cloud-server/TEST_SUMMARY.md

Test Summary - cloud-server Project

Overview

Automated test suite successfully added to the cloud-server project using Vitest.

Test Files Created

1. vitest.config.ts

Configuration file for Vitest with:

• Node environment setup
• Test file pattern matching (src/**/*.test.ts)
• Coverage configuration with v8 provider
• Exclusions for test files and type definitions

2. src/services/recommendation.test.ts (14 tests)

Tests for RecommendationService class covering:

• Stack validation: Invalid stack component rejection
• Resource calculation: Memory and vCPU requirements based on stack and scale
• Scoring algorithm:
  • Optimal memory fit (40 points)
  • vCPU fit (30 points)
  • Price efficiency (20 points)
  • Storage bonus (10 points)
• Budget filtering: Instance filtering by maximum monthly budget
• Price extraction: Monthly price from multiple sources (column, metadata, hourly calculation)
• Database integration: Query structure and error handling

3. src/middleware/auth.test.ts (21 tests)

Tests for authentication middleware covering:

• API key validation: Valid and invalid key verification
• Constant-time comparison: Timing attack prevention
• Missing credentials: Handling missing API keys and environment variables
• Length validation: Key length mismatch detection
• Special characters: API key with special characters
• Synchronous verification: verifyApiKey function without async operations
• Unauthorized responses: 401 response creation with proper headers
• Security considerations: Timing variance testing, empty string handling

4. src/middleware/rateLimit.test.ts (22 tests)

Tests for rate limiting middleware covering:

• Request counting: New window creation and increment tracking
• Rate limit enforcement: Blocking requests over limit
• Window management: Expiration and reset logic
• Path-specific limits: Different limits for /instances (100/min) and /sync (10/min)
• IP isolation: Independent tracking for different client IPs
• Fail-open behavior: Graceful handling of KV errors
• Client IP extraction: CF-Connecting-IP and X-Forwarded-For fallback
• Invalid data handling: Graceful parsing of malformed JSON
• Rate limit status: Remaining quota and reset time calculation
• Response creation: 429 responses with Retry-After headers

5. src/utils/logger.test.ts (37 tests)

Tests for Logger utility covering:

• Log level filtering: DEBUG, INFO, WARN, ERROR, NONE levels
• Environment configuration: LOG_LEVEL environment variable parsing
• Structured formatting: ISO 8601 timestamps, log levels, context
• Sensitive data masking:
  • Top-level key masking (api_key, api_token, password, secret, token, key)
  • Case-insensitive matching
  • Non-sensitive field preservation
• Factory function: createLogger with context and environment
• Data logging: JSON formatting, nested objects, arrays, null handling
• Edge cases: Empty messages, special characters, very long messages

Test Results

Test Files: 4 passed (4)
Tests: 94 passed (94)
Duration: ~700ms

Test Coverage by Module

Module	File	Tests	Coverage
Services	recommendation.ts	14	Scoring algorithm, validation, database queries
Middleware	auth.ts	21	Authentication, constant-time comparison, security
Middleware	rateLimit.ts	22	Rate limiting, KV integration, fail-open
Utils	logger.ts	37	Log levels, formatting, masking

Running Tests

Run all tests

npm test

Run tests with coverage report

npm run test:coverage

Run tests in watch mode

npm test -- --watch

Run specific test file

npm test -- src/services/recommendation.test.ts

Mock Strategy

All external dependencies are mocked:

• D1Database: Mocked with vi.fn() for database operations
• KVNamespace: Mocked with in-memory Map for rate limiting
• Env: Typed mock objects with required environment variables
• Console: Mocked for logger testing to verify output

Key Testing Patterns

1. Arrange-Act-Assert: Clear test structure for readability
2. Mock isolation: Each test has isolated mocks via beforeEach
3. Edge case coverage: Empty values, special characters, error conditions
4. Security testing: Timing attacks, constant-time comparison
5. Integration validation: Database queries, KV operations, API responses
6. Fail-safe testing: Error handling and graceful degradation

Notes

• Cache service tests are documented in src/services/cache.manual-test.md (requires Cloudflare Workers runtime)
• Tests use Vitest's vi.fn() for mocking (compatible with Jest API)
• D1 and KV operations are mocked since they require Cloudflare Workers environment
• Logger output is captured and validated for proper formatting and masking
• All tests pass with 0 errors and comprehensive coverage of critical paths

Next Steps

1. Coverage reports: Run npm run test:coverage to see detailed coverage metrics
2. E2E tests: Consider adding Playwright tests for full API workflows
3. Performance tests: Add benchmarks for recommendation scoring algorithm
4. Integration tests: Test with real D1 database using Miniflare
5. CI/CD integration: Add test runs to deployment pipeline