Initial commit: The Ultimate Antigravity Skills Collection (58 Skills)

skills/backend-dev-guidelines/resources/testing-guide.md

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+# Testing Guide - Backend Testing Strategies
+
+Complete guide to testing backend services with Jest and best practices.
+
+## Table of Contents
+
+- [Unit Testing](#unit-testing)
+- [Integration Testing](#integration-testing)
+- [Mocking Strategies](#mocking-strategies)
+- [Test Data Management](#test-data-management)
+- [Testing Authenticated Routes](#testing-authenticated-routes)
+- [Coverage Targets](#coverage-targets)
+
+---
+
+## Unit Testing
+
+### Test Structure
+
+```typescript
+// services/userService.test.ts
+import { UserService } from './userService';
+import { UserRepository } from '../repositories/UserRepository';
+
+jest.mock('../repositories/UserRepository');
+
+describe('UserService', () => {
+    let service: UserService;
+    let mockRepository: jest.Mocked<UserRepository>;
+
+    beforeEach(() => {
+        mockRepository = {
+            findByEmail: jest.fn(),
+            create: jest.fn(),
+        } as any;
+
+        service = new UserService();
+        (service as any).userRepository = mockRepository;
+    });
+
+    afterEach(() => {
+        jest.clearAllMocks();
+    });
+
+    describe('create', () => {
+        it('should throw error if email exists', async () => {
+            mockRepository.findByEmail.mockResolvedValue({ id: '123' } as any);
+
+            await expect(
+                service.create({ email: 'test@test.com' })
+            ).rejects.toThrow('Email already in use');
+        });
+
+        it('should create user if email is unique', async () => {
+            mockRepository.findByEmail.mockResolvedValue(null);
+            mockRepository.create.mockResolvedValue({ id: '123' } as any);
+
+            const user = await service.create({
+                email: 'test@test.com',
+                firstName: 'John',
+                lastName: 'Doe',
+            });
+
+            expect(user).toBeDefined();
+            expect(mockRepository.create).toHaveBeenCalledWith(
+                expect.objectContaining({
+                    email: 'test@test.com'
+                })
+            );
+        });
+    });
+});
+```
+
+---
+
+## Integration Testing
+
+### Test with Real Database
+
+```typescript
+import { PrismaService } from '@project-lifecycle-portal/database';
+
+describe('UserService Integration', () => {
+    let testUser: any;
+
+    beforeAll(async () => {
+        // Create test data
+        testUser = await PrismaService.main.user.create({
+            data: {
+                email: 'test@test.com',
+                profile: { create: { firstName: 'Test', lastName: 'User' } },
+            },
+        });
+    });
+
+    afterAll(async () => {
+        // Cleanup
+        await PrismaService.main.user.delete({ where: { id: testUser.id } });
+    });
+
+    it('should find user by email', async () => {
+        const user = await userService.findByEmail('test@test.com');
+        expect(user).toBeDefined();
+        expect(user?.email).toBe('test@test.com');
+    });
+});
+```
+
+---
+
+## Mocking Strategies
+
+### Mock PrismaService
+
+```typescript
+jest.mock('@project-lifecycle-portal/database', () => ({
+    PrismaService: {
+        main: {
+            user: {
+                findMany: jest.fn(),
+                findUnique: jest.fn(),
+                create: jest.fn(),
+                update: jest.fn(),
+            },
+        },
+        isAvailable: true,
+    },
+}));
+```
+
+### Mock Services
+
+```typescript
+const mockUserService = {
+    findById: jest.fn(),
+    create: jest.fn(),
+    update: jest.fn(),
+} as jest.Mocked<UserService>;
+```
+
+---
+
+## Test Data Management
+
+### Setup and Teardown
+
+```typescript
+describe('PermissionService', () => {
+    let instanceId: number;
+
+    beforeAll(async () => {
+        // Create test post
+        const post = await PrismaService.main.post.create({
+            data: { title: 'Test Post', content: 'Test', authorId: 'test-user' },
+        });
+        instanceId = post.id;
+    });
+
+    afterAll(async () => {
+        // Cleanup
+        await PrismaService.main.post.delete({
+            where: { id: instanceId },
+        });
+    });
+
+    beforeEach(() => {
+        // Clear caches
+        permissionService.clearCache();
+    });
+
+    it('should check permissions', async () => {
+        const hasPermission = await permissionService.checkPermission(
+            'user-id',
+            instanceId,
+            'VIEW_WORKFLOW'
+        );
+        expect(hasPermission).toBeDefined();
+    });
+});
+```
+
+---
+
+## Testing Authenticated Routes
+
+### Using test-auth-route.js
+
+```bash
+# Test authenticated endpoint
+node scripts/test-auth-route.js http://localhost:3002/form/api/users
+
+# Test with POST data
+node scripts/test-auth-route.js http://localhost:3002/form/api/users POST '{"email":"test@test.com"}'
+```
+
+### Mock Authentication in Tests
+
+```typescript
+// Mock auth middleware
+jest.mock('../middleware/SSOMiddleware', () => ({
+    SSOMiddlewareClient: {
+        verifyLoginStatus: (req, res, next) => {
+            res.locals.claims = {
+                sub: 'test-user-id',
+                preferred_username: 'testuser',
+            };
+            next();
+        },
+    },
+}));
+```
+
+---
+
+## Coverage Targets
+
+### Recommended Coverage
+
+- **Unit Tests**: 70%+ coverage
+- **Integration Tests**: Critical paths covered
+- **E2E Tests**: Happy paths covered
+
+### Run Coverage
+
+```bash
+npm test -- --coverage
+```
+
+---
+
+**Related Files:**
+- [SKILL.md](SKILL.md)
+- [services-and-repositories.md](services-and-repositories.md)
+- [complete-examples.md](complete-examples.md)