Ability to execute code at regular intervals in between unit tests?

[Ignacio Tripodi]

Hi,

I was wondering if there would be a way to tell nose to execute something (a single line of Python would do) at regular intervals (say, once an hour) in between running unit tests. We have an extensive regression tests suite that runs for 12 hours or more with "--randomize", and a few unit tests that fail intermittently due to platform constraints that could be resolved by executing this action at regular intervals. I could hack this into one of our core libraries but I'd rather use a built-in feature, if already present.
Thanks for any feedback you could provide!

-i

[Dan Stromberg]

Perhaps try http://stackoverflow.com/questions/13850512/randomizing-order-of-test-execution-with-nosetests ?

[Corentin Henry]

Hi,


I know, you use nose. But if using nose2 is an alternative, you could do this via a pretty simple plugin.

For example the `startTest` hooks (http://nose2.readthedocs.org/en/latest/dev/hook_reference.html#startTest) does exactly what you're asking for: executing arbitrary code before each test.

Example:


class MyPlugin(nose2.events.Plugin):

    def startTestRun(self, event):
        # this hook is called when the run starts
        # we use it to keep track of the start time
        self.start_time = time.time()
       
    def startTestRun(self, event):
        if time.time() - self.start_time > 3600:
            do_some_stuff()


It has probably been said on the ML before but nose is not actively maintained anymore, so you might want to consider using nose2, which I'm currently maintaining.


Cheers,
Corentin

[Ignacio Tripodi]

Thanks! I'll certainly explore this, as I'm not currently married to nose. Just would need to look at what effort is required to port the current scripts to nose2.

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[Corentin Henry]

For most cases it should work out of the box :)
You can try actually: install nose2, and see if it discovers and run your tests running `nose2`.

See also: https://nose2.readthedocs.org/en/latest/usage.html
For the differences with nose: https://nose2.readthedocs.org/en/latest/differences.html

If you have any problem, don't hesitate to file an issue on github, this is where I'm the most active: https://github.com/nose-devs/nose2/issues