version: 2.1
orbs:
  # See https://circleci.com/developer/orbs/orb/circleci/ruby
  ruby: circleci/ruby@1.1.2
jobs:                # keyword
  test:              # my name for the job
    parameters:      # keyword
      ruby-version:  # my parameter name
        type: string # type is a keyword
    docker:          # keyword
      - image: cimg/base:stable
    steps:                                       # keyword
      - checkout                                 # magic name
      - ruby/install:                            # ruby/ is from the orb name, install is a command in that orb
          version: << parameters.ruby-version >> # magic nonsense for param subst
      - ruby/install-deps                        # another command from the ruby orb
      - ruby/rspec-test                          # another command from the ruby orb
                                                 # this one will sort out the results.xml file
                                                 # and all that other nonsense.
workflows:              # keyword
  all-rubies:           # my name for the workflow
    jobs:               # keyword
      - test:           # my name for the job
          matrix:       # keyword
            parameters: # keyword
              # All rubies being maintained per this page:
              # https://www.ruby-lang.org/en/downloads/branches/
              ruby-version: [ "2.5", "2.6", "2.7", "3.0" ]