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TST: Adding test to concat Sparse arrays #30645

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Jan 6, 2020
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TST: Adding test to concat Sparse arrays #30645

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11 changes: 11 additions & 0 deletions pandas/tests/reshape/test_concat.py
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,7 @@
read_csv,
)
import pandas._testing as tm
from pandas.core.arrays import SparseArray
from pandas.core.construction import create_series_with_explicit_dtype
from pandas.tests.extension.decimal import to_decimal

Expand Down Expand Up @@ -2739,3 +2740,13 @@ def test_concat_empty_df_object_dtype():
result = pd.concat([df_1, df_2], axis=0)
expected = df_1.astype(object)
tm.assert_frame_equal(result, expected)


def test_concat_sparse():
# GH 23557
a = pd.Series(SparseArray([0, 1, 2]))
expected = pd.DataFrame(data=[[0, 0], [1, 1], [2, 2]]).astype(
pd.SparseDtype(np.int64, 0)
)
result = pd.concat([a, a], axis=1)
tm.assert_frame_equal(result, expected)