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Test Coverage Reports/Analytics API Coverage

Analytics API Test Coverage Summary

Overview

This document provides a comprehensive overview of the test coverage for the Analytics API tracking route in the Elite Events application.

Generated: November 28, 2025 Status: COMPREHENSIVE - 100% test coverage achieved Total API Tests: 39 tests Coverage Achievement: 100% statements, 100% branches, 100% functions, 100% lines

Test Coverage Summary

Overall Analytics API Coverage

File      | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
----------|---------|----------|---------|---------|-------------------
All files |     100 |      100 |     100 |     100 |
 route.ts |     100 |      100 |     100 |     100 |

Test Breakdown by Route

/api/analytics/track - Event Tracking Route

File: src/app/api/analytics/track/route.ts Test File: src/app/api/analytics/track/__tests__/route.test.ts Test Count: 39 tests Coverage: 100% (all metrics) Runtime: Edge

Detailed Test Scenarios

1. Successful Event Tracking (4 tests)

Tests for valid event tracking with various field combinations:

  • ✅ Tracks a complete event with all fields (category, action, label, value, timestamp, userAgent, url)
  • ✅ Tracks event without optional label field
  • ✅ Tracks event without optional value field
  • ✅ Tracks event with minimal required fields (category and action only)

Coverage: Ensures all optional field combinations work correctly and logger is called with proper context.

2. Event Category Tracking (5 tests)

Tests for different event categories commonly used in the application:

  • ✅ Tracks product events (e.g., product views)
  • ✅ Tracks cart events (e.g., add to cart, remove from cart)
  • ✅ Tracks checkout events (e.g., checkout completion)
  • ✅ Tracks user engagement events (e.g., scroll depth, time on page)
  • ✅ Tracks error events (e.g., API failures)

Coverage: Validates that all event categories are logged correctly with the format "category.action".

3. Validation - Missing Required Fields (7 tests)

Tests for proper validation of required fields:

  • ✅ Returns 400 when category is missing
  • ✅ Returns 400 when action is missing
  • ✅ Returns 400 when both category and action are missing
  • ✅ Returns 400 when category is empty string
  • ✅ Returns 400 when action is empty string
  • ✅ Returns 400 when category is null
  • ✅ Returns 400 when action is null

Coverage: Ensures proper validation error messages ("Missing required fields: category and action") and 400 status codes. Logger should not be called for validation failures.

4. Validation - Edge Cases (7 tests)

Tests for handling edge cases and unusual but valid input:

  • ✅ Accepts whitespace in category and action
  • ✅ Accepts numeric value of 0
  • ✅ Accepts negative numeric value (e.g., discounts)
  • ✅ Accepts very large numeric value (999999.99)
  • ✅ Accepts very long string values (1000+ characters)
  • ✅ Accepts special characters in strings (e.g., !@#$%^&*(), HTML tags)
  • ✅ Accepts unicode characters (e.g., Chinese characters, emojis)

Coverage: Tests boundary conditions and ensures the API doesn't reject valid but unusual input.

5. Data Structure Validation (2 tests)

Tests for proper data handling and logging:

  • ✅ Includes all provided fields in logged data
  • ✅ Preserves data types in logging (numbers remain numbers, strings remain strings)

Coverage: Ensures data integrity throughout the logging pipeline.

6. Error Handling (4 tests)

Tests for proper error handling and logging:

  • ✅ Returns 500 on JSON parse error
  • ✅ Handles missing request body
  • ✅ Handles empty request body
  • ✅ Logs errors with proper context

Coverage: Tests exception handling, error responses, and error logging with the logger.error method.

7. Multiple Concurrent Requests (1 test)

Tests for handling concurrent traffic:

  • ✅ Handles multiple concurrent tracking requests (10 simultaneous requests)

Coverage: Ensures the API can handle concurrent requests without issues.

8. User Agent Tracking (1 test)

Tests for tracking different user agents:

  • ✅ Tracks different user agents (Chrome, Safari, Firefox, Postman)

Coverage: Validates that various user agent strings are captured correctly.

9. URL Tracking (2 tests)

Tests for tracking different URL formats:

  • ✅ Tracks various URL patterns (root, product pages, search with params, etc.)
  • ✅ Accepts absolute URLs (https://example.com/...)

Coverage: Ensures URLs of different formats are tracked correctly.

10. Timestamp Handling (2 tests)

Tests for timestamp format acceptance:

  • ✅ Accepts ISO 8601 timestamp format
  • ✅ Accepts different timestamp formats (ISO, UTC, Unix timestamp)

Coverage: Validates flexibility in timestamp format acceptance.

11. Response Format (2 tests)

Tests for proper response formatting:

  • ✅ Returns proper success response format ({ success: true }, 200 status)
  • ✅ Returns proper error response format ({ error: "message" }, 4xx/5xx status)

Coverage: Ensures consistent response structure and proper Content-Type headers.

12. Edge Runtime Compatibility (1 test)

Tests for edge runtime compliance:

  • ✅ Works with edge runtime constraints (no Node.js-specific APIs)

Coverage: Validates that the implementation is compatible with Vercel Edge Runtime.

13. Performance and Scalability (1 test)

Tests for performance under load:

  • ✅ Handles rapid successive requests (100 requests completed within 5 seconds)

Coverage: Basic performance test to ensure the API can handle high request volumes.

API Endpoint Details

POST /api/analytics/track

Purpose: Tracks user events for analytics purposes.

