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TST: Test timedelta arithmetic (#9396) #14906

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Merged
merged 1 commit into from
Dec 18, 2016
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TST: Test timedelta arithmetic (#9396) #14906

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22 changes: 22 additions & 0 deletions pandas/tseries/tests/test_timedeltas.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1203,6 +1203,28 @@ def test_implementation_limits(self):
with tm.assertRaises(OverflowError):
Timedelta(max_td.value + 1, 'ns')

def test_timedelta_arithmetic(self):
data = pd.Series(['nat', '32 days'], dtype='timedelta64[ns]')
deltas = [timedelta(days=1), Timedelta(1, unit='D')]
for delta in deltas:
result_method = data.add(delta)
result_operator = data + delta
expected = pd.Series(['nat', '33 days'], dtype='timedelta64[ns]')
tm.assert_series_equal(result_operator, expected)
tm.assert_series_equal(result_method, expected)

result_method = data.sub(delta)
result_operator = data - delta
expected = pd.Series(['nat', '31 days'], dtype='timedelta64[ns]')
tm.assert_series_equal(result_operator, expected)
tm.assert_series_equal(result_method, expected)
# GH 9396
result_method = data.div(delta)
result_operator = data / delta
expected = pd.Series([np.nan, 32.], dtype='float64')
tm.assert_series_equal(result_operator, expected)
tm.assert_series_equal(result_method, expected)


class TestTimedeltaIndex(tm.TestCase):
_multiprocess_can_split_ = True
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