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TST: Test reindex w/ multiindex df (GH21247) #42528

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Jul 14, 2021
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TST: Test reindex w/ multiindex df (GH21247) #42528

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28 changes: 28 additions & 0 deletions pandas/tests/indexes/multi/test_reindex.py
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Original file line number Diff line number Diff line change
Expand Up @@ -133,3 +133,31 @@ def test_reindex_not_all_tuples():
tm.assert_index_equal(res, idx)
expected = np.array([0, 1, 2, -1], dtype=np.intp)
tm.assert_numpy_array_equal(indexer, expected)


def test_reindex_limit_arg_with_multiindex():
# GH21247

idx = MultiIndex.from_tuples([(3, "A"), (4, "A"), (4, "B")])

df = pd.Series([0.02, 0.01, 0.012], index=idx)

new_idx = MultiIndex.from_tuples(
[
(3, "A"),
(3, "B"),
(4, "A"),
(4, "B"),
(4, "C"),
(5, "B"),
(5, "C"),
(6, "B"),
(6, "C"),
]
)

with pytest.raises(
ValueError,
match="limit argument only valid if doing pad, backfill or nearest reindexing",
):
df.reindex(new_idx, fill_value=0, limit=1)