Request Body (TrackEventPayload):

{
  category: string;      // Required - Event category (e.g., "product", "cart")
  action: string;        // Required - Event action (e.g., "view", "add")
  label?: string;        // Optional - Additional context
  value?: number;        // Optional - Numeric value (can be 0, negative, or positive)
  timestamp: string;     // Event timestamp
  userAgent: string;     // User's browser/client
  url: string;          // Page URL where event occurred
}

Success Response (200):

{
  "success": true
}

Error Responses:

  • 400: Validation error (missing category or action) 
    {
  "error": "Missing required fields: category and action"
}
  • 500: Server error (JSON parse error, unexpected exceptions) 
    {
  "error": "Failed to track event"
}

Current Implementation:

  • Logs events using the logger utility (context: "ANALYTICS")
  • Does not persist to database (commented out Prisma code)
  • Runs on Edge runtime for optimal performance
  • No authentication required (public endpoint)

Test Implementation Details

Mocking Strategy

Logger Mock:

jest.mock("@/lib/logger", () => ({
  logger: {
    info: jest.fn(),
    error: jest.fn(),
    warn: jest.fn(),
    debug: jest.fn(),
  },
}));

Why: The analytics route uses the logger for tracking events. Mocking allows verification that events are logged correctly without actually writing to console.

Test Helpers Used

  • createMockRequest(): Creates mock NextRequest objects with specified method, URL, body, and headers
  • parseJsonResponse(): Parses and returns typed JSON responses from NextResponse objects

Edge Cases Covered

  1. Empty/null values: Tests ensure proper validation for missing required fields
  2. Special characters: Tests verify XSS-style strings don't break the API
  3. Unicode support: Tests confirm international character support
  4. Numeric boundaries: Tests validate 0, negative, and very large numbers
  5. String length: Tests check handling of very long strings (1000+ chars)
  6. Concurrent requests: Tests ensure thread-safety and concurrent handling
  7. Malformed JSON: Tests verify proper error handling for invalid JSON
  8. Performance: Tests confirm reasonable response times under load

Coverage Achievements

Statements: 100%

  • All code paths executed
  • All variable assignments tested
  • All function calls verified

Branches: 100%

  • All conditional paths tested (if/else, ternary operators)
  • Validation logic fully covered
  • Error handling paths verified

Functions: 100%

  • POST handler fully tested
  • All error paths executed

Lines: 100%

  • Every line of code executed during tests
  • No dead code detected

Integration Points

Dependencies

  1. @/lib/logger: Mocked in tests, used to log events
  2. next/server: Uses NextResponse for responses
  3. Edge runtime: Configured to run on edge for performance

Future Database Integration

The route includes commented-out Prisma code for database persistence:

// await prisma.analyticsEvent.create({
//   data: {
//     category,
//     action,
//     label,
//     value,
//     timestamp: new Date(timestamp),
//     userAgent,
//     url,
//   },
// });

When implementing:

  • Add Prisma mock to tests
  • Add tests for database errors
  • Add tests for successful persistence
  • Test data transformation for database
  • Test transaction handling

Recommendations

Current Status: PRODUCTION READY

The analytics tracking API has comprehensive test coverage and is ready for production use with logging-only functionality.

Future Enhancements

  1. Database Persistence

    • Implement Prisma model for AnalyticsEvent
    • Add database persistence tests
    • Test transaction handling and rollback scenarios
    • Add tests for duplicate event handling

  2. Advanced Validation

    • Add schema validation using Zod
    • Implement rate limiting tests
    • Add tests for malicious payloads
    • Consider max string length limits

  3. Analytics Dashboard

    • Add GET endpoint for retrieving analytics
    • Implement aggregation queries
    • Add date range filtering
    • Add pagination tests

  4. Authentication

    • Consider if tracking should require authentication
    • Add tests for authenticated vs anonymous tracking
    • Test user ID association

  5. Performance Monitoring

    • Add more extensive load tests (1000+ requests)
    • Test memory usage under sustained load
    • Add response time benchmarks
    • Monitor Edge runtime performance

Testing Best Practices Demonstrated

  1. Comprehensive Coverage: 39 tests covering all scenarios
  2. Clear Organization: Tests grouped by functionality
  3. Edge Cases: Special attention to boundary conditions
  4. Error Handling: All error paths tested
  5. Mocking Strategy: Proper isolation using mocks
  6. Performance: Basic performance testing included
  7. Type Safety: Proper TypeScript types used throughout
  8. Clear Assertions: Each test has specific, meaningful assertions
  9. Setup/Teardown: Proper beforeEach for test isolation

Running Tests

Run Analytics Tests

npm test -- src/app/api/analytics/track/__tests__/route.test.ts

Run with Coverage

npm test -- src/app/api/analytics/track/__tests__/route.test.ts --coverage --collectCoverageFrom="src/app/api/analytics/track/route.ts"

Watch Mode

npm test -- src/app/api/analytics/track/__tests__/route.test.ts --watch

Conclusion

The Analytics API tracking route has achieved 100% test coverage across all metrics with 39 comprehensive tests. The test suite covers:

  • ✅ All happy path scenarios
  • ✅ All error conditions
  • ✅ Edge cases and boundary conditions
  • ✅ Concurrent request handling
  • ✅ Performance under load
  • ✅ Edge runtime compatibility
  • ✅ Data validation and transformation
  • ✅ Error logging and reporting

The API is production-ready for logging-based analytics tracking and has a clear path forward for database persistence when needed.

Test Quality: HIGH Coverage: 100% Maintainability: HIGH Documentation: COMPLETE

Documentation | Elite Events | Philip Rehberger