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TST: Test for bug fixed during #22534 discussion #22694

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Merged
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Sep 15, 2018
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TST: Test for bug fixed during #22534 discussion #22694

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230f191
TST: test for correct broadcasting in column-wise op
jbrockmendel Sep 13, 2018
f31407c
fixup typos
jbrockmendel Sep 13, 2018
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12 changes: 12 additions & 0 deletions pandas/tests/frame/test_arithmetic.py
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Original file line number Diff line number Diff line change
Expand Up @@ -100,6 +100,18 @@ def test_df_flex_cmp_constant_return_types_empty(self, opname):
# Arithmetic

class TestFrameFlexArithmetic(object):
def test_df_add_td64_columnwise(self):
# GH#22534 Check that column-wise addition broadcasts correctly
dti = pd.date_range('2016-01-01', periods=10)
tdi = pd.timedelta_range('1', periods=10)
tser = pd.Series(tdi)
df = pd.DataFrame({0: dti, 1: tdi})

result = df.add(tser, axis=0)
expected = pd.DataFrame({0: dti + tdi,
1: tdi + tdi})
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I generally prefer that the expected be as explicit as possible i.e., write out the actual result of those "sums" instead of the expression. You can add a comment if needed to describe that we expected dti + tdi and tdi + tdi.

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I agree with you generally, but these types of tests its ok.

tm.assert_frame_equal(result, expected)

def test_df_add_flex_filled_mixed_dtypes(self):
# GH#19611
dti = pd.date_range('2016-01-01', periods=3)
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