8000 TST: Groupby/transform with grouped NaN (#9941) by mroeschke · Pull Request #14907 · pandas-dev/pandas · GitHub
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TST: Groupby/transform with grouped NaN (#9941) #14907

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Dec 18, 2016
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TST: Groupby/transform with grouped NaN (#9941) #14907

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TST: Groupby/transform with grouped NaN (#9941)
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@mroeschke
mroeschke committed Dec 18, 2016
commit 30c1c70d5e1e266db7e8a125c1ac4d3cd89d6da8
9 changes: 9 additions & 0 deletions pandas/tests/groupby/test_groupby.py
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Expand Up @@ -1374,6 +1374,15 @@ def test_groupby_transform_with_int(self):
expected = DataFrame(dict(B=1, C=[2, 3, 4, 10, 5, -1]))
assert_frame_equal(result, expected)

def test_groupby_transform_with_nan_group(self):
# GH 9941
df = pd.DataFrame({'a': range(10),
'b': [1, 1, 2, 3, np.nan, 4, 4, 5, 5, 5]})
result = df.groupby(df.b)['a'].transform(max)
expected = pd.Series([1., 1., 2., 3., np.nan, 6., 6., 9., 9., 9.],
name='a')
assert_series_equal(result, expected)

def test_indices_concatenation_order(self):

# GH 2808
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0