idx = TimedeltaIndex(["1 days", "2 days", "1 days", NaT, NaT])
df = DataFrame({"a": Categorical(idx)})
tm.assert_frame_equal(df.fillna(value=NaT), df)

def test_fillna_with_categorical_series(self):
df = DataFrame({
'cats': Categorical(['A', 'B', 'C']),
'ints': [1.0, 2.0, np.nan]
})

filler = Series(Categorical([10.0, 20.0, 30.0]))
df.fillna({'ints': filler}, inplace=True)

expected = DataFrame({
'cats': Categorical(['A', 'B', 'C']),
'ints': [1.0, 2.0, 30.0]
})
tm.assert_frame_equal(df, expected)

def test_fillna_no_downcast(self, frame_or_series):
# GH#45603 preserve object dtype
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