Feature/comprehensive testing

.changeset/notificationkit_71368.md

@@ -4,10 +4,36 @@
 
 ## Summary
 
-First official release: Added Dependabot automation and SonarQube MCP integration instructions
+Comprehensive testing implementation with 133+ tests, improved code quality, and complete documentation.
 
 ## Changes
 
+### Testing
+
+- Added comprehensive test suite with 133+ tests across 10 test suites
+- Created shared test utilities in `test/test-utils.ts` to reduce code duplication
+- Implemented integration tests for end-to-end notification workflows
+- Added controller tests for REST API endpoints
+- Added module tests for NestJS dependency injection
+- Included mock implementations: `MockRepository`, `MockSender`, `MockTemplateEngine`, etc.
+- Created helper functions for easier test setup: `createNotificationServiceWithDeps()`, `createFailingNotificationServiceWithDeps()`
+
+### Code Quality
+
+- Reduced code duplication from 4.3% to 2.66% (passing SonarQube quality gate ≤ 3%)
+- Improved code organization with centralized test utilities
+- Fixed ESLint and TypeScript strict mode issues in test files
+
+### Documentation
+
+- Created comprehensive README.md with full project documentation
+- Updated CONTRIBUTING.md with detailed testing guidelines
+- Added CHANGELOG.md to track version history
+- Enhanced infrastructure documentation with testing examples
+- Added support and contribution links
+
+### Automation
+
 - Updated package configuration and workflows
-- Enhanced code quality and automation tooling
-- Improved CI/CD integration and monitoring capabilities
+- Enhanced CI/CD integration with Dependabot
+- Integrated SonarQube quality gate checks

.github/instructions/testing.instructions.md

@@ -347,3 +347,195 @@ it("test", async () => {
 - [ ] Mocks cleaned up in afterEach
 - [ ] Async operations properly awaited
 - [ ] Error cases tested
+
+---
+
+## 🧰 Shared Test Utilities
+
+This package provides shared test utilities in `test/test-utils.ts` to reduce code duplication and make testing easier.
+
+### Mock Implementations
+
+```typescript
+import {
+  MockRepository,
+  MockSender,
+  MockTemplateEngine,
+  MockEventEmitter,
+  MockFailingSender,
+} from "../test/test-utils";
+
+// In-memory notification repository
+const repository = new MockRepository();
+await repository.create(notification);
+
+// Mock notification sender (always succeeds)
+const sender = new MockSender(NotificationChannel.EMAIL);
+await sender.send(recipient, content);
+
+// Mock sender that simulates failures
+const failingSender = new MockFailingSender();
+failingSender.setShouldFail(true);
+
+// Mock template engine
+const templateEngine = new MockTemplateEngine();
+await templateEngine.render("welcome", { name: "John" });
+
+// Mock event emitter
+const eventEmitter = new MockEventEmitter();
+eventEmitter.on("notification.sent", handler);
+```
+
+### Factory Functions
+
+```typescript
+import {
+  createNotificationServiceWithDeps,
+  createFailingNotificationServiceWithDeps,
+  createModuleTestOptions,
+} from "../test/test-utils";
+
+// Create service with all mocked dependencies
+const { service, repository, sender, idGenerator, dateTimeProvider } =
+  createNotificationServiceWithDeps();
+
+// Create service with failing sender for error testing
+const { service: failingService, repository: failingRepo } =
+  createFailingNotificationServiceWithDeps();
+
+// Create module configuration for NestJS testing
+const options = createModuleTestOptions({
+  senders: [new MockSender()],
+  repository: new MockRepository(),
+});
+```
+
+### Default Test Data
+
+```typescript
+import { defaultNotificationDto, createMockNotification } from "../test/test-utils";
+
+// Standard notification DTO for tests
+const notification = await service.send(defaultNotificationDto);
+
+// Create mock notification with custom overrides
+const mockNotification = createMockNotification({
+  status: NotificationStatus.SENT,
+  priority: NotificationPriority.HIGH,
+});
+```
+
+### Usage Example
+
+```typescript
+import { createNotificationServiceWithDeps, defaultNotificationDto } from "../test/test-utils";
+
+describe("MyFeature", () => {
+  let service: NotificationService;
+  let repository: MockRepository;
+
+  beforeEach(() => {
+    const ctx = createNotificationServiceWithDeps();
+    service = ctx.service;
+    repository = ctx.repository;
+  });
+
+  it("should create notification", async () => {
+    const notification = await service.create(defaultNotificationDto);
+
+    expect(notification.id).toBeDefined();
+    expect(notification.status).toBe(NotificationStatus.QUEUED);
+  });
+
+  it("should send notification", async () => {
+    const result = await service.send(defaultNotificationDto);
+
+    expect(result.success).toBe(true);
+
+    // Repository is shared, can verify persistence
+    const notifications = await repository.find({});
+    expect(notifications).toHaveLength(1);
+  });
+});
+```
+
+### Benefits
+
+- ✅ **Reduced duplication**: Centralized mock implementations
+- ✅ **Consistent behavior**: All tests use the same mocks
+- ✅ **Easy setup**: Factory functions handle complex initialization
+- ✅ **Type safety**: Full TypeScript support
+- ✅ **Maintainable**: Changes to mocks update all tests automatically
+
+---
+
+## 📈 Current Test Coverage
+
+The package maintains comprehensive test coverage:
+
+- **Total Tests**: 133+
+- **Test Suites**: 10
+- **Code Duplication**: 2.66% (well below 3% threshold)
+- **Coverage Target**: 80%+ (achieved)
+
+### Test Distribution
+
+- ✅ Core domain tests (notification.service.test.ts)
+- ✅ DTO validation tests (dtos.test.ts)
+- ✅ Error handling tests (errors.test.ts)
+- ✅ Provider tests (providers.test.ts)
+- ✅ Controller tests (notification.controller.test.ts, webhook.controller.test.ts)
+- ✅ Module tests (module.test.ts)
+- ✅ Decorator tests (decorators.test.ts)
+- ✅ Integration tests (integration.test.ts)
+- ✅ Smoke tests (smoke.test.ts)
+
+---
+
+## 🚀 Running Tests
+
+```bash
+# Run all tests
+npm test
+
+# Run with coverage
+npm run test:cov
+
+# Watch mode for development
+npm run test:watch
+
+# Run specific test file
+npm test -- notification.service.test.ts
+
+# Run tests matching pattern
+npm test -- --testNamePattern="should send notification"
+```
+
+---
+
+## 📝 Writing New Tests
+
+When adding new tests:
+
+1. **Use shared utilities** from `test/test-utils.ts` to avoid duplication
+2. **Follow naming conventions**: `[feature].test.ts` or `[feature].spec.ts`
+3. **Test behavior**, not implementation details
+4. **Include error cases** and edge conditions
+5. **Keep tests independent** - no shared state between tests
+6. **Use descriptive names**: `it('should [expected behavior] when [condition]')`
+7. **Clean up mocks** in `afterEach()` hooks
+
+---
+
+## 🔍 Quality Checks
+
+Before committing:
+
+```bash
+npm run lint              # Check code style
+npm run typecheck         # Check TypeScript types
+npm test                  # Run all tests
+npm run test:cov          # Verify coverage
+```
+
+All checks must pass before merging to main branch.

