Docker for Test Automation: Containerizing Your Playwright and Selenium Suites

Quick Answer: Docker containerizes your test environment so tests run identically on any machine. For Playwright: use the official mcr.microsoft.com/playwright image. For Selenium: use selenium/standalone-chrome.

Why Docker for Test Automation?

• Consistency: Same browser version and dependencies everywhere
• Reproducibility: “Works on my machine” is eliminated
• Isolation: Clean environment each run
• CI/CD speed: Docker images cache layers

Playwright Docker Setup

# Dockerfile
FROM mcr.microsoft.com/playwright:v1.40.0-jammy
WORKDIR /app
COPY package*.json ./
RUN npm ci
COPY . .
CMD ["npx", "playwright", "test"]

Selenium Docker Setup

# docker-compose.yml
version: '3.8'
services:
  selenium-chrome:
    image: selenium/standalone-chrome:latest
    ports:
      - "4444:4444"
    shm_size: '2gb'
  tests:
    build: .
    depends_on:
      - selenium-chrome
    environment:
      - SELENIUM_HUB_URL=http://selenium-chrome:4444/wd/hub

Best Practices

1. Use official images: Microsoft and Selenium maintained images
2. Cache npm layers: Copy package.json first, then npm ci
3. Set shm_size: Browsers need shared memory (2gb)
4. Multi-stage builds: Smaller images for faster CI

Training Resources

Master test automation with SkilBrill Playwright Training.

FAQ

Do I need Docker for test automation?

Not required, but highly recommended for CI/CD pipelines and consistent environments.

Written by SkilBrill Training Institute

September 18, 2026 · 1 min read