[issue8687] sched.py module doesn't have a test suite

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> I agree. Are you recommending to take advantage of this and change the
> tests in some way?

Yes, it would allow you to check that if you have e.g. :
- A scheduled in 1 s
- B scheduled in 3 s

sched.py first sleeps for 1 s, then calls A, then sleeps for 2 s, then
calls B

Twisted has a full-blown utility class that they use in many tests,
allowing them to mock time.time():
http://twistedmatrix.com/documents/10.0.0/api/twisted.internet.task.Clock.html
You probably don't need something as sophisticated, the idea of a class
with advance() and time() methods is probably enough.

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