GitHub Actions

Minimal example:

name: test

on:
  push:
  pull_request:

jobs:
  test:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4

      - uses: erlef/setup-beam@v1
        with:
          elixir-version: "1.18.3"
          otp-version: "27.0"

      - name: Cache deps and build
        uses: actions/cache@v4
        with:
          path: |
            deps
            _build
          key: ${{ runner.os }}-mix-${{ hashFiles('mix.lock') }}

      - name: Install deps
        run: mix deps.get

      - name: Run tests with coverage
        run: mix test --cover

      - name: Upload Six report
        uses: actions/upload-artifact@v4
        with:
          name: six-report
          path: .six/coverage.md

Failing CI on low coverage

Either set minimum_coverage in config/test.exs or call:

mix six --minimum-coverage 85

HTML output in CI

Run mix six.html or add the built-in HTML formatter in your config:

config :six,
  formatters: [Six.Formatters.Terminal, Six.Formatters.Agent, Six.Formatters.HTML]

Partitioned test suites

If your CI splits tests across partitions, export coverage from each partition and merge with mix six --import-cover ... in a follow-up job.