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TST: verify we can add and subtract from indices (#8142) #16629

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Merged
merged 1 commit into from
Jun 8, 2017
Merged

TST: verify we can add and subtract from indices (#8142) #16629

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19 changes: 19 additions & 0 deletions pandas/tests/indexes/test_base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1800,6 +1800,25 @@ def test_string_index_repr(self):

assert coerce(idx) == expected

@pytest.mark.parametrize('dtype', [np.int64, np.float64])
@pytest.mark.parametrize('delta', [1, 0, -1])
def test_addsub_arithmetic(self, dtype, delta):
# GH 8142
delta = dtype(delta)
idx = pd.Index([10, 11, 12], dtype=dtype)
result = idx + delta
expected = pd.Index(idx.values + delta, dtype=dtype)
tm.assert_index_equal(result, expected)

# this subtraction used to fail
result = idx - delta
expected = pd.Index(idx.values - delta, dtype=dtype)
tm.assert_index_equal(result, expected)

tm.assert_index_equal(idx + idx, 2 * idx)
tm.assert_index_equal(idx - idx, 0 * idx)
assert not (idx - idx).empty


class TestMixedIntIndex(Base):
# Mostly the tests from common.py for which the results differ
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