MCP TODO Server

import { TodoResolver } from '@/todo/todo.resolver'; import { TodoService } from '@/todo/todo.service'; import { Test, TestingModule } from '@nestjs/testing'; describe('TodoResolver', () => { let resolver: TodoResolver; let service: TodoService; beforeEach(async () => { const module: TestingModule = await Test.createTestingModule({ providers: [ TodoResolver, { provide: TodoService, useValue: { create: jest .fn() .mockImplementation(dto => ({ id: 1, ...dto, completed: false })), findAll: jest.fn().mockReturnValue([]), findOne: jest .fn() .mockImplementation(id => ({ id, title: 'Test' })), update: jest.fn().mockImplementation((id, dto) => ({ id, ...dto })), remove: jest.fn().mockReturnValue(undefined), }, }, ], }).compile(); resolver = module.get<TodoResolver>(TodoResolver); service = module.get<TodoService>(TodoService); }); it('should be defined', () => { expect(resolver).toBeDefined(); }); describe('create', () => { it('should call service.create and return MCP formatted content', async () => { const dto = { title: 'New Todo' }; const result = await resolver.create(dto); expect(service.create).toHaveBeenCalledWith(dto); expect(result).toHaveProperty('content'); expect(result.content[0].type).toBe('text'); expect(result.content[0].text).toContain('New Todo'); }); }); describe('findAll', () => { it('should return all todos in MCP format', async () => { const result = await resolver.findAll(); expect(service.findAll).toHaveBeenCalled(); expect(result).toHaveProperty('content'); expect(result.content[0].text).toBe('[]'); }); }); describe('findOne', () => { it('should return a specific todo in MCP format', async () => { const result = await resolver.findOne({ id: 1 }); expect(service.findOne).toHaveBeenCalledWith(1); expect(result).toHaveProperty('content'); expect(JSON.parse(result.content[0].text)).toHaveProperty('id', 1); }); }); describe('update', () => { it('should update todo and return MCP format', async () => { const dto = { title: 'Updated', id: 1 }; const result = await resolver.update(dto); expect(service.update).toHaveBeenCalledWith(1, { title: 'Updated' }); expect(result).toHaveProperty('content'); expect(result.content[0].text).toContain('Updated'); }); }); describe('remove', () => { it('should delete todo and return confirmation message', async () => { const result = await resolver.remove({ id: 1 }); expect(service.remove).toHaveBeenCalledWith(1); expect(result).toHaveProperty('content'); expect(result.content[0].text).toContain('deleted TODO with ID 1'); }); }); });