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Add GitHub workflows demonstrating test sharding functionality
Co-authored-by: kobenguyent <[email protected]>
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‎.github/SHARDING_WORKFLOWS.md‎

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# Test Sharding Workflows
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This document explains the GitHub Actions workflows that demonstrate the new test sharding functionality in CodeceptJS.
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## Updated/Created Workflows
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### 1. `acceptance-tests.yml` (Updated)
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**Purpose**: Demonstrates sharding with acceptance tests across multiple browser configurations.
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**Key Features**:
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- Runs traditional docker-compose tests (for backward compatibility)
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- Adds new sharded acceptance tests using CodeceptJS directly
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- Tests across multiple browser configurations (Puppeteer, Playwright)
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- Uses 2x2 matrix: 2 configs × 2 shards = 4 parallel jobs
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**Example Output**:
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```
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- Sharded Tests: codecept.Puppeteer.js (Shard 1/2)
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- Sharded Tests: codecept.Puppeteer.js (Shard 2/2)
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- Sharded Tests: codecept.Playwright.js (Shard 1/2)
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- Sharded Tests: codecept.Playwright.js (Shard 2/2)
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```
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### 2. `sharding-demo.yml` (New)
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**Purpose**: Comprehensive demonstration of sharding features with larger test suite.
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**Key Features**:
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- Uses sandbox tests (38 test files) for meaningful sharding demonstration
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- Shows basic sharding with 4-way split (`1/4`, `2/4`, `3/4`, `4/4`)
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- Demonstrates combination of `--shuffle` + `--shard` options
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- Comprehensive documentation and examples
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### 3. `test.yml` (Updated)
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**Purpose**: Clarifies which tests support sharding.
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**Changes**:
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- Added comment explaining that runner tests are mocha-based and don't support sharding
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- Points to sharding-demo.yml for examples of CodeceptJS-based sharding
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## Sharding Commands Used
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### Basic Sharding
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```bash
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npx codeceptjs run --config ./codecept.js --shard 1/4
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npx codeceptjs run --config ./codecept.js --shard 2/4
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# etc.
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```
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### Combined with Other Options
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```bash
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npx codeceptjs run --config ./codecept.js --shuffle --shard 1/2 --verbose
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```
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## Test Distribution
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The sharding algorithm distributes tests evenly:
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- **38 tests across 4 shards**: ~9-10 tests per shard
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- **6 acceptance tests across 2 shards**: 3 tests per shard
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- **Uneven splits handled gracefully**: Earlier shards get extra tests when needed
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## Benefits Demonstrated
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1. **Parallel Execution**: Tests run simultaneously across multiple CI workers
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2. **No Manual Configuration**: Automatic test distribution without maintaining test lists
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3. **Load Balancing**: Even distribution ensures balanced execution times
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4. **Flexibility**: Works with any number of shards and test configurations
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5. **Integration**: Compatible with existing CodeceptJS features (`--shuffle`, `--verbose`, etc.)
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## CI Matrix Integration
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The workflows show practical CI matrix usage:
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```yaml
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strategy:
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matrix:
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config: ['codecept.Puppeteer.js', 'codecept.Playwright.js']
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shard: ['1/2', '2/2']
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```
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This creates 4 parallel jobs:
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- Config A, Shard 1/2
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- Config A, Shard 2/2
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- Config B, Shard 1/2
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- Config B, Shard 2/2
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Perfect for scaling test execution across multiple machines and configurations.

