Error connecting to Redis when running tests

[Zelzahn]

When I try to run the tests I get the following error: redis.exceptions.ConnectionError: Error 111 connecting to localhost:6379. Connection refused. But the Docker container is running according to how it is described in the DEVELOPMENT.md.

[lardbit]

@Zelzahn you're right - I forgot to specify a needed update in the docker-compose.yml to fully open up the redis port (for development).

The DEVELOPMENT.md should be updated to reflect that.

[lardbit]

E.g. use ports vs expose in the docker-compose file will truly open the redis port which is required when developing/testing.