random-lol/TEST_COVERAGE.md

Test Coverage Summary

This document provides an overview of all the tests created for the Random LOL application.

Test Files Created/Updated

1. App Component Tests (src/app/app.spec.ts)

• ✅ Component creation
• ✅ ImagePreloadService injection
• ✅ Champion randomizer component rendering
• ✅ Toolbar rendering

2. Champion Randomizer Component Tests (src/app/components/champion-randomizer.component.spec.ts)

• ✅ Component creation and initialization
• ✅ Lane management (enable/disable lanes)
• ✅ Champion assignment and rolling
• ✅ Reroll bank management
• ✅ Champion changing functionality
• ✅ Duplicate champion prevention
• ✅ Computed properties (hasChampions, activatedLanesArray, disabledLanesArray, canCopyDraft)
• ✅ Lane assignments with proper labels
• ✅ Copy draft to clipboard functionality
• ✅ Error handling for clipboard operations
• ✅ Retry load functionality
• ✅ Lane and role label mapping
• ✅ Shift key tracking for force rerolls

3. Control Header Component Tests (src/app/components/control-header/control-header.component.spec.ts)

• ✅ Component creation
• ✅ All input properties (isLoading, hasChampions, loadError, canCopyDraft, rerollBank, rerollBankMax)
• ✅ Output events (roll, retry, copyDraft)
• ✅ Reroll percentage calculation
• ✅ Template rendering (spinner, error messages)

4. Lane Card Component Tests (src/app/components/lane-card/lane-card.component.spec.ts)

• ✅ Component creation
• ✅ All input properties (lane, laneLabel, champion, canReRoll, isLoading, hasChampions, isShiftPressed, disabled)
• ✅ Output events (changeChampion, toggleDisableLane)
• ✅ Role label mapping
• ✅ Template rendering (champion name, image, lane label, role chips, disabled styling)

5. Champion Data Service Tests (src/app/services/champion-data.service.spec.ts)

• ✅ Service creation
• ✅ Loading champions from API
• ✅ HTTP to HTTPS URL conversion
• ✅ Position to lane mapping (TOP → top, JUNGLE → jungle, etc.)
• ✅ Champion organization by lane
• ✅ Preventing duplicate loads
• ✅ Loading state management
• ✅ HTTP error handling
• ✅ Invalid champion filtering (no icon, no positions)
• ✅ Alphabetical sorting
• ✅ Force reload functionality
• ✅ LocalStorage caching
• ✅ Cache loading and validation
• ✅ Cache expiration (24 hours)
• ✅ Cache clearing
• ✅ Invalid cache data handling

6. Image Preload Service Tests (src/app/services/image-preload.service.spec.ts)

• ✅ Service creation
• ✅ Cache clearing functionality
• ✅ Error handling during cache operations

7. Random Number Service Tests (src/app/services/random-number.spec.ts)

• ✅ Service creation
• ✅ Random number generation within range
• ✅ Edge case: max = 1
• ✅ Error handling: max <= 0
• ✅ Error handling: max > MAX_SAFE_INTEGER
• ✅ Randomness verification (multiple unique values)
• ✅ Large max value handling
• ✅ crypto.getRandomValues usage verification

8. Preload Link Directive Tests (src/app/directives/preload-link.directive.spec.ts)

• ✅ Directive creation
• ✅ Preload link addition to document head
• ✅ Fetchpriority attribute setting
• ✅ Duplicate link prevention

9. Image Cache Interceptor Tests (src/app/interceptors/image-cache.interceptor.spec.ts)

• ✅ Cache header addition for PNG images
• ✅ Cache header addition for JPG images
• ✅ Cache header addition for JPEG images
• ✅ Cache header addition for WebP images
• ✅ Cache header addition for GIF images
• ✅ Cache header addition for champion URLs
• ✅ Cache header addition for ddragon URLs
• ✅ No cache headers for non-image requests
• ✅ No cache headers for JSON requests
• ✅ Other request headers preservation

Test Statistics

Total Test Suites: 9

• App: 4 tests
• Champion Randomizer: 29 tests
• Control Header: 10 tests
• Lane Card: 11 tests
• Champion Data Service: 23 tests
• Image Preload Service: 3 tests
• Random Number: 8 tests
• Preload Link Directive: 4 tests
• Image Cache Interceptor: 10 tests

Total Tests: 102+

Coverage Areas

✅ Components (100%)

• App
• ChampionRandomizerComponent
• ControlHeaderComponent
• LaneCardComponent

✅ Services (100%)

• ChampionDataService
• ImagePreloadService
• RandomNumber

✅ Directives (100%)

• PreloadLinkDirective

✅ Interceptors (100%)

• imageCacheInterceptor

Key Testing Features

1. Comprehensive Input/Output Testing: All component inputs and outputs are tested
2. State Management Testing: Signal-based state management is thoroughly tested
3. HTTP Testing: Mock HTTP requests and responses
4. Error Handling: Tests cover error scenarios and edge cases
5. Caching: LocalStorage and Cache API interactions are tested
6. Browser API Mocking: Clipboard, crypto, and cache APIs are properly mocked
7. Protected Member Access: Tests access protected members using TypeScript bracket notation
8. Async Operations: Proper handling of async/await in tests

Running the Tests

To run all tests:

npm test

To run tests in headless mode (requires Chrome):

npm test -- --watch=false --browsers=ChromeHeadless

To run tests with coverage:

ng test --no-watch --code-coverage

Notes

• All tests follow Angular testing best practices
• Tests use Jasmine framework
• HTTP testing uses HttpClientTestingModule
• Component testing uses TestBed and ComponentFixture
• Service testing includes proper mocking and spies
• Tests are isolated and don't depend on external services