pytest-xdist generate random & uniqe ports for each test

Question

I'm using pytest-xdist plugin to run some test using the @pytest.mark.parametrize to run the same test with different parameters.

As part of these tests, I need to open/close web servers and the ports are generated at collection time.

xdist does the test collection on the slave and they are not synchronised, so how can I guarantee uniqueness for the port generation.

I can use the same port for each slave but I don't know how to archive this.

what do you mean open/close web servers? a web server is not something you open or close its something you connect to and disconnect from — Jamie Lindsey, Nov 10 '18 at 00:32

score 0 · Accepted Answer · answered Nov 13 '18 at 14:05

I figured that I did not give enough information regarding my issue.

What I did was to create one parameterized test using @pytest.mark.parametrize and before the test, I collect the list of parameters, the collection query a web server and receive a list of "jobs" to process.

Each test contains information on a port that he needs to bind to, do some work and exit because the tests are running in parallel I need to make sure that the ports will be different.

Eventually, I make sure that the job ids will be in the rand on 1024-65000 and used that for the port.

pytest-xdist generate random & uniqe ports for each test

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