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TST: Add test to check category dtype remains unchanged after concat. #29352

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Merged
merged 4 commits into from
Nov 12, 2019
Merged

TST: Add test to check category dtype remains unchanged after concat. #29352

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14e5d67
TST: category dtype unchanged after concat.
Nov 2, 2019
e5845ae
TST: Test for fix of type issue in empty groupby from DataFrame with …
Nov 2, 2019
19e8ef4
Add test comment to re-trigger build.
Nov 3, 2019
27b7669
Dummy commit to force CI
jbrockmendel Nov 12, 2019
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16 changes: 16 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 @@ -2747,6 +2747,22 @@ def test_concat_categorical_tz():
tm.assert_series_equal(result, expected)


def test_concat_categorical_unchanged():
# GH-12007
# test fix for when concat on categorical and float
# coerces dtype categorical -> float
df = pd.DataFrame(pd.Series(["a", "b", "c"], dtype="category", name="A"))
ser = pd.Series([0, 1, 2], index=[0, 1, 3], name="B")
result = pd.concat([df, ser], axis=1)
expected = pd.DataFrame(
{
"A": pd.Series(["a", "b", "c", np.nan], dtype="category"),
"B": pd.Series([0, 1, np.nan, 2], dtype="float"),
}
)
tm.assert_equal(result, expected)


def test_concat_datetimeindex_freq():
# GH 3232
# Monotonic index result
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