Nest could not find GraphQLModule element

Question

I'm trying to write the e2e test for my backend app (nestjs, grpahql, mongodb). This is my test:

import { INestApplication } from '@nestjs/common';
import { GraphQLModule } from '@nestjs/graphql';
import { Test, TestingModule } from '@nestjs/testing';
import {
    ApolloServerTestClient,
    createTestClient,
} from 'apollo-server-testing';
import gql from 'graphql-tag';
import { UserModule } from '../src/user/user.module';
import { MongooseModule } from '@nestjs/mongoose';
import config from '../src/environments/environment';

describe('User', () => {
    let app: INestApplication;
    let apolloClient: ApolloServerTestClient;

    beforeEach(async () => {
    const moduleFixture: TestingModule = await Test.createTestingModule({
        imports: [UserModule, MongooseModule.forRoot(config.mongoURI)],
    }).compile();

    app = moduleFixture.createNestApplication();
    await app.init();

    const module: GraphQLModule = moduleFixture.get<GraphQLModule>(
        GraphQLModule,
    );
    apolloClient = createTestClient((module as any).apolloServer);
    });

    it('should get users', async () => {
    const { query } = apolloClient;
    const result: any = await query({
        query: gql`
        query {
            getUsers {
            _id
            name
            }
        }
        `,
        variables: {},
    });
    console.log(result);
    });
});

I face this error:

Nest could not find GraphQLModule element (this provider does not exist in the current context)

Could someone share a working example or point me what is wrong?

Answer 1

It looks like GraphQLModule is not imported in the scope of your TestModule. If so, the context will never be able to provide it using get().

Also, this might not help you but this is what we do in our projects:

  beforeAll(async () => {
    const TCP_PORT = 4242;
    const testingModule = await Test.createTestingModule({
      imports: [AppModule],
    }).compile();

    gqlClient = new ApolloClient({
      uri: `http://localhost:${TCP_PORT}/graphql`,
      fetch: fetch as any,
      cache: new InMemoryCache({
        addTypename: false,
      }),
    });

    app = testingModule.createNestApplication();
    await app.listen(TCP_PORT);
  });

I did not add all the imports but here are the most relevant:

import ApolloClient, { gql, InMemoryCache } from 'apollo-boost';
import fetch from 'node-fetch';

I assume you know the other ones and/or don't need them