[2rsf]

> It creates “containerized” versions of all the external parts we use. It is mocking but on the outside of our code. Our API thinks it is in a real physical environment.

While I am in favor of a Dockerized solution, and have used it extensively, the reasoning above is not entirely correct. You can Mock without the application noticing it in different ways, the simplest being using of a separate process running the Mock logic.

The befit of Docker is the same as in other contexts- you get a packed versioned solution that is easy to deploy and manage