0
0
Cypresstesting~8 mins

Custom plugin development in Cypress - Framework Patterns

Choose your learning style9 modes available
Framework Mode - Custom plugin development
Folder Structure
cypress/
├── e2e/                  # Test specs
│   └── example.cy.js
├── support/              # Support files and commands
│   ├── commands.js       # Custom commands
│   └── e2e.js            # Support file loaded before tests
├── plugins/              # Custom plugins
│   └── index.js          # Plugin entry point
cypress.config.js         # Cypress configuration file
package.json             # Project dependencies and scripts
Test Framework Layers
  • Plugins Layer: Contains custom plugin code to extend Cypress functionality, located in cypress/plugins/index.js.
  • Support Layer: Houses reusable commands and setup code, e.g., commands.js for custom commands.
  • Test Specs Layer: Contains the actual test files inside cypress/e2e/.
  • Configuration Layer: Central place for Cypress settings in cypress.config.js.
  • Utilities Layer: Optional helpers or utilities can be added inside cypress/support/ or a separate folder.
Configuration Patterns
  • Environment Variables: Use env property in cypress.config.js to store environment-specific data like URLs or credentials.
  • Browser Selection: Configure browsers via CLI or cypress.config.js to run tests on Chrome, Firefox, etc.
  • Plugin Configuration: Export a function in cypress/plugins/index.js that receives on and config objects to register event handlers or modify config dynamically.
  • Secrets Management: Use environment variables or CI secrets to avoid hardcoding sensitive data.
Test Reporting and CI/CD Integration
  • Test Reporting: Integrate reporters like mochawesome or junit via cypress.config.js to generate readable test reports.
  • CI/CD Integration: Run Cypress tests in pipelines (GitHub Actions, Jenkins, GitLab CI) using commands like npx cypress run.
  • Plugin Usage in CI: Ensure plugins are loaded correctly in CI environment by verifying cypress/plugins/index.js is included and configured.
  • Artifacts: Save screenshots, videos, and reports as build artifacts for debugging failed tests.
Best Practices for Custom Plugin Development
  1. Keep Plugins Focused: Each plugin should have a single responsibility to keep code clean and maintainable.
  2. Use Event Listeners Properly: Register event handlers in cypress/plugins/index.js using the on argument to hook into Cypress lifecycle events.
  3. Do Not Modify Tests Directly: Plugins should extend Cypress capabilities without changing test logic.
  4. Document Plugin APIs: Clearly comment plugin functions and expected inputs/outputs for easier team collaboration.
  5. Handle Errors Gracefully: Plugins should catch and log errors without crashing the test run.
Self Check

Where in this folder structure would you add a new plugin that modifies the browser launch behavior?

Key Result
Organize Cypress tests with clear separation of plugins, support, and test specs for scalable custom plugin development.