How can I test dependencies in Docker Compose?

How can I test dependencies in Docker Compose?

You can test dependencies in Docker Compose by using the depends_on option to control the startup order of services.

What if I need to wait for a service to be fully ready?

In that case, you can use health checks to ensure that a service is fully up and running before dependent services start.

Can you give me an example of a health check in a Docker Compose file?

Sure! Here's an example:

services:
  web:
    image: my-web-app
    depends_on:
      db:
        condition: service_healthy
  db:
    image: postgres
    healthcheck:
      test: [ 'CMD', 'pg_isready' ]
      interval: 30s
      timeout: 10s
      retries: 5

How do I run the tests after setting up the dependencies?

You can run tests by using a separate service in your Docker Compose file that runs your test commands after the dependencies are ready.