name: Test in Nix
on:
  pull_request:
  push:
    branches:
      - master

jobs:
  run:
    name: Build and test
    strategy:
      fail-fast: false
      matrix:
        os:
          - macos-latest
          - ubuntu-latest
        ocaml-compiler:
          - 4_11
          - 4_12
          - 4_13
    runs-on: ${{ matrix.os }}
    steps:
    - uses: actions/checkout@v2
    - name: Setup Nix
      uses: cachix/install-nix-action@v15
      with:
        nix_path: nixpkgs=channel:nixos-21.11
        extra_nix_config: |
          trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
          substituters = https://cache.nixos.org/
          max-jobs = auto
          cores = 0
    - run: nix-shell --argstr ocamlVersion ${{ matrix.ocaml-compiler }} --run 'dune runtest'