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i45 v3.0.0-alpha.1 - Testing Implementation Summary

Date: December 19, 2025
Phase: Phase 2 - Testing (IN PROGRESS)

Overview

Comprehensive test suite has been implemented for the i45 library using Jest and TypeScript. The test infrastructure is now in place with good coverage of core functionality.

Test Statistics

Overall Results

  • Total Tests: 205
  • Passing: 205 (100%)
  • Failing: 0 (0%)
  • Test Suites: 6 (all passing)

Recent Updates (v3.0.1 - December 22, 2025)

  • Added 32 comprehensive tests for IndexedDBService
  • Added fake-indexeddb for IndexedDB testing in Node.js environment
  • Added structuredClone polyfill for test compatibility
  • Fixed empty string handling in IndexedDBService retrieval
  • All 205 tests now passing

Code Coverage

  • Overall Coverage: 63.82%
  • Statements: 63.82%
  • Branches: 50.27%
  • Functions: 78.12%
  • Lines: 63.97%

Coverage by Module

Module Statements Branches Functions Lines Status
Storage Services 92.45% 61.29% 100% 92.45% ✅ Excellent
Models 100% 100% 100% 100% ✅ Perfect
DataContext 60.67% 49.65% 81.39% 60.4% 🟡 Good
Exceptions 25% 0% 0% 27.77% ❌ Needs Work

Test Infrastructure

Configuration Files

  1. jest.config.js - Jest configuration with TypeScript support

    • ts-jest preset for TypeScript transformation
    • jsdom environment for browser APIs
    • ESM module support
    • Coverage thresholds (80% target)
    • Manual mocks for dependencies

  2. tests/setup.ts - Global test setup

    • Mock implementations of localStorage and sessionStorage
    • BeforeEach hooks to clear storage
    • Custom Jest matchers

  3. tests/mocks/ - Manual mocks for external dependencies

    • i45-jslogger.ts - Mock Logger class
    • i45-sample-data.ts - Mock SampleData class

Test Utilities (tests/test-utils.ts)

  • createMockStorageItems() - Generate test storage items
  • createTestData<T>() - Generic test data factory
  • MockLogger - Test logger implementation
  • expectToThrow() - Async error assertion helper

Test Suites

1. LocalStorageService Tests ✅

File: tests/localStorageService.test.ts
Status: All Passing (12/12)
Coverage: 100% statements, 90% branches

Test Categories:

  • save() - 5 tests
  • retrieve() - 3 tests
  • remove() - 2 tests
  • clear() - 1 test
  • Integration - 1 test

2. SessionStorageService Tests ✅

File: tests/sessionStorageService.test.ts
Status: All Passing (11/11)
Coverage: 94.73% statements, 80% branches

Test Categories:

  • save() - 3 tests
  • retrieve() - 3 tests
  • remove() - 2 tests
  • clear() - 2 tests
  • Storage Isolation - 1 test

3. Models Tests ✅

File: tests/models.test.ts
Status: All Passing (34/34)
Coverage: 100% complete

Test Categories:

  • StorageLocations enum - 9 tests (includes IndexedDB)
  • StorageItem interface - 18 tests
  • createStorageItem() function - 5 tests
  • Model Integration - 3 tests

4. IndexedDBService Tests ✅

File: tests/indexedDBService.test.ts
Status: All Passing (32/32)
Coverage: 89.61% statements, 91.3% branches

Test Categories:

  • Availability - 1 test
  • save() - 7 tests (including empty strings, unicode, large values)
  • retrieve() - 4 tests (saved items, non-existent keys, JSON strings)
  • remove() - 4 tests (item removal, error handling)
  • clear() - 2 tests (clearing items, empty database)
  • close() - 3 tests (connection management)
  • Integration - 3 tests (lifecycle, persistence across instances)
  • Edge Cases - 4 tests (special characters, concurrent operations)
  • Storage Isolation - 3 tests (localStorage/sessionStorage isolation)
  • Error Handling - 2 tests (operations after clear/remove)

Testing Infrastructure:

  • Uses fake-indexeddb for Node.js test environment
  • Custom structuredClone polyfill for older Node versions
  • Proper cleanup with afterEach hooks

4. DataContext Tests 🟡

File: tests/dataContext.test.ts
Status: 61/69 Passing (88.4%)
Coverage: 60.67% statements

Test Categories:

  • Constructor - 5/5 passing
  • Properties - 15/19 passing (4 validation tests expected to fail)
  • store() methods - 13/16 passing
  • retrieve() methods - 9/9 passing
  • remove() methods - 8/8 passing
  • clear() - 2/3 passing
  • Method chaining - 2/2 passing
  • Logging integration - 1/2 passing
  • Edge cases - 4/4 passing
  • getCurrentSettings() - 2/2 passing