CHANGELOG.md

@@ -0,0 +1,49 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+
+- Comprehensive test suite with 133+ tests across 10 test suites
+- Shared test utilities in `test/test-utils.ts` for easier testing
+- Integration tests for end-to-end notification workflows
+- Controller tests for REST API endpoints
+- Module tests for NestJS dependency injection
+- Mock implementations for testing: `MockRepository`, `MockSender`, `MockTemplateEngine`
+- Test helper functions: `createNotificationServiceWithDeps()`, `createFailingNotificationServiceWithDeps()`
+- Default test data: `defaultNotificationDto`
+
+### Changed
+
+- Reduced code duplication from 4.3% to 2.66% (passing SonarQube quality gate)
+- Improved test organization with centralized test utilities
+- Enhanced documentation with comprehensive README and testing guidelines
+
+### Fixed
+
+- ESLint configuration for test files
+- TypeScript strict mode compatibility across all test files
+
+## [0.0.0] - Initial Release
+
+### Added
+
+- Core notification service with support for Email, SMS, and Push notifications
+- Multi-provider support (Twilio, AWS SNS, Firebase, Nodemailer, etc.)
+- NestJS module integration with dependency injection
+- Pluggable repository pattern for flexible data storage
+- Event system for notification lifecycle tracking
+- Template engine support (Handlebars and simple templates)
+- Retry logic and notification state management
+- REST API controllers (optional)
+- Webhook handling (optional)
+- Clean architecture with framework-agnostic core
+- Full TypeScript support with type definitions
+
+[Unreleased]: https://github.com/CISCODE-MA/NotificationKit/compare/v0.0.0...HEAD
+[0.0.0]: https://github.com/CISCODE-MA/NotificationKit/releases/tag/v0.0.0

CONTRIBUTING.md

@@ -1,6 +1,6 @@
-# Contributing to <PACKAGE_NAME>
+# Contributing to @ciscode/notification-kit
 
-Thank you for your interest in contributing to **<PACKAGE_NAME>** 💙  
+Thank you for your interest in contributing to **@ciscode/notification-kit** 💙  
 Contributions of all kinds are welcome: bug fixes, improvements, documentation, and discussions.
 
 ---
@@ -67,10 +67,49 @@ npm test
 npm run build
 ```
 
-If you add or modify logic:
+### Testing Guidelines
 
-• Add unit tests for behaviour changes.
-• Avoid live external API calls in tests.
+This project maintains high test coverage (133+ tests). When contributing:
+
+**For bug fixes:**
+
+- Add a test that reproduces the bug
+- Verify the fix resolves the issue
+- Ensure existing tests still pass
+
+**For new features:**
+
+- Add unit tests for core business logic
+- Add integration tests for end-to-end workflows
+- Test error cases and edge cases
+- Use shared test utilities from `test/test-utils.ts`
+
+**Testing best practices:**
+
+- Keep tests independent and isolated
+- Use descriptive test names: `it('should [expected behavior]')`
+- Avoid live external API calls - use mocks
+- Test both success and failure scenarios
+- Aim for at least 80% code coverage
+
+**Available test utilities:**
+
+```typescript
+import {
+  createNotificationServiceWithDeps,
+  MockRepository,
+  MockSender,
+  defaultNotificationDto,
+} from "./test/test-utils";
+```
+
+**Running specific test suites:**
+
+```bash
+npm test -- notification.service.test.ts  # Run specific file
+npm run test:watch                         # Watch mode
+npm run test:cov                           # With coverage
+```
 
 ---
 
@@ -81,7 +120,8 @@ When opening a PR:
 • Clearly describe what was changed and why
 • Keep PRs focused on a single concern
 • Reference related issues if applicable
-• Update docummentation if APIs or behaviour change
+• Update documentation if APIs or behaviour change
+• Ensure all tests pass and coverage is maintained
 
 A maintainer may ask for changes or clarification before merging.