Covering code run by a docker container from tests run on the host

[jclaveau]

I currently use kcov for my tests of a script located on my host. This script run some commands in a docker container, including shared code between the host and the container: https://github.com/jclaveau/docker-php-multiversion

The code executed on the host is well covered but the part which is run via docker exec my_container ... is not as you can see here: https://codecov.io/gh/jclaveau/docker-php-multiversion

This seems logical but produces a kind of false negative and I would like to know if there is a way to merge the covered part of the host with the one of the container or maybe a way to let docker exec provide feedback to kcov.

Thanks in advance and for your work!

[SimonKagstrom]

Well, if you can access the output directories of both the docker run and the host run, then you can do a merge step afterwards:

kcov --merge /tmp/host-output /tmp/docker-output /tmp/merged-output

which should give you the union of both runs in /tmp/merged-output. I'm assuming the host run is placed in /tmp/host-output and that you're able to run kcov in docker as well, and that the host can access it afterwards.

[jclaveau]

Thanks a lot, I'll let you know when it will work!