How to work with .env.test with Docker

[ArthurZaharov]

No description provided.

[AleksandrSeleznev]

It works fine for now.
Also, if I'm not mistaken, we have to take a look to docker-compose.yml in the environment section.
The issue is that Docker by default fetch ENV variables from .env during building.
And, for example, if you have some variable defined in environment section and this variable has two different values in .env and in, for example, .env.test files, value would have precedence which is taking place in .env file.

Example:

  environment:
    - MAILER_SENDER_ADDRESS

.env file:
[email protected]

.env.test file:
[email protected]

In the docker container, the MAILER_SENDER_ADDRESS variable will be set as [email protected].

@EvgeniyEsaulkov could you confirm this, please?

[AleksandrSeleznev]

Here is the article about this:
https://docs.docker.com/compose/environment-variables/

[EvgeniyEsaulkov]

@EvgeniyEsaulkov could you confirm this, please?

Absolutely. Variables defined in docker-compose.yml are system variables for the container and will be fetched from the custom .env file only using the --env-file option - https://docs.docker.com/compose/environment-variables/#using-the---env-file--option

Rest of variables that are loaded to Rails via dotenv gem are available the same way as we work without Docker.