In Jest UT, Nest can't resolve dependencies of the RedisService (?). Please make sure that the argument Symbol(REDIS_CLIENT) at index [0] is available in the RootTestModule context.

I have written the simple UT in Jest and also used nestjs-redis module for redis operation when i run the UT i am getting following error, i tried to mock as fn() but getting same issue.

Nest can't resolve dependencies of the RedisService (?). Please make sure that the argument Symbol(REDIS_CLIENT) at index [0] is available in the RootTestModule context.

   Potential solutions:
   - If Symbol(REDIS_CLIENT) is a provider, is it part of the current RootTestModule?
   - If Symbol(REDIS_CLIENT) is exported from a separate @Module, is that module imported within RootTestModule?
     @Module({
       imports: [ /* the Module containing Symbol(REDIS_CLIENT) */ ]
     })

Below is the code

import { Test, TestingModule } from '@nestjs/testing';
import { CatsController } from './cats.controller';
import { CatsService } from './cats.service';
import { getModelToken } from '@nestjs/mongoose';
import { RedisService } from '../../shared/lib/redis/redis.service';
describe('CatsController', () => {
    let controller: CatsController;
    let service: CatsService;
    
  beforeEach(async () => {
    const app: TestingModule = await Test.createTestingModule({
      controllers: [CatsController],
      providers: [CatsService, RedisService, { provide: getModelToken('Cats'), useValue: { Symbol: jest.fn()} }],
    }).compile();

    controller = app.get<CatsController>(CatsController);
    service = app.get<CatsService>(CatsService);
  });

  it('should be defined', () => {
    expect(controller).toBeDefined();
    expect(service).toBeDefined();
  });

  const catsData = [{
      cat_name: "cat",
      cat_type: "type",
      cat_color: "black"
  }]
  describe('Cats List', () => {


    it('should return all cats', async() => {
        jest.spyOn(service, 'getAll').mockResolvedValue({data: catsData, success: true})
        const catsList = await controller.findAll()
      expect(catsList).toBe({data: catsData, success: true});
    });

    it('should throw error record not found', async() => {
        jest.spyOn(service, 'getAll').mockRejectedValue({message: 'Records not found'})
        try{
            await controller.findAll();
          }catch(e){
            expect(e.message).toBe('Records not found');
          }
      });

  });
});

[eharaj1]

Hey @rjpkuyper ,

Many thanks, you saved my days.

[rjpkuyper]

Your welcome!

Could you please close the issue.