使用Inversify与mocha和chai进行依赖注入的Typescript中的单元测试

import 'reflect-metadata';
import { Container } from 'inversify';
import { injectable, inject } from 'inversify';
import { expect } from 'chai';

// 定义接口
interface UserRepository {
    find(id: number): any;
}

// 实现接口
@injectable()
class UserRepositoryImpl implements UserRepository {
    find(id: number) {
        return { id, name: 'John Doe' };
    }
}

// 服务类
@injectable()
class UserService {
    constructor(@inject(UserRepository) private repo: UserRepository) {}

    getUser(id: number) {
        return this.repo.find(id);
    }
}

// 测试
describe('UserService', () => {
    let userService: UserService;
    let userRepositoryMock: UserRepository;

    beforeEach(() => {
        const container = new Container();
        userRepositoryMock = {
            find: (id: number) => ({ id, name: 'Mock User' })
        };
        container.bind<UserRepository>('UserRepository').toConstantValue(userRepositoryMock);
        container.bind<UserService>('UserService').to(UserService);

        userService = container.get<UserService>('UserService');
    });

    it('should return user from repository', () => {
        const user = userService.getUser(1);
        expect(user).to.have.property('name', 'Mock User');
    });
});