def test_circular_buffer_appendleft():
b = CircularBuffer(3)
b.append(0)
assert list(b) == [0]
b.appendleft(1)
assert list(b) == [1, 0]
b.appendleft(2)
assert list(b) == [2, 1, 0]
b.appendleft(3)
assert list(b) == [3, 2, 1]
b.appendleft(4)
assert list(b) == [4, 3, 2]
b.appendleft(5)
assert list(b) == [5, 4, 3]
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
