config.yml

version: 2.1

default_version: &default_version 1.8.1
default_steps: &default_steps
  - run: mix test

jobs:
  build:
    parameters:
      version:
        description: Elixir version
        type: string
        default: *default_version
      execute:
        description: What steps to execute after build
        type: steps
        default: *default_steps

    parallelism: 1
    docker:
      - image: elixir:<< parameters.version >>

    steps:
      - checkout

      - restore_cache:
          key: testing-elixir-v<< parameters.version >>

      - run: mix local.hex --force
      - run: mix local.rebar --force
      - run: MIX_ENV=test mix do deps.get --only test, deps.compile, compile

      - save_cache:
          key: testing-elixir-v<< parameters.version >>
          paths:
            - _build
            - deps
            - ~/.mix

      - steps: << parameters.execute >>

workflows:
  version: 2.1
  testing_all_versions:
    jobs:
      - build:
          name: "Test in elixir 1.8.1"
          version: 1.8.1
      - build:
          name: "Test in elixir 1.7.4"
          version: 1.7.4
      - build:
          name: "Test in elixir 1.6.6"
          version: 1.6.6
      - build:
          name: "Test in elixir 1.5.3"
          version: 1.5.3
      - build:
          name: "Test in elixir 1.4.5"
          version: 1.4.5
      - build:
          name: "Test in elixir 1.3.4"
          version: 1.3.4
  validate_code_quality:
    jobs:
      - build:
          name: "Tests coverge"
          execute:
            - run:
                command: MIX_ENV=test mix coveralls.circle
                environment:
                  COVERALLS_REPO_TOKEN: 5wI8JIzygEDIF4A03KNIKWdOmVK2A8dMC
      - build:
          name: "Code quality"
          execute:
            - run: mix format --check-formatted