Hello tutors
I've constructed an example which shows a problem I'm having testing a real
world program and would like to run it past you.
tutor_question.py
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# -*- coding: utf-8 -*-
import sys
import threading
import time
class Time_Printer(threading.Thread):
def run(self):
for i in range(60):
print('%s - %s' % (self, time.ctime(time.time())))
time.sleep(1)
class Infinite_Loop_Tutor_Question(object):
def start_A(self):
thread = Time_Printer()
thread.daemon = True
thread.start()
print('Started %s' % (thread))
def start_B(self):
thread = Time_Printer()
thread.daemon = True
thread.start()
print('Started %s' % (thread))
def run_forever(self):
self.start_A()
time.sleep(0.5)
self.start_B()
try:
while True:
time.sleep(1)
except KeyboardInterrupt:
print("Caught Keyboard Interrupt...")
sys.exit(0)
if __name__ == '__main__':
infinite_loop = Infinite_Loop_Tutor_Question()
infinite_loop.run_forever()
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In my example above, testing the everything but the run_forever method is
trivial.
So on to my question... The run_forever method essentially just fires up a
bunch of threads to serve various purposes and then waits for CTRL-C to
terminate the entire program. Testing this at the moment is very difficult
because the unit test ends up in the infinite loop. So, would a better idea
be to create an attribute, set it to True and then do
try:
while self.attribute:
time.sleep(1)
except KeyboardInterrupt:
...
My unit test could then set the attribute. However I'd still have the
problem of how I get from the unit test line that fires up the method to
the next line to change the attribute.
So how should the run_forever method be written so that it's testable, or
if it's testable as is, how would I test it?
And please, no comments about syntax, clean exits of threads, thread
communication, resources, or even the need for testing the run_forever
method. In my test I want to test that it makes the relevant calls and then
enters the infinite loop at which point I want to terminate it.
Thanks in advance, and hopefully there are no formatting issues this time.
--
James
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