Gen Test

Generate tests for the specified file or component. Follow these project conventions exactly:

Test File Location

• Place tests in a __tests__/ folder next to the source file
• Name: ComponentName.test.tsx for components, route.test.ts for API routes

API Route Tests

import { describe, it, expect, vi, beforeEach } from 'vitest';

// Mock auth and DB at top level
vi.mock('next-auth/next', () => ({ getServerSession: vi.fn() }));
vi.mock('@/lib/auth', () => ({ authOptions: {} }));
vi.mock('@/lib/mongodb-adapter', () => ({ default: Promise.resolve({}) }));

// Create mock functions for DB operations
const findMock = vi.fn();
const insertOneMock = vi.fn();
// ... other operations as needed

vi.mock('@/lib/mongodb', () => ({
  getMongoClient: vi.fn(async () => ({
    db: () => ({
      collection: (name: string) => {
        // Return appropriate mocks per collection
        return { find: findMock, insertOne: insertOneMock };
      },
    }),
  })),
}));

// Import AFTER mocks
const { getServerSession } = await import('next-auth/next');
const routes = await import('../route');

// Helper for creating mock requests
const makeReq = (url: string, body?: unknown) => ({ url, json: async () => body }) as any;

beforeEach(() => {
  vi.restoreAllMocks();
  (getServerSession as any).mockReset();
  // Reset all DB mocks
});

Always test: auth (401 for no session), validation (400 for bad input), success path, error handling.

Component Tests

import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import { render, screen, cleanup, waitFor } from '@testing-library/react';
import userEvent from '@testing-library/user-event';

// Mock next-auth/react
const mockUseSession = vi.fn();
vi.mock('next-auth/react', () => ({
  useSession: () => mockUseSession(),
  SessionProvider: ({ children }: { children: React.ReactNode }) => children,
}));

// Mock next/navigation
const mockPush = vi.fn();
vi.mock('next/navigation', () => ({
  useRouter: () => ({ push: mockPush }),
  usePathname: () => '/current-path',
}));

afterEach(() => cleanup());

Always use: userEvent.setup() (not fireEvent), waitFor() for async, screen.getByRole/getByLabelText for queries.

Rules

• Use vi.mock at top level, import mocked modules AFTER with await import()
• Test auth states: logged in, logged out, admin vs regular user
• Test error states and edge cases
• Use error constants from @/lib/errors in assertions
• Run npm test after generating to verify tests pass

Source: zwrose/weekly-eats — distributed by TomeVault.