Code Coverage in GitHub Actions

1. Introduction

Code coverage is a critical metric in software development that ensures your tests are adequately covering your codebase. This lesson focuses on how to implement code coverage in your GitHub Actions CI/CD pipeline.

2. What is Code Coverage?

Code coverage measures the percentage of code that is executed during testing. It identifies parts of the code that are not tested, helping developers improve test quality.

3. Setting Up GitHub Actions

To set up GitHub Actions for code coverage, follow these steps:

1. Create a new workflow file in your repository under .github/workflows/.
2. Define your workflow configuration.
3. Add steps for testing and reporting code coverage.

name: CI

on:
  push:
    branches:
      - main

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v2

      - name: Set up Node.js
        uses: actions/setup-node@v2
        with:
          node-version: '14'

      - name: Install dependencies
        run: npm install

      - name: Run tests
        run: npm test
      

4. Integrating Code Coverage Tools

Integrate code coverage tools like Istanbul, Codecov, or Coveralls. Here's an example using Codecov:

      - name: Upload coverage to Codecov
        run: bash <(curl -s https://codecov.io/bash) -f coverage/lcov.info
      

5. Best Practices

Follow these best practices to maintain effective code coverage:

• Set a minimum coverage threshold.
• Regularly review and update your tests.
• Use code coverage reports to identify untested paths.

6. FAQ