[TIP] Starting pytest from a microservice framework

Bruno Oliveira nicoddemus at gmail.com
Thu Jan 4 01:34:21 PST 2018

Hi Arun,

you can control all the above in your implementation of pytest_runtestloop.


Em qui, 4 de jan de 2018 05:39, arun kali raja <arunsep886 at gmail.com>

> Thanks a lot Bruno,
> One more requirement i have is to execute a set of test cases repeatedly
> in a loop for a particular amount of time.. say 24 hours..
> As per my understanding, in pytest when I do a loop, the different test
> item objects are created according to the number of the loop at the startup
> phase itself.. so the tests will be named test1[1/n],test[2/n]...test[n/n].
> Now if i want to run for a particular duration how do i achieve that??
> one way is to have user mark each testcase with the amount of time it will
> take to complete and then decide how many iterations each of them should be
> run.. Is there any other way i can achieve it?
> Also i see that the order of execution of testcases is also not
> maintained.. say i have test_1 run 3 times in a loop.. i see test_1[3/3]
> run first and then test_1[1/3] is executed..
> Regards
> Arun Kaliraja.B
> On 04-Jan-2018 00:24, "Bruno Oliveira" <nicoddemus at gmail.com> wrote:
> Hi Arun,
> You can call pytest.main() directly instead of the command line, but using
> the command line in a sub-process is also reasonable IMHO (you might want
> to send a full log of the run back to the client for example).
> In order to stop test mid-execution you will need to implement your own
> pytest_runtestloop hook in a conftest.py file that will verify some
> condition between each run:
> https://github.com/pytest-dev/pytest/blob/08997279f40f9c972c116195cc4d83f33ef17b0e/_pytest/main.py#L155
> To keep things simple, upon each request for a new test session, create a
> temporary directory and put your conftest.py file in there along with the
> tests:
> /tmp/run0/
>   conftest.py
>   test_1.py
>   test_2.py
>   ...
> When receiving a request to stop the current run, you write a special
> named file (".stop" for example), which your hook checks periodically: when
> it is found it stops the current execution (probably by raising
> session.Interrupted).
> Hope this helps!
> Cheers,
> On Wed, Jan 3, 2018 at 11:06 AM arun kali raja <arunsep886 at gmail.com>
> wrote:
>> Hi,
>> I have a requirement where in i want to start pytest from a microservice
>> framework.
>> So the user will be sending a restAPI request and based on that i should
>> be able to do the service will start a pytest session.
>> i have couple of questions on how to achieve this.
>> 1. All pytest invocations i see is from cmd line.. can i invoke the
>> pytest run from within another piece of code?
>> 2. If yes then can i run it as a seperate thread/process all together
>> from the service?
>> 3. If yes to that also.. suppose i want to handle rest requests like stop
>> testrun in between how do i achieve it.. i dont want to kill the thread..
>> once the ongoing test is completed then i should stop the execution
>> gracefully. python threading library offers event objects to achieve such
>> things.. i am not sure if i will be able to do such things in a
>> conftest.py..
>> Regards
>> Arun Kaliraja.B
>> --
>> அன்புடன்,
>> பா. அருண் காளி ராசா
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