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Run jobs in parallel

Step 1: Add a job to run the Javascript tests

CircleCI allows us to choose a different Docker image for each job. For example, The config.yml file below specifies two jobs, named: go and javascript

jobs:
  go:
    docker:
      - image: golang:1.8.3
    steps:
      - run:
          name: Install dependencies
          command: go get ./...
      - run:
          name: Run Go tests
          command: go test ./...

  javascript:
    docker:
      - image: node:8.6.0
    steps:
      - run: 
          name: Install dependencies
          command: yarn install
      - run: 
          name: Run javascript tests
          command: yarn test

The go job runs the steps in the golang:1.8.3 Docker image, an image with Go development tools installed. While the javascript job runs the javascript unit tests in the node:8.6.0 Docker image, an image with Node and Yarn installed. Because we can specify a Docker image for each job, we can choose an image with only the minimal tools installed, keeping each job light-weight and fast.

Exercise 1.1: Add a new job to your .circleci/config.yml file which will run the yarn install and yarn test commands. Make sure you retrieve the sourcecode which was checked out in the checkout job. Take a look at the existing scala job to get an idea. Also, make sure you execute the commands in the right working directory.

Step 2: Run jobs in parallel

CircleCI makes it possible to run multiple jobs in parallel. For example, the following workflow will execute the go and javascript jobs in parallel:

workflows:
  commit:
    jobs:
      - checkout
      - go:
          requires:
            - checkout
      - javascript:
          requires:
            - checkout
      - deploy:
          requires:
            - go
            - javascript

It is possible to fork, i.e. execute the go and the javascript job after the completion of the checkout job. And it is possible to join, i.e. execute the deploy job after the completion of both the go and the javascript jobs. This makes it possible to significantly reduce the time needed to run our tests.

Exercise 1.2: Change the workflow in your .circleci/config.yml file to run the javascript job in parallel with the scala job. Push your changes to GitHub and test your javascript job.