How can I use Docker Compose for Selenium testing?

How can I use Docker Compose for Selenium testing?

You can use Docker Compose to set up a Selenium testing environment by defining services for Selenium Hub and browser nodes in a docker-compose.yml file.

Can you provide an example of a docker-compose.yml file for Selenium?

Sure! Here's a simple example:

version: '3'
services:
  selenium-hub:
    image: selenium/hub
    ports:
      - "4444:4444"
  chrome:
    image: selenium/node-chrome
    depends_on:
      - selenium-hub
    environment:
      - HUB_HOST=selenium-hub
  firefox:
    image: selenium/node-firefox
    depends_on:
      - selenium-hub
    environment:
      - HUB_HOST=selenium-hub

How do I run the tests once the environment is set up?

You can run your tests by executing your test scripts in a separate container that connects to the Selenium Hub. Use the command docker-compose up to start the services.

What if I want to run tests in parallel?

You can scale the browser nodes in your docker-compose.yml file by adding the deploy section with replicas, or simply use the --scale option when running docker-compose up.