API Test Generator

Generate comprehensive API tests for the specified endpoint.

Target

$ARGUMENTS

Test Strategy for Solo Developers

Create practical, maintainable tests using modern tools:

1. Testing Approach

• Unit tests for validation logic
• Integration tests for full API flow
• Edge case coverage
• Error scenario testing

2. Tools (choose based on project)

• Vitest - Fast, modern (recommended for new projects)
• Jest - Established, widely used
• Supertest - HTTP assertions
• MSW - API mocking

3. Test Coverage

Happy Paths

• Valid inputs return expected results
• Proper status codes
• Correct response structure

Error Paths

• Invalid input validation
• Authentication failures
• Rate limiting
• Server errors
• Missing required fields

Edge Cases

• Empty requests
• Malformed JSON
• Large payloads
• Special characters
• SQL injection attempts
• XSS attempts

4. Test Structure

describe('API Endpoint', () => {
  describe('Success Cases', () => {
    it('should handle valid request', () => {})
    it('should return correct status code', () => {})
  })

  describe('Validation', () => {
    it('should reject invalid input', () => {})
    it('should validate required fields', () => {})
  })

  describe('Error Handling', () => {
    it('should handle server errors', () => {})
    it('should return proper error format', () => {})
  })
})

5. What to Generate

1. Test File - Complete test suite with all scenarios
2. Mock Data - Realistic test fixtures
3. Helper Functions - Reusable test utilities
4. Setup/Teardown - Database/state management
5. Quick Test Script - npm script to run tests

Key Testing Principles

• Test behavior, not implementation
• Clear, descriptive test names
• Arrange-Act-Assert pattern
• Independent tests (no shared state)
• Fast execution (<5s for unit tests)
• Realistic mock data
• Test error messages
• Don't test framework internals
• Don't mock what you don't own
• Avoid brittle tests

Additional Scenarios to Cover

1. Authentication/Authorization

   • Valid tokens
   • Expired tokens
   • Missing tokens
   • Invalid permissions

2. Data Validation

   • Type mismatches
   • Out of range values
   • SQL/NoSQL injection
   • XSS payloads

3. Rate Limiting

   • Within limits
   • Exceeding limits
   • Reset behavior

4. Performance

   • Response times
   • Large dataset handling
   • Concurrent requests

Generate production-ready tests I can run immediately with

npm test

.