Running distributed tests
To test the behavior of the distributed parts of LiberTEM, there are now a
few automated test cases available. Because of the distributed nature of the
tests, they need to be run across multiple network nodes (computers, VMs, or
containers). We ship a
docker-compose configuration to spin up a
scheduler and two workers as separate docker containers.
To run the distributed tests, you need to install (a current version of)
the official docker documentation to get started.
To start the test environment, change to the
packaging/docker/ directory and
run the following:
$ bash dist-build.sh
$ docker-compose down && docker-compose run tests ; docker-compose down
Note that you need to run the above command as a user that can access the docker daemon,
for example by being in the
docker group. The containers are running as long as
docker-compose command is running, so you can stop them using
You can then run the distributed tests using (from the same directory):
$ docker-compose run --rm tests
As we are running the tests in a docker container, the environment of the tests container will automatically match the environment of the workers.
After changing LiberTEM code, you need to rebuild and restart the containers. Just cancel the first
docker-compose up run using CTRL-C and start from the top.
The rebuild should be faster than the initial build, which is accomplished by careful
use of the layer caching feature of docker. This also means that you may need to update
packaging/docker/requirements.txt file by running the provided
update_reqs.sh when the dependencies of LiberTEM change, or when new
versions of dependencies are released. In CI, this is done automatically.