def test_circular_buffer_extendleft_long():
b = CircularBuffer(5, [-1, -2, -3])
b.extendleft(range(7))
assert list(b) == [6, 5, 4, 3, 2]
def test_circular_buffer_extendleft_short():
b = CircularBuffer(4, [-1, -2, -3])
b.extendleft(range(2))
assert list(b) == [1, 0, -1, -2]
