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TST: IntegerNA Support for DataFrame.diff() #34889

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Merged
merged 3 commits into from
Jun 20, 2020
Merged

TST: IntegerNA Support for DataFrame.diff() #34889

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7682f8a
TST: IntegerNA Support for DataFrame.diff() (#24171)
Marvzinc Jun 20, 2020
ea8bc17
TST: IntegerNA Support for DataFrame.diff(axis=1) (#24171)
Marvzinc Jun 20, 2020
d5dca95
TST: IntegerNA Support for DataFrame.diff(axis=1) (#24171)
Marvzinc Jun 20, 2020
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45 changes: 45 additions & 0 deletions pandas/tests/frame/methods/test_diff.py
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Original file line number Diff line number Diff line change
Expand Up @@ -169,3 +169,48 @@ def test_diff_sparse(self):
)

tm.assert_frame_equal(result, expected)

@pytest.mark.parametrize(
"axis,expected",
[
(
0,
pd.DataFrame(
{
"a": [np.nan, 0, 1, 0, np.nan, np.nan, np.nan, 0],
"b": [np.nan, 1, np.nan, np.nan, -2, 1, np.nan, np.nan],
"c": np.repeat(np.nan, 8),
"d": [np.nan, 3, 5, 7, 9, 11, 13, 15],
},
dtype="Int64",
),
),
(
1,
pd.DataFrame(
{
"a": np.repeat(np.nan, 8),
"b": [0, 1, np.nan, 1, np.nan, np.nan, np.nan, 0],
"c": np.repeat(np.nan, 8),
"d": np.repeat(np.nan, 8),
},
dtype="Int64",
),
),
],
)
def test_diff_integer_na(self, axis, expected):
# GH#24171 IntegerNA Support for DataFrame.diff()
df = pd.DataFrame(
{
"a": np.repeat([0, 1, np.nan, 2], 2),
"b": np.tile([0, 1, np.nan, 2], 2),
"c": np.repeat(np.nan, 8),
"d": np.arange(1, 9) ** 2,
},
dtype="Int64",
)

# Test case for default behaviour of diff
result = df.diff(axis=axis)
tm.assert_frame_equal(result, expected)