xdist does not transfer warnings to the master

[RonnyPfannschmidt]

pytest-dev/pytest#1996 and pytest-dev/pytest#602

example from the pytest issue:

Warnings raised with request.node.warn does not show warnings. -rw does not give any warning output either.

Here is the same test run without and with xdist:

$ py.test unit_tests/
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2166 passed, 78 warnings in 46.73 seconds

$ py.test unit_tests/ -n1
gw0 [2166]
scheduling tests via LoadScheduling
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2166 passed in 48.02 seconds

[Korijn]

Any idea where the source code can be found that "transfers" any errors that have occurred? We might be able to jam the warnings in there too?

[RonnyPfannschmidt]

@Korijn the mechanism we use to transfer test reports is unsuitable for the warnings (which are a side-channel)

but i do wonder if we can extend test report serialization in a way to handle warnings alongside