好吧，终于经过测试并尝试了各种想法之后，我发现这是一个有效的策略
假设我们已经建立了一个PhotoEntity具有基本属性，没有什么特别的东西（id，名称，描述等）
import { Column, Entity, PrimaryGeneratedColumn } from 'typeorm';
@Entity()
export class Photo {
@PrimaryGeneratedColumn()
id: number;
@Column({ length: 500 })
name: string;
@Column('text')
description: string;
@Column()
filename: string;
@Column('int')
views: number;
@Column()
isPublished: boolean;
}
设置PhotoService如下所示的内容（超级基础，但这将说明要点）：
import { Injectable } from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { Repository } from 'typeorm';
import { Photo } from './photo.entity';
@Injectable()
export class PhotoService {
constructor(
@InjectRepository(Photo)
private readonly photoRepository: Repository,
) {}
async findAll(): Promise {
return await this.photoRepository.find();
}
}
我们可以useClass: Repository这样，我们不必做任何繁重的工作来设置用于测试的存储库类（存储库是从TypeORM包中导入的。然后，我们可以从模块中获取存储库并将其保存为一个值为了轻松模拟并像这样设置我们的测试：
import { Test, TestingModule } from '@nestjs/testing';
import { PhotoService } from './photo.service';
import { getRepositoryToken } from '@nestjs/typeorm';
import { Photo } from './photo.entity';
import { Repository } from 'typeorm';
describe('PhotoService', () => {
let service: PhotoService;
// declaring the repo variable for easy access later
let repo: Repository;
beforeEach(async () => {
const module: TestingModule = await Test.createTestingModule({
providers: [
PhotoService,
{
// how you provide the injection token in a test instance
provide: getRepositoryToken(Photo),
// as a class value, Repository needs no generics
useClass: Repository,
},
],
}).compile();
service = module.get(PhotoService);
// Save the instance of the repository and set the correct generics
repo = module.get>(getRepositoryToken(Photo));
});
it('should be defined', () => {
expect(service).toBeDefined();
});
it('should return for findAll', async () => {
// mock file for reuse
const testPhoto: Photo = {
id: 'a47ecdc2-77d6-462f-9045-c440c5e4616f',
name: 'hello',
description: 'the description',
isPublished: true,
filename: 'testFile.png',
views: 5,
};
// notice we are pulling the repo variable and using jest.spyOn with no issues
jest.spyOn(repo, 'find').mockResolvedValueOnce([testPhoto]);
expect(await service.findAll()).toEqual([testPhoto]);
});
});
针对指定文件或所有测试运行测试
? npm run test -- photo.service
> nestjs-playground@0.0.1 test ~/Documents/code/nestjs-playground
> jest "photo.service"
PASS src/photo/photo.service.spec.ts
PhotoService
? should be defined (17ms)
? should return for findAll (4ms) <-- test passes with no problem
Test Suites: 1 passed, 1 total
Tests: 2 passed, 2 total
Snapshots: 0 total
Time: 3.372s, estimated 4s
Ran all test suites matching /photo.service/i.
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