How can I run Selenium tests in parallel using Docker?

How can I run Selenium tests in parallel using Docker?

You can run Selenium tests in parallel using Docker by creating a Docker Compose file that defines multiple Selenium containers.

Can you provide an example of a Docker Compose file for this?

Sure! Here's a simple example:

version: '3'
services:
  selenium:
    image: selenium/standalone-chrome
    ports:
      - "4444:4444"
    depends_on:
      - chrome
  chrome:
    image: selenium/chrome
    ports:
      - "5900:5900"

This sets up a Selenium server with Chrome that you can scale.

How do I scale the Selenium service in the Docker Compose file?

You can scale the Selenium service by using the --scale option in the Docker Compose command. For example:

docker-compose up --scale selenium=3

This will run three instances of the Selenium service.