Expected Test Failures

The following 8 test failures are expected and document features that need to be implemented in Phase 2:

Validation Not Yet Implemented

  1. Empty storage key validation - DataContext should throw error for empty string keys
  2. Whitespace-only key validation - Should throw error for whitespace-only keys
  3. Non-array items validation - store() should throw error for non-array input
  4. Null items validation - store() should throw error for null input
  5. Invalid key validation - storeAs() should throw error for empty keys
  6. Invalid storage location - storeAt() should throw error for invalid locations

Behavior Differences

  1. Clear isolation - clear() currently clears both localStorage and sessionStorage
  2. Logging integration - Mock logger doesn't capture events properly

NPM Scripts

{
  "test": "jest",
  "test:watch": "jest --watch",
  "test:coverage": "jest --coverage",
  "test:verbose": "jest --verbose",
  "test:ci": "jest --ci --coverage --maxWorkers=2"
}

Dependencies Installed

{
  "devDependencies": {
    "@jest/globals": "^29.x",
    "@types/jest": "^29.x",
    "jest": "^29.x",
    "jest-environment-jsdom": "^29.x",
    "ts-jest": "^29.x",
    "ts-node": "^10.x"
  }
}

Coverage Reports

Coverage reports are generated in the coverage/ directory:

  • coverage/index.html - Interactive HTML coverage report
  • coverage/lcov-report/ - Detailed line-by-line coverage
  • coverage/lcov.info - LCOV format for CI/CD tools
  • coverage/coverage-summary.json - JSON summary for automation

To view coverage:

npm run test:coverage
open coverage/index.html

Achievements

✅ Completed:

  1. Jest infrastructure fully configured
  2. TypeScript + ESM support working
  3. Browser API mocks (localStorage, sessionStorage)
  4. External dependency mocks (i45-jslogger, i45-sample-data)
  5. 118 comprehensive tests written
  6. 110 tests passing (93%)
  7. Coverage reporting enabled
  8. Storage services 92%+ coverage
  9. Models 100% coverage
  10. Test utilities and helpers created

Next Steps (Phase 2 Continuation)

Immediate (v3.0.0-alpha.2)

  1. Add Input Validation (Priority: HIGH)

    • Implement validation for empty/whitespace keys
    • Add type checking for array inputs
    • Validate storage location values
    • Add proper error throwing

  2. Fix clear() Behavior

    • Make clear() respect current storage location
    • Add tests for storage isolation

  3. Improve DataContext Coverage (Target: >80%)

    • Test error paths
    • Test edge cases
    • Test all code branches

  4. Test Exception Classes

    • Currently at 25% coverage
    • Add tests for all custom error types

Future (v3.0.0-beta.1)

  1. Integration Tests

    • End-to-end workflows
    • Cross-storage operations
    • Real browser testing

  2. Performance Tests

    • Large dataset handling
    • Memory usage
    • Storage quota limits

  3. Browser Compatibility Tests

    • Playwright/Puppeteer setup
    • Test in multiple browsers
    • Test storage limitations

CI/CD Recommendations

# .github/workflows/test.yml
name: Tests
on: [push, pull_request]
jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version: "20"
      - run: npm install
      - run: npm run test:ci
      - uses: codecov/codecov-action@v3
        with:
          files: ./coverage/lcov.info

Documentation

All tests are fully documented with:

  • Clear test descriptions
  • Arrange-Act-Assert pattern
  • Edge case coverage
  • Type safety verification

Example:

describe("DataContext", () => {
  describe("store()", () => {
    it("should store items with default settings", async () => {
      // Arrange
      const items = createMockStorageItems(3);

      // Act
      await context.store(items);

      // Assert
      const stored = localStorage.getItem("TestData");
      expect(stored).not.toBeNull();
      expect(JSON.parse(stored!)).toEqual(items);
    });
  });
});

Summary

Phase 2 Testing is 70% complete. The test infrastructure is solid, with excellent coverage of storage services and models. The DataContext has good coverage but needs validation implementation to reach the 80% threshold. The failing tests document exactly what needs to be added for v3.0.0-beta.1.

Current Quality:

  • ✅ Test infrastructure: Excellent
  • ✅ Service tests: Complete
  • ✅ Model tests: Complete
  • 🟡 DataContext tests: Good (needs validation)
  • ❌ Exception tests: Needs work

Ready for:

  • Alpha testing with known limitations
  • Code review and feedback
  • Incremental coverage improvements

Generated: December 19, 2025