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TST: Fix test assertion #23357

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Oct 26, 2018
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TST: Fix test assertion #23357

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6 changes: 4 additions & 2 deletions pandas/tests/extension/base/setitem.py
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Original file line number Diff line number Diff line change
Expand Up @@ -27,18 +27,20 @@ def test_setitem_sequence(self, data, box_in_series):
@pytest.mark.parametrize('as_array', [True, False])
def test_setitem_sequence_mismatched_length_raises(self, data, as_array):
ser = pd.Series(data)
original = ser.copy()
value = [data[0]]
if as_array:
value = data._from_sequence(value)

xpr = 'cannot set using a {} indexer with a different length'
with tm.assert_raises_regex(ValueError, xpr.format('list-like')):
ser[[0, 1]] = value
assert ser._values[[0, 1]] == value
# Ensure no modifications made before the exception
self.assert_series_equal(ser, original)

with tm.assert_raises_regex(ValueError, xpr.format('slice')):
ser[slice(3)] = value
assert ser._values[slice(3)] == value
self.assert_series_equal(ser, original)

def test_setitem_empty_indxer(self, data, box_in_series):
if box_in_series:
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