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Using matrix jobs

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Matrix jobs provide a way to run a job multiple times with arguments. Arguments are supplied using parameters. There are many uses for this feature, including testing on multiple operating systems and against different language or library versions.

Use matrix jobs to run multiple OS tests

In the following example, the test job is run across a Linux Docker container, Linux VM, and macOS environments, using two different versions of Node.js. On each run of the test job, different parameters are passed to set both the OS and the Node.js version:

version: 2.1

orbs:
  node: circleci/node@4.7

executors:
  docker: # Docker using the Base Convenience Image
    docker:
      - image: cimg/base:stable
        auth:
          username: mydockerhub-user
          password: $DOCKERHUB_PASSWORD  # context / project UI env-var reference
  linux: # a Linux VM running Ubuntu 20.04
    machine:
      image: ubuntu-2004:202107-02
  macos: # macos executor running Xcode
    macos:
      xcode: 14.2.0

jobs:
  test:
    parameters:
      os:
        type: executor
      node-version:
        type: string
    executor: << parameters.os >>
    steps:
      - checkout
      - node/install:
          node-version: << parameters.node-version >>
          install-yarn: true

workflows:
  all-tests:
    jobs:
      - test:
          matrix:
            parameters:
              os: [docker, linux, macos]
              node-version: ["14.17.6", "16.9.0"]

List jobs that will run

The expanded version of this matrix runs the following list of jobs under the all-tests workflow:

    - test-14.17.6-docker
    - test-16.9.0-docker
    - test-14.17.6-linux
    - test-16.9.0-linux
    - test-14.17.6-macos
    - test-16.9.0-macos

Next steps

For full details of the matrix jobs specification, see the Configuration Reference.

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