Docker Selenium Chrome

Using Docker with Selenium and Chrome is a powerful combination for creating isolated, consistent, and scalable testing environments. This setup is particularly beneficial for automated testing in Continuous Integration (CI) pipelines. Here’s how you can set up and use Docker to run Selenium tests in Chrome:

Why Use Docker with Selenium and Chrome

Consistency: Ensures that tests are run in the same environment every time.
Isolation: Tests run in isolated containers, minimizing conflicts between different test runs.
Scalability: Easily scale up or down by running multiple containers in parallel.

Setting Up Docker with Selenium and Chrome

Install Docker:
- Ensure Docker is installed on your machine. You can download it from the Docker website.
Use Selenium Docker Images:
- Selenium provides official Docker images, including one for Chrome (selenium/standalone-chrome).
- These images come preconfigured with everything needed to run Selenium WebDriver.
Pull the Selenium Chrome Docker Image:
- Pull the image from Docker Hub:
  bash
  docker pull selenium/standalone-chrome
Run Selenium Chrome Container:
- Start a container using the image:
  bash
  docker run -d -p 4444:4444 --shm-size="2g" selenium/standalone-chrome
- -d runs the container in detached mode.
- -p maps the port from the container to your host.
- --shm-size sets the shared memory size, which is important for Chrome to run smoothly.

Writing and Running Selenium Tests

Write Your Test Script:
- Write a Selenium test script in your preferred programming language.
- Ensure the script connects to the WebDriver running in the Docker container (e.g., http://localhost:4444/wd/hub).
Run the Test Script:
- Execute the script as you normally would on your host machine.
- The script communicates with the Selenium server in the Docker container, which runs the tests in a Chrome browser.

Example Test Script in Python:

python

from selenium import webdriver
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities

driver = webdriver.Remote(
   command_executor='http://localhost:4444/wd/hub',
   desired_capabilities=DesiredCapabilities.CHROME)

driver.get("http://www.example.com")
# ... your testing actions ...
driver.quit()

Best Practices

Resource Allocation: Ensure your Docker host has enough resources (CPU, memory) to run your test environment.
Network Configuration: Properly configure network settings if your tests need to access applications on your host or the internet.
Cleanup: After your test runs, clean up by stopping and removing the container to free resources.

Demo Day 1 Video:

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