test.yml

name: Test

on:
  push:
    branches:
      - "main"
  pull_request:

jobs:
  main:
    timeout-minutes: 10

    runs-on: ${{ matrix.os }}

    strategy:
      fail-fast: false
      matrix:
        os: [ubuntu-latest, macOS-latest, windows-latest]
        node-version: [20, 22, 24]

    env:
      ELM_HOME: "${{ github.workspace }}/elm-stuff/elm-home"

    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-node@v4
        with:
          node-version: "${{ matrix.node-version }}"

      - name: Number of CPUs
        shell: bash
        run: |
          node -p 'require("os").cpus().length'

      - name: Cache node_modules
        id: cache-node_modules
        uses: actions/cache@v4
        with:
          path: node_modules
          key: internal-node_modules-${{ matrix.os }}-${{ matrix.node-version }}-${{ hashFiles('package.json', 'package-lock.json') }}

      - name: Cache ELM_HOME
        uses: actions/cache@v4
        with:
          path: "${{ env.ELM_HOME }}"
          key: elm-${{ matrix.os }}-${{ hashFiles('elm-tooling.json') }}

      - if: steps.cache-node_modules.outputs.cache-hit != 'true'
        run: npm ci --no-audit
        env:
          NO_ELM_TOOLING_INSTALL: 1

      - run: npx elm-tooling install

      # The idea is that this will install all packages mentioned in test
      # fixtures, so that nothing needs to be downloaded while the tests
      # run, which could result in flaky tests.
      - run: npm run install-test-elm-dependencies
        working-directory: tests/install-packages

      # Retry failing tests, as a stopgap while fixing flaky tests.
      # However, retry is useless until this bug is fixed: https://github.com/vitest-dev/vitest/issues/6589
      - run: npx vitest --coverage # --retry=4