def test_bad_operations():
with pytest.raises(ValueError):
RingBuffer(0)
r = RingBuffer()
with pytest.raises(IndexError):
r[1]
with pytest.raises(IndexError):
r[-1]
r.append(1)
with pytest.raises(RingBuffer.InvalidOperation):
del r[0]
def __init__(self, maxlen, initialize=True):
if not maxlen >= 1:
raise ValueError("maxlen must be greater than 0")
self._maxlen = maxlen
self._values = RingBuffer(maxlen, None)
if initialize:
self.add(time.time(), ResourceMonitorBase.ResourceResult(0, ProcessSample.empty(), 0))
def test_append():
r = RingBuffer(5)
for i in xrange(0, 5):
r.append(i)
assert (r[0], r[1], r[2], r[3], r[4]) == (0, 1, 2, 3, 4)
for i in xrange(5, 10):
r.append(i)
assert (r[0], r[1], r[2], r[3], r[4]) == (5, 6, 7, 8, 9)
def test_circularity():
r = RingBuffer(3)
r.append(1)
r.append(2)
r.append(3)
assert 1 in r
assert (r[0], r[3], r[6], r[-3]) == (1, 1, 1, 1)
r.append(4)
assert 1 not in r
assert (r[0], r[3], r[6], r[-3]) == (2, 2, 2, 2)
