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TEST-COVERAGE-SUMMARY.md

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Test Coverage Summary

Date: November 14, 2025 Version: 0.3.0 Status: Unable to generate full coverage report (Jest worker memory issues)

Test Status

✅ Passing Test Suites (9/11)

  • concurrency.test.ts - 30 tests (WAL, retry, WriteQueue)
  • Database.test.ts - 80+ tests (CRUD, transactions, export/import)
  • Database-merge.test.ts - 33 tests (mergeNode, mergeEdge, indexes)
  • NodeQuery.test.ts - 70+ tests (fluent API, filtering, pagination)
  • Transaction.test.ts - 20 tests (commit, rollback, savepoints)
  • NodeQuery-both-direction.test.ts - 9 tests (bidirectional queries)
  • TraversalQuery-paths.test.ts - 11 tests (path finding)
  • job-pipeline.test.ts - 13 integration tests
  • validation.test.ts - 24 tests (type validation, schema)

❌ Failing Test Suites (2/11)

  • TraversalQuery.test.ts - FAIL (Jest worker out of memory)
  • graph-operations.test.ts - FAIL (Jest worker terminated)

Total: 294 tests passing (Jest worker crashes prevent full run)

Source Code Coverage

Source Files (9 files):

src/
├── core/
│   ├── Database.ts        ✅ Well tested (80+ tests)
│   ├── Schema.ts          ⚠️  Coverage unknown
│   └── Transaction.ts     ✅ Well tested (20 tests)
├── query/
│   ├── NodeQuery.ts       ✅ Well tested (79+ tests)
│   └── TraversalQuery.ts  ⚠️  Memory issue prevents coverage
├── utils/
│   ├── concurrency.ts     ✅ Well tested (30 tests)
│   ├── serialization.ts   ⚠️  Coverage unknown
│   └── validation.ts      ✅ Well tested (24 tests)
└── types/
    └── merge.ts           ⚠️  Type definitions (no tests needed)

Coverage Assessment (Estimated)

Based on test structure and source files:

File Tests Estimated Coverage Status
Database.ts 80+ ~90% ✅ GOOD
NodeQuery.ts 79+ ~95% ✅ EXCELLENT
Transaction.ts 20 ~85% ✅ GOOD
concurrency.ts 30 ~90% ✅ GOOD
validation.ts 24 ~80% ✅ GOOD
TraversalQuery.ts 11+ ~60%? ⚠️ UNKNOWN (memory crash)
Schema.ts 0 direct ~40%? ⚠️ LOW (used by Database)
serialization.ts 0 direct ~70%? ⚠️ MEDIUM (used by export/import)
merge.ts N/A N/A ℹ️ Type definitions only

Overall Estimated Coverage: ~75-80%

Confidence: Medium - Based on test count and file complexity, not actual instrumentation data

Known Issues

1. Jest Worker Memory Crashes

FATAL ERROR: Ineffective mark-compacts near heap limit
Allocation failed - JavaScript heap out of memory

Affected:

  • TraversalQuery.test.ts (hits memory limit during coverage run)
  • graph-operations.test.ts (worker terminated)

Root Cause: Likely extensive graph traversal operations creating too many objects during coverage instrumentation

Impact: Cannot generate full lcov coverage report

2. Missing Coverage Configuration

# jest.config.js has coverage threshold:
coverageThreshold: {
  global: {
    branches: 80,
    functions: 80,
    lines: 80,
    statements: 80
  }
}

Status: Cannot verify if thresholds are met due to memory crashes

Files Likely Missing Tests

1. Schema.ts - No direct tests

  • Used indirectly through Database tests
  • Schema validation logic may not be fully covered
  • Recommendation: Add direct Schema.test.ts

2. serialization.ts - No direct tests

  • Used in export/import operations
  • Covered indirectly by Database.test.ts export/import tests
  • Recommendation: Add edge case tests (malformed data, etc.)

3. TraversalQuery.ts - Memory issues

  • Has TraversalQuery-paths.test.ts (11 tests)
  • Main TraversalQuery.test.ts crashes during coverage
  • Recommendation: Fix memory leak or split tests

Test Quality Analysis

✅ Strengths:

  1. Comprehensive CRUD testing - Database.test.ts covers all operations
  2. Edge case coverage - NodeQuery.test.ts has extensive edge case tests
  3. Integration testing - job-pipeline.test.ts validates real-world usage
  4. Transaction semantics - Transaction.test.ts covers commit/rollback/savepoints
  5. Merge operations - Database-merge.test.ts validates upsert behavior
  6. Concurrency - concurrency.test.ts covers WAL, retry, WriteQueue

⚠️ Gaps:

  1. Schema validation - No direct Schema.ts tests
  2. Serialization edge cases - No direct serialization.ts tests
  3. TraversalQuery memory - Cannot complete coverage run
  4. Browser adapter - No tests for browser compatibility (work in progress)

Recommendations

Immediate (Fix Memory Issues):

  1. Increase Jest heap size: NODE_OPTIONS=--max-old-space-size=4096 npm test
  2. Split TraversalQuery.test.ts into smaller files
  3. Add --maxWorkers=1 --workerIdleMemoryLimit=1GB to test script

Short Term (Fill Coverage Gaps):

  1. Add Schema.test.ts for direct schema validation testing
  2. Add serialization.test.ts for edge cases (circular refs, malformed JSON)
  3. Increase timeout for graph operations: testTimeout: 60000

Long Term (Coverage Infrastructure):

  1. Set up CI coverage reporting (Codecov, Coveralls)
  2. Add coverage badges to README
  3. Enforce coverage thresholds in CI pipeline
  4. Generate coverage reports that don't crash

Coverage Report Generation (Workaround)

Since full coverage crashes, use per-file coverage:

# Test individual files with coverage
npx jest tests/unit/Database.test.ts --coverage
npx jest tests/unit/NodeQuery.test.ts --coverage
npx jest tests/unit/concurrency.test.ts --coverage

# Skip memory-intensive tests
npx jest --coverage --testPathIgnorePatterns=TraversalQuery.test.ts

Summary

Test Status: ✅ 294 passing tests, ❌ 2 suites with memory crashes

Estimated Coverage: ~75-80% (cannot verify due to instrumentation memory issues)

Core Functionality: Well tested (Database, NodeQuery, Transaction, concurrency)

Gaps: Schema, serialization edge cases, TraversalQuery memory issues

Production Ready? No - Memory crashes on coverage runs indicate potential production memory issues under load

Next Steps:

  1. Fix memory issues in TraversalQuery tests
  2. Add Schema and serialization direct tests
  3. Increase Jest heap size for coverage runs
  4. Set up CI coverage reporting