test: add Vitest infrastructure (config, setup, mocks, fixtures)

Adds test harness for the suite:
- vitest.config.ts: happy-dom env, @/* alias, v8 coverage with 70% thresholds
- setup.ts: env vars, global next/headers and next/navigation mocks
- tsconfig.json: IDE alias resolution for test/
- __mocks__/prisma.ts: centralised Prisma mock auto-registered via vi.mock
- fixtures/users.ts, fixtures/orders.ts: typed test data

test/__mocks__/prisma.ts

@@ -0,0 +1,81 @@
+import { vi } from 'vitest'
+
+export const prisma = {
+  user: {
+    findUnique: vi.fn(),
+    findMany: vi.fn(),
+    create: vi.fn(),
+    update: vi.fn(),
+    delete: vi.fn(),
+    count: vi.fn(),
+  },
+  session: {
+    create: vi.fn(),
+    findUnique: vi.fn(),
+    delete: vi.fn(),
+    deleteMany: vi.fn(),
+  },
+  loginAttempt: {
+    count: vi.fn(),
+    create: vi.fn(),
+    deleteMany: vi.fn(),
+  },
+  order: {
+    create: vi.fn(),
+    update: vi.fn(),
+    findUnique: vi.fn(),
+    findMany: vi.fn(),
+    count: vi.fn(),
+  },
+  orderItem: {
+    create: vi.fn(),
+    findMany: vi.fn(),
+  },
+  payment: {
+    create: vi.fn(),
+    update: vi.fn(),
+    updateMany: vi.fn(),
+    findFirst: vi.fn(),
+    findMany: vi.fn(),
+  },
+  product: {
+    findUnique: vi.fn(),
+    findMany: vi.fn(),
+    create: vi.fn(),
+    update: vi.fn(),
+    delete: vi.fn(),
+    count: vi.fn(),
+  },
+  productType: {
+    findUnique: vi.fn(),
+    findMany: vi.fn(),
+    create: vi.fn(),
+    update: vi.fn(),
+    delete: vi.fn(),
+  },
+  category: {
+    findUnique: vi.fn(),
+    findMany: vi.fn(),
+    create: vi.fn(),
+    update: vi.fn(),
+    delete: vi.fn(),
+  },
+  review: {
+    findMany: vi.fn(),
+    create: vi.fn(),
+    update: vi.fn(),
+    delete: vi.fn(),
+    count: vi.fn(),
+  },
+  auditLog: {
+    create: vi.fn(),
+    findMany: vi.fn(),
+  },
+  siteSettings: {
+    findMany: vi.fn(),
+    upsert: vi.fn(),
+  },
+  $transaction: vi.fn((fn: (tx: unknown) => unknown) => fn(prisma)),
+}
+
+vi.mock('@/lib/prisma', () => ({ prisma }))

test/fixtures/orders.ts

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+import { mockUser } from './users'
+
+export const mockOrder = {
+  id: 'order-1',
+  userId: mockUser.id,
+  status: 'PENDING' as const,
+  grandTotal: 2999,
+  currency: 'EUR',
+  createdAt: new Date('2024-01-01'),
+  updatedAt: new Date('2024-01-01'),
+  user: mockUser,
+}
+
+export const mockPayment = {
+  id: 'payment-1',
+  orderId: mockOrder.id,
+  provider: 'stripe',
+  providerPaymentId: 'pi_test_123',
+  status: 'pending',
+  amount: 2999,
+  currency: 'EUR',
+  rawPayload: {},
+  createdAt: new Date('2024-01-01'),
+  updatedAt: new Date('2024-01-01'),
+}
+
+export const mockStripeCheckoutEvent = {
+  type: 'checkout.session.completed',
+  data: {
+    object: {
+      metadata: { orderId: mockOrder.id },
+      payment_intent: 'pi_test_123',
+    },
+  },
+}
+
+export const mockStripePaymentSucceededEvent = {
+  type: 'payment_intent.succeeded',
+  data: {
+    object: {
+      id: 'pi_test_123',
+    },
+  },
+}
+
+export const mockStripePaymentFailedEvent = {
+  type: 'payment_intent.payment_failed',
+  data: {
+    object: {
+      id: 'pi_test_123',
+    },
+  },
+}