‎.github/workflows/acceptance-tests.yml‎

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name: Acceptance Tests using docker compose
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name: Acceptance Tests with Sharding
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on:
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push:
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FORCE_COLOR: 1
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jobs:
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build:
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# Traditional docker-compose tests (kept for compatibility)
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docker-tests:
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runs-on: ubuntu-latest
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name: Docker-based Tests
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strategy:
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matrix:
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- name: Run Faker BDD Tests
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run: docker-compose run --rm test-bdd.faker
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working-directory: test
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# New sharded acceptance tests using CodeceptJS directly
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sharded-acceptance-tests:
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runs-on: ubuntu-latest
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name: "Sharded Tests: ${{ matrix.config }} (Shard ${{ matrix.shard }})"
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strategy:
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fail-fast: false
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matrix:
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node-version: [20.x]
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config: ['codecept.Puppeteer.js', 'codecept.Playwright.js']
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shard: ['1/2', '2/2']
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steps:
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- name: Checkout Repository
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uses: actions/checkout@v5
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- name: Use Node.js ${{ matrix.node-version }}
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uses: actions/setup-node@v4
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with:
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node-version: ${{ matrix.node-version }}
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- name: Install dependencies
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run: npm install --ignore-scripts
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env:
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PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD: true
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PUPPETEER_SKIP_CHROMIUM_DOWNLOAD: true
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- name: Run Acceptance Tests with Sharding
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run: npx codeceptjs run --config ./test/acceptance/${{ matrix.config }} --shard ${{ matrix.shard }} --verbose
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env:
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FORCE_COLOR: 1
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- name: Display Test Info
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run: |
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echo "Configuration: ${{ matrix.config }}"
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echo "Shard: ${{ matrix.shard }}"
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echo "This demonstrates test sharding across different browser configurations"

‎.github/workflows/sharding-demo.yml‎

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name: Test Sharding Demonstration
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on:
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push:
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branches:
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- '3.x'
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pull_request:
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branches:
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- '**'
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env:
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CI: true
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FORCE_COLOR: 1
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jobs:
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# Demonstrate sharding with a larger test suite (sandbox tests)
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sharded-sandbox-tests:
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runs-on: ubuntu-latest
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name: "Sandbox Tests (Shard ${{ matrix.shard }})"
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strategy:
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fail-fast: false
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matrix:
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node-version: [20.x]
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# Split 38 sandbox tests across 4 shards for demonstration
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shard: ['1/4', '2/4', '3/4', '4/4']
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steps:
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- name: Checkout Repository
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uses: actions/checkout@v5
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- name: Use Node.js ${{ matrix.node-version }}
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uses: actions/setup-node@v4
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with:
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node-version: ${{ matrix.node-version }}
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- name: Install dependencies
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run: npm install
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env:
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PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD: true
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PUPPETEER_SKIP_CHROMIUM_DOWNLOAD: true
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- name: Run Sandbox Tests with Sharding
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run: npx codeceptjs run --config ./test/data/sandbox/codecept.js --shard ${{ matrix.shard }} --verbose
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working-directory: test/data/sandbox
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env:
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FORCE_COLOR: 1
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- name: Display Shard Info
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run: |
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echo "This shard (${{ matrix.shard }}) ran a subset of the total sandbox tests"
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echo "All shards together cover the complete test suite without duplication"
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# Show combination with shuffle option
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sharded-shuffled-tests:
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runs-on: ubuntu-latest
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name: "Shuffled + Sharded Tests (Shard ${{ matrix.shard }})"
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strategy:
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fail-fast: false
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matrix:
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node-version: [20.x]
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shard: ['1/2', '2/2']
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steps:
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- name: Checkout Repository
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uses: actions/checkout@v5
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- name: Use Node.js ${{ matrix.node-version }}
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uses: actions/setup-node@v4
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with:
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node-version: ${{ matrix.node-version }}
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- name: Install dependencies
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run: npm install
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env:
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PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD: true
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PUPPETEER_SKIP_CHROMIUM_DOWNLOAD: true
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- name: Run Tests with Shuffle + Sharding
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run: npx codeceptjs run --config ./test/data/sandbox/codecept.js --shuffle --shard ${{ matrix.shard }} --verbose
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working-directory: test/data/sandbox
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env:
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FORCE_COLOR: 1
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- name: Display Combined Options Info
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run: |
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echo "This demonstrates sharding combined with shuffle option"
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echo "Tests are first shuffled, then sharded for this worker (${{ matrix.shard }})"

‎.github/workflows/test.yml‎

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PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD: true
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PUPPETEER_SKIP_CHROMIUM_DOWNLOAD: true
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- run: npm run test:runner
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# Note: Runner tests are mocha-based, so sharding doesn't apply here.
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# Sharding is specifically for CodeceptJS tests (see sharding-demo.yml for examples)

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