test_and_lint.yml

name: Test & Lint

on:
  push:
    branches:
      - master
  pull_request:

jobs:
  # Only run lint and formatting jobs on latest OTP/Elixir versions.
  lint:
    name: Lint
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: erlef/setup-beam@v1
        with:
          otp-version: 27
          elixir-version: 1.17

      - uses: actions/cache@v4
        env:
          base-key: 27-1.17
        with:
          path: |
            _build
            deps
          # Generate a hash of the OTP version and Elixir version
          key: ${{ env.base-key }}-mix-${{ hashFiles('**/mix.lock') }}
          restore-keys: ${{ env.base-key }}-mix

      - run: mix deps.get
        name: Fetch Dependencies

      - run: mix credo --strict
        name: Lint (credo)

      - run: mix format --check-formatted
        name: Lint (mix format)

      - run: mix dialyzer
        name: Run dialyzer

  test:
    name: Run Unit tests
    runs-on: ubuntu-20.04
    strategy:
      matrix:
        elixir-version: ['1.14', '1.15', '1.16', '1.17']
        otp-version: ['25', '26', '27']
        exclude:
          - elixir-version: '1.14'
            otp-version: '27'
          - elixir-version: '1.15'
            otp-version: '27'
          - elixir-version: '1.16'
            otp-version: '27'
    steps:
      - uses: actions/checkout@v4

      - uses: erlef/setup-beam@v1
        with:
          otp-version: ${{ matrix.otp-version }}
          elixir-version: ${{ matrix.elixir-version }}

      - uses: actions/cache@v4
        with:
          path: _build
          # Generate a hash of the OTP version and Elixir version
          key: ${{ matrix.otp-version }}-${{ matrix.elixir-version }}-mix-${{ hashFiles(format('{0}{1}', github.workspace, '/mix.lock')) }}
          restore-keys: ${{ matrix.otp-version }}-${{ matrix.elixir-version }}-mix

      - run: mix deps.get
        name: Fetch Dependencies

      - run: mix test --no-start
        name: Run Tests