test/fixtures/users.ts

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+export const mockUser = {
+  id: 'user-1',
+  email: 'test@example.com',
+  name: 'Test User',
+  passwordHash: '$2a$12$hashedpassword',
+  role: 'CUSTOMER' as const,
+  mustChangePassword: false,
+  createdAt: new Date('2024-01-01'),
+  updatedAt: new Date('2024-01-01'),
+}
+
+export const mockAdmin = {
+  ...mockUser,
+  id: 'admin-1',
+  email: 'admin@example.com',
+  name: 'Admin User',
+  role: 'ADMIN' as const,
+}
+
+export const mockSession = {
+  id: 'session-1',
+  userId: mockUser.id,
+  tokenHash: 'abc123hash',
+  expiresAt: new Date(Date.now() + 30 * 24 * 60 * 60 * 1000),
+  createdAt: new Date('2024-01-01'),
+  user: mockUser,
+}

test/setup.ts

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+import '@testing-library/jest-dom'
+import { vi } from 'vitest'
+
+// Env vars necessarie per i test
+process.env.STRIPE_SECRET_KEY = 'sk_test_mock'
+process.env.STRIPE_WEBHOOK_SECRET = 'whsec_test_mock'
+process.env.SMTP_HOST = 'localhost'
+process.env.SMTP_PORT = '1025'
+process.env.APP_URL = 'http://localhost'
+process.env.DATABASE_URL = 'postgresql://test:test@localhost:5432/test'
+process.env.NODE_ENV = 'test'
+process.env.AUTH_SECRET = 'test-secret-32-chars-minimum-ok!'
+
+// Mock di next/headers (cookies() lancia fuori dal runtime Next.js)
+vi.mock('next/headers', () => {
+  const mockCookieStore = {
+    get: vi.fn(),
+    set: vi.fn(),
+    delete: vi.fn(),
+  }
+  return {
+    cookies: vi.fn(() => mockCookieStore),
+  }
+})
+
+// Mock di next/navigation
+vi.mock('next/navigation', () => ({
+  useRouter: vi.fn(() => ({ push: vi.fn(), replace: vi.fn() })),
+  usePathname: vi.fn(() => '/'),
+  redirect: vi.fn(),
+}))

test/tsconfig.json

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+{
+  "extends": "../app/tsconfig.json",
+  "compilerOptions": {
+    "baseUrl": ".",
+    "paths": {
+      "@/*": ["../app/src/*"]
+    },
+    "types": ["vitest/globals", "@testing-library/jest-dom"]
+  },
+  "include": [
+    "./**/*.ts",
+    "./**/*.tsx"
+  ],
+  "exclude": ["node_modules"]
+}

test/vitest.config.ts

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+import { defineConfig } from 'vitest/config'
+import path from 'path'
+
+export default defineConfig({
+  test: {
+    environment: 'happy-dom',
+    globals: true,
+    setupFiles: [path.resolve(__dirname, 'setup.ts')],
+    include: [
+      '../test/unit/**/*.{test,spec}.{ts,tsx}',
+      '../test/integration/**/*.{test,spec}.{ts,tsx}',
+      '../test/components/**/*.{test,spec}.{ts,tsx}',
+    ],
+    exclude: ['**/node_modules/**'],
+    coverage: {
+      provider: 'v8',
+      reporter: ['text', 'html', 'lcov'],
+      include: ['src/**/*.ts', 'src/**/*.tsx'],
+      exclude: [
+        'src/app/layout.tsx',
+        'src/lib/prisma.ts',
+        'src/**/*.d.ts',
+      ],
+      thresholds: { lines: 70, functions: 70 },
+    },
+  },
+  resolve: {
+    alias: {
+      '@': path.resolve(__dirname, '../app/src'),
+    },
+  },
+  esbuild: {
+    jsx: 'automatic',
+    jsxImportSource: 'react',
+  },
+})