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Issue #19715: Ensure that consecutive calls to monotonic() are monotonic

This commit is contained in:
Victor Stinner 2013-11-23 00:15:27 +01:00
parent 0f57564cac
commit 6c86181cd1
1 changed files with 9 additions and 0 deletions
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9
Lib/test/test_time.py
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@ -367,6 +367,14 @@ class TimeTestCase(unittest.TestCase):
@unittest.skipUnless(hasattr(time, 'monotonic'),
'need time.monotonic')
def test_monotonic(self):
# monotonic() should not go backward
times = [time.monotonic() for n in range(100)]
t1 = times[0]
for t2 in times[1:]:
self.assertGreaterEqual(t2, t1, "times=%s" % times)
t1 = t2
# monotonic() includes time elapsed during a sleep
t1 = time.monotonic()
time.sleep(0.5)
t2 = time.monotonic()
@ -374,6 +382,7 @@ class TimeTestCase(unittest.TestCase):
self.assertGreater(t2, t1)
self.assertAlmostEqual(dt, 0.5, delta=0.2)
# monotonic() is a monotonic but non adjustable clock
info = time.get_clock_info('monotonic')
self.assertTrue(info.monotonic)
self.assertFalse(info.adjustable)