Run from the root of the repo:

$ docker-compose -f tools/docker-compose/unit-tests/docker-compose.yml run unit-tests

This will start the container, install the dependencies, and run the unit tests.

To rebuild:

$ docker-compose -f tools/docker-compose/unit-tests/docker-compose.yml build

If you just want to pop into a shell and poke around, run:

$ docker-compose -f tools/docker-compose/unit-tests/docker-compose.yml run unit-tests bash

If you run into any weirdness, it's probably a good idea to just give up and make clean.