def test_buf_set_value_idx_negative():
lst = ['a', 'b', 'c']
buf = Buf(lst)
with buf.record() as modifications:
buf[-1] = 'hello'
assert lst == ['a', 'b', 'hello']
buf.apply(modifications)
assert lst == ['a', 'b', 'c']
def test_buf_insert_with_negative():
lst = ['a', 'b', 'c']
buf = Buf(lst)
with buf.record() as modifications:
buf.insert(-1, 'q')
assert lst == ['a', 'b', 'q', 'c']
buf.apply(modifications)
assert lst == ['a', 'b', 'c']
def test_buf_del_with_negative():
lst = ['a', 'b', 'c']
buf = Buf(lst)
with buf.record() as modifications:
del buf[-1]
assert lst == ['a', 'b']
buf.apply(modifications)
assert lst == ['a', 'b', 'c']
def test_buf_pop_idx():
lst = ['a', 'b', 'c']
buf = Buf(lst)
with buf.record() as modifications:
buf.pop(1)
assert lst == ['a', 'c']
buf.apply(modifications)
assert lst == ['a', 'b', 'c']
def test_buf_append():
lst = ['a', 'b', 'c']
buf = Buf(lst)
with buf.record() as modifications:
buf.append('q')
assert lst == ['a', 'b', 'c', 'q']
buf.apply(modifications)
assert lst == ['a', 'b', 'c']
def test_buf_multiple_modifications():
lst = ['a', 'b', 'c']
buf = Buf(lst)
with buf.record() as modifications:
buf[1] = 'hello'
buf.insert(1, 'ohai')
del buf[0]
assert lst == ['ohai', 'hello', 'c']
buf.apply(modifications)
assert lst == ['a', 'b', 'c']