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TST: add test case for sort_index on multiindexed Frame with sparse cols #36236

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Merged
merged 2 commits into from
Sep 12, 2020
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TST: add test case for sort_index on multiindexed Frame with sparse cols #36236

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TST: add test case for sort_index on multiindexed Frame with sparse c…
ylin00 Sep 9, 2020
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Merge branch 'master' into yl-pd-29735
ylin00 Sep 11, 2020
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15 changes: 15 additions & 0 deletions pandas/tests/frame/methods/test_sort_index.py
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Original file line number Diff line number Diff line change
Expand Up @@ -739,3 +739,18 @@ def test_changes_length_raises(self):
df = pd.DataFrame({"A": [1, 2, 3]})
with pytest.raises(ValueError, match="change the shape"):
df.sort_index(key=lambda x: x[:1])

def test_sort_index_multiindex_sparse_column(self):
# GH 29735, testing that sort_index on a multiindexed frame with sparse
# columns fills with 0.
expected = pd.DataFrame(
{
i: pd.array([0.0, 0.0, 0.0, 0.0], dtype=pd.SparseDtype("float64", 0.0))
for i in range(0, 4)
},
index=pd.MultiIndex.from_product([[1, 2], [1, 2]]),
)

result = expected.sort_index(level=0)

tm.assert_frame_equal(result, expected)