Unit testing NestJS模拟返回守卫的Mixin

Unit testing NestJS模拟返回守卫的Mixin,unit-testing,dependency-injection,nestjs,Unit Testing,Dependency Injection,Nestjs,我希望能对我遇到的问题有所了解 我有一个可以产生守卫的混血儿。生成的保护使用注入的服务。以下是mixin的代码: import { CanActivate, ExecutionContext, Injectable, mixin, } from '@nestjs/common'; import { GqlExecutionContext } from '@nestjs/graphql'; import { AccountService } from 'src/modules/ac

我希望能对我遇到的问题有所了解

我有一个可以产生守卫的混血儿。生成的保护使用注入的服务。以下是mixin的代码:

import {
  CanActivate,
  ExecutionContext,
  Injectable,
  mixin,
} from '@nestjs/common';
import { GqlExecutionContext } from '@nestjs/graphql';
import { AccountService } from 'src/modules/account/account.service';

export const ForAccountGuard = (
  paramName: string,
  { required = false }: { required?: boolean } = {}
) => {
  @Injectable()
  class _ForAccountGuard implements CanActivate {
    constructor(private readonly accountService: AccountService) {}

    async canActivate(context: ExecutionContext) {
      const ctx = GqlExecutionContext.create(context);
      const accountId = ctx.getArgs()[paramName];
      const currentUser = ctx.getContext().user;

      if (required && !accountId) {
        return false;
      }

      if (accountId) {
        const account = await this.accountService.findUserAccount(
          accountId,
          currentUser.id
        );
        return !!account;
      }

      return true;
    }
  }

  return mixin(_ForAccountGuard);
};

在我对使用此mixin作为防护的解析器的测试中,我正在执行以下操作:

  @Query(() => [PropertyEntity])
  @UseGuards(ForAccountGuard('accountId'))
  async allProperties(@Args() { accountId }: AllPropertiesArgs) {
    // <implementation removed>
  }
看起来注入的AccountService没有被解析

我不太清楚如何告诉Nest的测试模块重写一个作为mixin的保护。我一直在这样尝试,但似乎不起作用:

  beforeEach(async () => {
    const module: TestingModule = await Test.createTestingModule({
      providers: [
        PropertyResolver,
        ...
      ],
    })
      .overrideGuard(ForAccountGuard)
      .useValue(createMock<typeof ForAccountGuard>())
      .compile();
    );
  });
beforeach(异步()=>{
常量模块:TestingModule=等待测试。createTestingModule({
供应商:[
房地产经纪人,
...
],
})
.超控守卫(用于AccountGuard)
.useValue(createMock())
.compile();
);
});

那么,我该如何模拟一个混搭的守卫呢?

好吧,在做了一点修补之后,我想出了一个解决方案

放弃
overrideGuard
方法,对整个mixin进行一次直接的
玩笑

因此,我创建了一个模拟:

import { CanActivate, Injectable, mixin } from '@nestjs/common';

export const mockForAccountGuard = () => {
  @Injectable()
  class _ForAccountGuardMock implements CanActivate {
    canActivate() {
      return true;
    }
  }

  return mixin(_ForAccountGuardMock);
};
然后我用
jest.mock
来模拟它:

// in my test file

import { mockForAccountGuard } from '../common/guards/__mocks__/for-account.guard';
import { ForAccountGuard } from '../common/guards/for-account.guard';

jest.mock('../common/guards/for-account.guard', () => ({
  ForAccountGuard: mockForAccountGuard,
}));

...

describe('PropertyResolver', () => {
  ...
  beforeEach(() => {
    ...
    const module: TestingModule = await Test.createTestingModule({
      ...
    }).compile() // note, not using overrideGuards here
  });
})

而这似乎起到了作用

您使用的是绝对导入还是相对导入?如果您使用的是absolute(导入从
src/
开始),那么您需要将适当的映射添加到
jest.config.js
文件中
// in my test file

import { mockForAccountGuard } from '../common/guards/__mocks__/for-account.guard';
import { ForAccountGuard } from '../common/guards/for-account.guard';

jest.mock('../common/guards/for-account.guard', () => ({
  ForAccountGuard: mockForAccountGuard,
}));

...

describe('PropertyResolver', () => {
  ...
  beforeEach(() => {
    ...
    const module: TestingModule = await Test.createTestingModule({
      ...
    }).compile() // note, not using overrideGuards here
  });
})