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TST: add regression test for all-none-groupby #29067

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Oct 18, 2019
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TST: add regression test for all-none-groupby #29067

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10 changes: 10 additions & 0 deletions pandas/tests/groupby/test_groupby.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1944,3 +1944,13 @@ def test_shift_bfill_ffill_tz(tz_naive_fixture, op, expected):
result = getattr(grouped, op)()
expected = DataFrame(expected).assign(time=lambda x: x.time.dt.tz_localize(tz))
assert_frame_equal(result, expected)


def test_groupby_only_none_group():
# see GH21624
# this was crashing with "ValueError: Length of passed values is 1, index implies 0"
df = pd.DataFrame({"g": [None], "x": 1})
actual = df.groupby("g")["x"].transform("sum")
expected = pd.Series([np.nan], name="x")

assert_series_equal(actual, expected)