def test_circular_buffer_appends_pops_partial():
b = CircularBuffer(5)
b.append(1)
b.append(2)
assert list(b) == [1, 2]
assert b.pop() == 2
assert list(b) == [1]
b.append(3)
b.append(4)
assert list(b) == [1, 3, 4]
assert b.popleft() == 1
assert b.popleft() == 3
assert list(b) == [4]
b.appendleft(5)
assert list(b) == [5, 4]
assert b.popleft() == 5
def test_circular_buffer_appends_pops_overfull():
b = CircularBuffer(5, range(7))
b.append(-1)
b.append(-2)
assert list(b) == [4, 5, 6, -1, -2]
assert b.pop() == -2
assert b.popleft() == 4
assert list(b) == [5, 6, -1]
b.append(-3)
b.append(-4)
assert list(b) == [5, 6, -1, -3, -4]
b.appendleft(-5)
assert list(b) == [-5, 5, 6, -1, -3]
assert b.popleft() == -5
assert b.popleft() == 5
assert list(b) == [6, -1, -3]
b.appendleft(-6)
assert list(b) == [-6, 6, -1, -3]
assert b.popleft() == -6
def test_circular_buffer_len_overfull_pop():
b = CircularBuffer(5, range(7))
b.pop()
assert len(b) == 4
def test_circular_buffer_pop_overfull():
b = CircularBuffer(5, range(7))
assert b.pop() == 6
assert list(b) == [2, 3, 4, 5]
assert b.pop() == 5
assert list(b) == [2, 3, 4]
def test_circular_buffer_pop_partial():
b = CircularBuffer(5, range(3))
assert b.pop() == 2
assert list(b) == [0, 1]
assert b.pop() == 1
assert list(b) == [0]
def test_circular_buffer_pop_empty_invalid():
b = CircularBuffer(5)
with pytest.raises(IndexError):
b.pop()
