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API Contract Tests Implementation Summary

Overview

This PR implements automated contract tests that verify important listener API responses maintain their expected structure. This addresses approximately 2% of the overall API contract testing requirement as requested.

What Was Done

1. Created API Contract Test Suite

File: listener/src/api/__tests__/api-contract.test.ts

A comprehensive test suite with 14 passing tests covering:

Health & Status Endpoints (5 tests)

  • ✅ GET /health - Returns expected structure with all required fields
  • ✅ GET /health - Includes tracking headers (X-Request-Id, X-Correlation-Id)
  • ✅ GET /api/status - Returns expected structure with timestamp and contracts
  • ✅ GET /api/status - Contract status includes address and paused fields
  • ✅ GET /api/indexing/health - Returns indexing status with all required fields

Event Management (3 tests)

  • ✅ GET /api/events - Returns expected structure (success, data wrapper)
  • ✅ GET /api/events - Event objects have all required fields with correct types
  • ✅ GET /api/events - Respects limit query parameter

Batch Validation (2 tests)

  • ✅ POST /api/notifications/validate-batch - Valid batch returns success structure
  • ✅ POST /api/notifications/validate-batch - Invalid batch returns error details

API Features (4 tests)

  • ✅ API versioning - Accepts /api/v1/* routes
  • ✅ API versioning - Includes X-API-Version header on all responses
  • ✅ CORS - Handles OPTIONS requests correctly
  • ✅ Error handling - Returns 404 for unknown routes

2. Fixed Bug in request-id.ts

File: listener/src/utils/request-id.ts

Fixed a syntax error where a closing brace was missing in the generateCorrelationId() function, which was preventing the code from compiling.

3. Documentation

File: listener/src/api/__tests__/README.md

Created comprehensive documentation including:

  • Overview of contract testing purpose
  • Current test coverage details
  • Instructions for running tests
  • Response format documentation
  • Roadmap for future expansion (remaining 98%)
  • Contributing guidelines

Test Results

Test Suites: 1 passed, 1 total
Tests:       14 passed, 14 total
Time:        ~8s

All tests verify:

  • ✅ Response structure matches documentation
  • ✅ Required fields are present
  • ✅ Field types are correct
  • ✅ Error responses follow expected formats

Key Testing Patterns Established

1. Response Envelope Verification

All API responses use a standardized envelope:

// Success
{ success: true, data: {...}, meta?: {...} }

// Error
{ success: false, error: { code, message, details? } }

2. Field Presence & Type Checking

expect(res.body).toHaveProperty('success');
expect(typeof body.data.timestamp).toBe('string');
expect(Array.isArray(body.data.events)).toBe(true);

3. ISO 8601 Timestamp Validation

expect(new Date(body.timestamp).toISOString()).toBe(body.timestamp);

4. Mock Setup for Isolated Testing

  • Mocked Stellar SDK to avoid external dependencies
  • Mocked database connections
  • Mocked event registry for predictable test data

Branch & Repository

Future Work (Remaining 98%)

The README documents a comprehensive roadmap for expanding test coverage to include:

  • Scheduled notification endpoints (5 endpoints)
  • User preferences (2 endpoints)
  • Notification history (1 endpoint with pagination)
  • Notification search (2 endpoints)
  • Template management (7 endpoints)
  • Analytics (2 endpoints)
  • Webhooks (1 endpoint with signature verification)
  • Rate limiting (1 endpoint)

Each endpoint should have tests for:

  • Success cases with valid data
  • Error cases with invalid data
  • Edge cases (empty arrays, null values, etc.)
  • Query parameter handling
  • Pagination where applicable

Benefits

Immediate Benefits

  1. Breaking Change Detection - Tests fail when documented response structures change unexpectedly
  2. Documentation Validation - Ensures API documentation matches actual behavior
  3. Regression Prevention - Catches unintended changes during refactoring
  4. Development Confidence - Developers can safely modify code knowing tests will catch issues

Long-term Benefits

  1. API Stability - Encourages thoughtful API design changes
  2. Client Protection - External API consumers are protected from breaking changes
  3. Faster Debugging - Clear test failures pinpoint exact contract violations
  4. Living Documentation - Tests serve as executable documentation

Running the Tests

# Navigate to listener directory
cd listener

# Install dependencies (if not already done)
npm install

# Run the contract tests
npm test -- api-contract.test.ts

# Run with coverage
npm test -- api-contract.test.ts --coverage

Acceptance Criteria Met

✅ Core API responses have contract tests - Implemented for 5 critical endpoints
✅ Required fields are verified - All tests check for presence and types of required fields
✅ Error responses are covered - Tests verify error structures for invalid inputs
✅ Tests fail when documented response structures change unexpectedly - All assertions validate exact structure

Notes

  • Tests are isolated and don't require external services (Stellar RPC, database, Discord)
  • All dependencies are properly mocked for fast, reliable test execution
  • Tests follow Jest best practices with clear describe/it blocks
  • TypeScript typing ensures type safety throughout tests
  • Tests can run in CI/CD pipelines without environment dependencies

Next Steps for PR Review

  1. Review test coverage and assertions
  2. Verify tests align with API documentation
  3. Confirm mock setup is appropriate
  4. Validate README documentation
  5. Merge to main branch after approval
  6. Consider adding contract tests to CI/CD pipeline
  7. Plan next iteration to expand coverage beyond 2%