def testSamplesWraparound(self):
NUM = sampling.HOST_STATS_AVERAGING_WINDOW + 1
samples = sampling.SampleWindow(
sampling.HOST_STATS_AVERAGING_WINDOW)
class FakeHostSample(object):
counter = 0
def __repr__(self):
return "FakeHostSample(id=%i)" % self.id
def __init__(self, *args):
self.id = FakeHostSample.counter
FakeHostSample.counter += 1
with MonkeyPatchScope([(sampling, 'HostSample', FakeHostSample)]):
hs = sampling.HostMonitor(samples=samples)
for _ in range(NUM):
hs()
first, last, _ = samples.stats()
self.assertEqual(first.id,
FakeHostSample.counter -
sampling.HOST_STATS_AVERAGING_WINDOW)
self.assertEqual(last.id,
FakeHostSample.counter - 1)
def test_last_error(self):
win = sampling.SampleWindow(size=2)
win.append(self._VALUES[0])
win.append(self._VALUES[1])
self.assertEqual(None, win.last(nth=3))
def test_second_last(self):
win = sampling.SampleWindow(size=2)
win.append(self._VALUES[0])
win.append(self._VALUES[1])
self.assertEqual(self._VALUES[0], win.last(nth=2))
def setUp(self):
self._counter = itertools.count(0)
self.win = sampling.SampleWindow(
size=2, timefn=lambda: next(self._counter))
def test_last_error(self):
win = sampling.SampleWindow(size=2)
win.append(self._VALUES[0])
win.append(self._VALUES[1])
_, collected = win.last(nth=3)
assert collected is None
def test_second_last(self):
win = sampling.SampleWindow(size=2)
win.append(self._VALUES[0])
win.append(self._VALUES[1])
_, collected = win.last(nth=2)
assert self._VALUES[0] == collected
def test_window_size_bad_values(self, size):
with pytest.raises(ValueError):
sampling.SampleWindow(size)
def test_last(self):
win = sampling.SampleWindow(size=2)
win.append(self._VALUES[0])
win.append(self._VALUES[1])
_, collected = win.last()
self.assertEqual(self._VALUES[1], collected)
