example.yaml

name: Example Workflow

on: push

env:
  total-runners: 5

jobs:
  runner-indexes:
    runs-on: ubuntu-latest
    name: Generate runner indexes
    outputs:
      json: ${{ steps.generate-index-list.outputs.json }}
    steps:
      - id: generate-index-list
        run: |
          MAX_INDEX=$((${{ env.total-runners }}-1))
          INDEX_LIST=$(seq 0 ${MAX_INDEX})
          INDEX_JSON=$(jq --null-input --compact-output '. |= [inputs]' <<< ${INDEX_LIST})
          echo "::set-output name=json::${INDEX_JSON}"

  run-parallel-tests:
    runs-on: ubuntu-latest
    name: "Runner #${{ matrix.runner-index }}: Run test suite in parallel"
    needs:
      - runner-indexes
    strategy:
      matrix:
        runner-index: ${{ fromjson(needs.runner-indexes.outputs.json) }}
    steps:
      - uses: actions/checkout@v2
        with:
          repository: eliotsykes/rspec-rails-examples
          path: examples/
      - uses: chaosaffe/split-tests@v1-alpha.1
        id: split-tests
        name: Split tests
        with:
          glob: examples/spec/**/*_spec.rb
          split-total: ${{ env.total-runners }}
          split-index: ${{ matrix.runner-index }}
      - run: 'echo "This runner will execute the following tests: ${{ steps.split-tests.outputs.test-suite }}"'