How to run TestCafe runner class with Docker
You need to define the full path to your test files or change your working directory to the /tests directory in the container.
Besides, this step is intended to run the in-memory display server. You may skip it if you are going to run tests in a headless browser.
Here is a command that works on my side with the Runner class:
docker run -v //c/Users/User/test-docker:/tests -w=/tests -it --entrypoint node testcafe/testcafe /tests/test-run.js