How to use parallel_tests in github actions - ruby-on-rails

Question

I'm trying to use parallel_tests in my github action to run my test suite but I was not able to find a proper solution.
The official docs has one but it is for gitlab:
https://github.com/grosser/parallel_tests/wiki/Distributed-Parallel-Tests-on-CI-systems
Any help would be appreciated thanks!

Answer 1

Here's a sample workflow you can drop into .github/workflows/tests.yml:
name: Rails Tests
on: push
env:
PGHOST: localhost
PGUSER: postgres
RAILS_ENV: test
jobs:
build:
runs-on: ubuntu-latest
strategy:
fail-fast: true
matrix:
# Set N number of parallel jobs you want to run
# Remember to update ci_node_index below to 0..N-1
ci_node_total: [6]
# set N-1 indexes for parallel jobs
# When you run 2 parallel jobs then first job will have index 0, the second job will have index 1 etc
ci_node_index: [0, 1, 2, 3, 4, 5]
services:
postgres:
image: postgres:11.5
ports: ["5432:5432"]
options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
redis:
image: redis:5
ports: ["6379:6379"]
steps:
- uses: actions/checkout#v1
- uses: ruby/setup-ruby#v1
with:
bundler-cache: true
- name: Set node version (from .tool-versions)
run: echo "NODE_VERSION=$(cat .tool-versions | grep nodejs | sed 's/^nodejs //')" >> $GITHUB_ENV
- uses: actions/setup-node#v2
with:
node-version: ${{ env.NODE_VERSION }}
- uses: bahmutov/npm-install#v1
- name: Install PostgreSQL client
run: |
sudo apt-get -yqq install libpq-dev postgresql-client
- name: Test Prep
env:
CI_NODE_INDEX: ${{ matrix.ci_node_index }}
run: |
bundle exec rake parallel:create["1"] parallel:load_schema["1"]
- name: Run tests
env:
RAILS_MASTER_KEY: ${{ secrets.RAILS_MASTER_KEY }}
CI_NODE_TOTAL: ${{ matrix.ci_node_total }}
CI_NODE_INDEX: ${{ matrix.ci_node_index }}
run : |
bundle exec parallel_test spec/ -n $CI_NODE_TOTAL --only-group $CI_NODE_INDEX --type rspec

Answer 2

This was what I used to get it solved. Note: There are some other omitted parts such as the setup for ruby, postgresql, sqlite, etc.
name: "Lint and Test"
jobs:
test:
runs-on: ubuntu-latest
timeout-minutes: 30
services:
redis:
image: redis
ports: ["6379:6379"]
postgres:
ports: ["5432:5432"]
steps:
//omitted setups
- name: Setup Parallel Database
env:
RAILS_ENV: test
PGHOST: localhost
PGUSER: postgres
run: |
cp config/database.yml.example config/database.yml
bundle exec rake parallel:create
bundle exec rake parallel:rake[db:schema:load] || true
- name: Build and test with rspec
env:
RAILS_ENV: test
PGHOST: localhost
PGUSER: postgres
APP_REDIS_URL: redis://localhost:6379
MINIMUM_COVERAGE: 80
run: |
bundle exec parallel_rspec --verbose spec