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TST: Add test to verify align behaviour on CategoricalIndex #34880

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Merged
merged 4 commits into from
Jul 6, 2020
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Merged

TST: Add test to verify align behaviour on CategoricalIndex #34880

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3637554
Add test to verify `align` behaviour on `CategoricalIndex`
MBrouns Jun 20, 2020
d9894ad
use different dataframes in testing index alignment to ensure there's…
MBrouns Jun 20, 2020
ef41dcd
move test to test_align.py
MBrouns Jun 20, 2020
7f4bf9f
parametrize categorical alignment test on ordered / non-ordered
MBrouns Jun 26, 2020
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33 changes: 33 additions & 0 deletions pandas/tests/frame/methods/test_align.py
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Original file line number Diff line number Diff line change
Expand Up @@ -129,6 +129,39 @@ def test_align_mixed_int(self, mixed_int_frame):
)
tm.assert_index_equal(bf.index, Index([]))

@pytest.mark.parametrize(
"l_ordered,r_ordered,expected",
[
[True, True, pd.CategoricalIndex],
[True, False, pd.Index],
[False, True, pd.Index],
[False, False, pd.CategoricalIndex],
],
)
def test_align_categorical(self, l_ordered, r_ordered, expected):
# GH-28397
df_1 = DataFrame(
{
"A": np.arange(6, dtype="int64"),
"B": Series(list("aabbca")).astype(
pd.CategoricalDtype(list("cab"), ordered=l_ordered)
),
}
).set_index("B")
df_2 = DataFrame(
{
"A": np.arange(5, dtype="int64"),
"B": Series(list("babca")).astype(
pd.CategoricalDtype(list("cab"), ordered=r_ordered)
),
}
).set_index("B")

aligned_1, aligned_2 = df_1.align(df_2)
assert isinstance(aligned_1.index, expected)
assert isinstance(aligned_2.index, expected)
tm.assert_index_equal(aligned_1.index, aligned_2.index)

def test_align_multiindex(self):
# GH#10665
# same test cases as test_align_multiindex in test_series.py
Expand Down