This as an example of using the Docker Puppeteer docker image to run Mocha tests against a linked Docker Compose web service, and capturing a screenshot into a local ./screenshots directory.
# Clone this example
git clone https://github.com/buildkite/docker-puppeteer.git
cd docker-puppeteer/example
# Build and run the example tests
docker-compose -f docker-compose.integration-tests.yml run tests
# See the screen that was generated
ls screenshots/