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TST: Add test for category equalness on applies (#21239) #35125

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Merged
merged 1 commit into from
Jul 6, 2020
Merged

TST: Add test for category equalness on applies (#21239) #35125

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12 changes: 12 additions & 0 deletions pandas/tests/frame/test_apply.py
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Original file line number Diff line number Diff line change
Expand Up @@ -793,6 +793,18 @@ def test_apply_with_byte_string(self):
result = df.apply(lambda x: x.astype("object"))
tm.assert_frame_equal(result, expected)

@pytest.mark.parametrize("val", ["asd", 12, None, np.NaN])
def test_apply_category_equalness(self, val):
# Check if categorical comparisons on apply, GH 21239
df_values = ["asd", None, 12, "asd", "cde", np.NaN]
df = pd.DataFrame({"a": df_values}, dtype="category")

result = df.a.apply(lambda x: x == val)
expected = pd.Series(
[np.NaN if pd.isnull(x) else x == val for x in df_values], name="a"
)
tm.assert_series_equal(result, expected)


class TestInferOutputShape:
# the user has supplied an opaque UDF where
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