#atom

Practice of frequently merging code changes with automated testing

Core Idea: Continuous Integration (CI) is a development practice where developers regularly merge their code changes into a central repository, followed by automated builds and tests to detect and address integration issues early.

Key Elements

• Core Principles:

  • Frequent code integration (at least daily)
  • Automated building and testing
  • Fast feedback on code quality
  • Maintaining a stable main branch
  • Treating build failures as highest priority issues

• Implementation Components:

  • Version Control: Centralized repository (Git, SVN)
  • CI Server: Automation orchestration (Jenkins, GitHub Actions)
  • Build Process: Compile and package code
  • Automated Tests: Unit, integration, and functional tests
  • Code Quality Checks: Linting, security scanning, and static analysis
  • Notification System: Real-time feedback to developers

• CI Workflow:

  1. Developer commits code to version control
  2. CI server detects the change and triggers a build
  3. Code is compiled and built in a clean environment
  4. Automated tests run against the build
  5. Code quality tools analyze the codebase
  6. Results are reported to the team
  7. If successful, code moves to the next stage (e.g., staging)

• Best Practices:

  • Maintain a single source repository
  • Automate the build process
  • Make builds self-testing
  • Keep the build fast (under 10 minutes)
  • Test in a production-like environment
  • Make build results visible to everyone
  • Fix broken builds immediately
  • Commit to the main branch daily

• CI Server Configuration Example:

  # GitHub Actions CI workflow example
  name: CI Pipeline
  
  on:
    push:
      branches: [ main, develop ]
    pull_request:
      branches: [ main, develop ]
  
  jobs:
    build-and-test:
      runs-on: ubuntu-latest
      
      steps:
      - uses: actions/checkout@v3
      
      - name: Setup Node.js
        uses: actions/setup-node@v3
        with:
          node-version: '18'
          cache: 'npm'
      
      - name: Install dependencies
        run: npm ci
      
      - name: Run linter
        run: npm run lint
      
      - name: Run tests
        run: npm test
      
      - name: Build application
        run: npm run build
  

- **Benefits**:
    - Early detection of integration issues
    - Reduced integration risk and effort
    - Continuous verification of code quality
    - Immediate feedback to developers
    - Always having a deployable build
    - Better project visibility for all stakeholders

## Connections

- **Related Concepts**: Continuous Delivery (next step after CI), DevOps Practices (broader methodology)
- **Broader Context**: Agile Software Development (complementary methodology)
- **Applications**: GitHub Actions for Linting (specific CI implementation)
- **Components**: Automated Testing (core CI component), Version Control (prerequisite for CI)

## References

1. "Continuous Integration: Improving Software Quality and Reducing Risk" by Paul Duvall
2. "Continuous Delivery" by Jez Humble and David Farley
3. "Jenkins: The Definitive Guide" by John Ferguson Smart

#continuous-integration #devops #automation #software-development #testing

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**Connections:**
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**Sources:**
- From: Syntax - Lint como un desarrollador senior con eslint + husky + lint staged + acciones de github