GitHub Action + Rails test example

test.yml

# .github/workflows/test.yml 

name: test

on: [push]

env:
  RUBY_VERSION: 2.7.2
  NODE_VERSION: 14.15.5
  RAILS_ENV: test
  TZ: '/usr/share/zoneinfo/Asia/Tokyo'

jobs:
  prepare:
    name: prepare test
    runs-on: ubuntu-latest
    timeout-minutes: 30

    steps:
      - uses: actions/checkout@v2

      - name: setup Ruby
        uses: ruby/setup-ruby@v1
        with:
          ruby-version: ${{ env.RUBY_VERSION }}
          bundler-cache: true

      # 注釈) Nodeやyarn, キャッシュの設定は都度調整してください
      - name: setup Node
        uses: actions/setup-node@v2
        with:
          node-version: ${{ env.NODE_VERSION }}

      - name: install yarn
        run: npm i -g yarn@1.22.5

      - name: Get yarn cache directory path
        id: yarn-cache-dir-path
        run: echo "::set-output name=dir::$(yarn cache dir)"

      - name: Cache yarn cache directory
        uses: actions/cache@v2.1.5
        with:
          path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
          key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
          restore-keys: |
            ${{ runner.os }}-yarn-

      - name: Cache node_modules
        uses: actions/cache@v2.1.5
        with:
          path: node_modules
          key: ${{ runner.os }}-node-modules-${{ hashFiles('**/yarn.lock') }}
          restore-keys: |
            ${{ runner.os }}-node-modules-

      - name: yarn install
        run: yarn install --frozen-lockfile

      - name: asset cache
        uses: actions/cache@v2.1.5
        with:
          path: |
            public/assets
            tmp/cache/assets/sprockets
          key: asset-cache-${{ runner.os }}-${{ github.ref }}-${{ github.sha }}
          restore-keys: |
            asset-cache-${{ runner.os }}-${{ github.ref }}-${{ github.sha }}
            asset-cache-${{ runner.os }}-${{ github.ref }}-
            asset-cache-${{ runner.os }}-

      - name: assets precompile
        run: bundle exec rake assets:precompile --trace

      - name: cache bundle.js
        uses: actions/cache@v2.1.5
        with:
          path: ./public/packs
          key: bundle-js-${{ github.sha }}

      # (補足) Projectによって適切に変更する. webpack buildプロセス。
      - name: yarn run release
        run: yarn run release


  backend-test:
    name: ${{ matrix.target }} ${{ matrix.index }}
    needs: prepare
    runs-on: ubuntu-latest
    timeout-minutes: 30

    env:
      CI_NUMBER_OF_NODES: 8 # NOTE: 並列に実行する数. ここを増やしたらmatrix.indexも増やすこと.
      PARALLEL_TESTS_CONCURRENCY: 2 # paralell_test gemを使用している場合
      # 省略... 

    strategy:
      fail-fast: false
      matrix:
        target: [backend]
        index: [0, 1, 2, 3, 4, 5, 6, 7] # NOTE: 要素数は CI_NUMBER_OF_NODES の個数分にすること

    services:
      mysql:
        image: mysql:5.7
        env:
          # (Projectによって適切に設定する)
          # MYSQL_ROOT_PASSWORD: xxx
          # MYSQL_DATABASE: xxx
        ports:
          - 3306:3306
        options: --health-cmd "mysqladmin ping" --health-interval 10s --health-timeout 5s --health-retries 10

    steps:    
      # RDSのMySQL-5.7と同じオプションにする
      # mysql --ssl-mode=DISABLE --protocol=tcp --host 127.0.0.1 --user=root --password=${DB_PASSWORD} -e "SELECT @@global.sql_mode"
      # 2021-04-14の結果: ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
      # (補足) Projectによって適切に変更する。GitHub Actionsではserviceの起動時にdocker runの引数を上書きできない為...   
      - name: set MySQL sql_mode
        run: |
          mysql --ssl-mode=DISABLE --protocol=tcp --host 127.0.0.1 --user=root --password=${DB_PASSWORD} mysql <<SQL
          SET GLOBAL sql_mode = 'NO_ENGINE_SUBSTITUTION';
          SET GLOBAL character_set_server = 'utf8mb4';
          SET GLOBAL collation_server = 'utf8mb4_general_ci';
          SQL

      - uses: actions/checkout@v2

      - name: setup Ruby
        uses: ruby/setup-ruby@v1
        with:
          ruby-version: ${{ env.RUBY_VERSION }}
          bundler-cache: true

      - name: Database Setup (includes db:seed)
        env:
          DB_PORT: ${{ job.services.mysql.ports[3306] }}
        run: |
          bundle exec rake parallel:setup[$PARALLEL_TESTS_CONCURRENCY] --trace

      - name: asset cache
        uses: actions/cache@v2.1.5
        with:
          path: |
            public/assets
            tmp/cache/assets/sprockets
          key: asset-cache-${{ runner.os }}-${{ github.ref }}-${{ github.sha }}

      - name: cache bundle.js
        uses: actions/cache@v2.1.5
        with:
          path: ./public/packs
          key: bundle-js-${{ github.sha }}

      - name: Run RSpec
        env:
          DB_PORT: ${{ job.services.mysql.ports[3306] }}
          CI_NODE_INDEX: ${{ matrix.index }}
          # 他, クレデンシャル等のenvを ${{ secrets.HOGE_ENV }} 経由で渡す

        # 注釈) parallel_rspecを使っていない場合は bundle exec rspec -- $TEST_FILES
        run: |
          TEST_FILES="$(ruby spec/spec_splitter.rb --glob='spec/**/*_spec.rb' --node-count=$CI_NUMBER_OF_NODES --node-index=$CI_NODE_INDEX)"
          bundle exec parallel_rspec -n $PARALLEL_TESTS_CONCURRENCY -- $TEST_FILES

https://gist.github.com/ykpythemind/f51f8a84e96ce6c9bd42d30621071480