Learning Docker - Second Edition

Using a Docker container as a runtime environment

In the previous section, we built a Docker image to perform the testing. Particularly, in the TDD practice, the unit test cases and the code go through multiple changes. Consequently, the Docker image needs to be built over and over again, which is a daunting task. In this section, we will see an alternative approach in which the Docker container is built with a runtime environment, the development directory is mounted as a volume, and the test is performed inside the container.

During this TDD cycle, if an additional library or update to the existing library is required, then the container will be updated with the required libraries and the updated container will be committed as a new image. ...