Express
Testing Express with Scenarist
Section titled “Testing Express with Scenarist”Scenarist provides first-class support for testing Express applications at the HTTP level, enabling you to test middleware, route handlers, and external API integrations with real HTTP requests.
The Challenge
Section titled “The Challenge”Testing Express applications traditionally requires choosing between:
- Unit testing route handlers in isolation (misses middleware integration)
- Mocking Express request/response objects (creates distance from production)
- Full E2E tests with browser automation (too slow for comprehensive coverage)
How Scenarist Helps
Section titled “How Scenarist Helps”Scenarist enables HTTP-level integration testing for Express:
- Test middleware chains with real HTTP requests
- Verify route handlers with different external API scenarios
- Test error handling and edge cases comprehensively
- Run parallel tests without interference
Working Example
Section titled “Working Example”See Scenarist in action with a complete Express application:
Explore the Express Example App →
The example demonstrates:
- Testing Express middleware and route handlers
- Test ID isolation for parallel execution
- Request matching for content-based responses
- Sequences for polling and async operations
- Stateful mocks with state capture and injection
- Complete installation and usage instructions
Getting Started
Section titled “Getting Started”Ready to integrate Scenarist into your Express application?