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TST: added test for groupby when calling first, last, nth (GH29645) #43358

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Merged
merged 4 commits into from
Sep 6, 2021
Merged

TST: added test for groupby when calling first, last, nth (GH29645) #43358

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8379f11
TST: added test for groupby when calling first, last, nth (GH29645)
lorenzophys Sep 2, 2021
384d32f
TST: code review, explicit expected, parametrized over nans
lorenzophys Sep 2, 2021
a9646d8
TST: code review, check for value, use nulls_fixture
lorenzophys Sep 2, 2021
2636ad7
TST: code review, moved test to test_nth.py
lorenzophys Sep 3, 2021
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17 changes: 17 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 @@ -2419,3 +2419,20 @@ def test_rolling_wrong_param_min_period():
result_error_msg = r"__init__\(\) got an unexpected keyword argument 'min_period'"
with pytest.raises(TypeError, match=result_error_msg):
test_df.groupby("name")["val"].rolling(window=2, min_period=1).sum()


@pytest.mark.parametrize("method", ["first", "last", "nth"])
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@jreback jreback Sep 2, 2021

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can you move to test_nth.py

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@lorenzophys lorenzophys Sep 3, 2021

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Sure thing

def test_groupby_last_first_nth_with_none(method, nulls_fixture):
# GH29645
expected = Series(["y"])
data = Series(
[nulls_fixture, nulls_fixture, nulls_fixture, "y", nulls_fixture],
index=[0, 0, 0, 0, 0],
).groupby(level=0)

if method == "nth":
result = getattr(data, method)(3)
else:
result = getattr(data, method)()

tm.assert_series_equal(result, expected)