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TST: 2d index when constructing dataframe (#25416). #29083

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Oct 19, 2019
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TST: 2d index when constructing dataframe (#25416). #29083

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19 changes: 19 additions & 0 deletions pandas/tests/frame/test_constructors.py
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Original file line number Diff line number Diff line change
Expand Up @@ -424,6 +424,25 @@ def test_constructor_multi_index(self):
df = DataFrame(index=mi, columns=mi)
assert pd.isna(df).values.ravel().all()

def test_constructor_2d_index(self):
# GH 25416
# handling of 2d index in construction
df = pd.DataFrame([[1]], columns=[[1]], index=[1, 2])
expected = pd.DataFrame(
[1, 1],
index=pd.Int64Index([1, 2], dtype="int64"),
columns=pd.MultiIndex(levels=[[1]], codes=[[0]]),
)
tm.assert_frame_equal(df, expected)

df = pd.DataFrame([[1]], columns=[[1]], index=[[1, 2]])
expected = pd.DataFrame(
[1, 1],
index=pd.MultiIndex(levels=[[1, 2]], codes=[[0, 1]]),
columns=pd.MultiIndex(levels=[[1]], codes=[[0]]),
)
tm.assert_frame_equal(df, expected)

def test_constructor_error_msgs(self):
msg = "Empty data passed with indices specified."
# passing an empty array with columns specified.
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