Chaining returnWith and toMatchObject

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• More than one test fails due to import after jest is torn down - Supertest Typescript and Express API

  I am running into an issue where I am running multiple tests using supertest and jest. When there is only one test running then it works just fine but the second one throws the following error:

  ReferenceError: You are trying to `import` a file after the Jest environment has been torn down.
  

  I tested this with two very simple tests:

  describe("Default API", () => {
      describe("Default:", () => {
          it("should create a user in the DB", (done) => {
              request(app).get("/").expect(200, done);
          });
          it("should create a user in the DB", (done) => {
              request(app).get("/").expect(200, done);
          });
      });
  });
  

  They are the same but the second one throws the error. If I run only the first one there is no issue. This must be a setup issue Does anyone have advice. In my index.ts where I have the main express code I export app as follows:

  export default app;

  This is at the bottom of the index.ts file.
• TypeError: Cannot read property 'getContext' of null

  I have created a game using canvas API and now I am testing using Jest. But when running a test for a simple function it throws me this error. my script tag is at the end of the HTML and I also added this event listener to wait for the DOM document.addEventListener("DOMContentLoaded", init,false);

  jest

  PASS tests/sum.test.js FAIL tests/mod.test.js ● Test suite failed to run

  TypeError: Cannot read property 'getContext' of null
  
    20 |   const empty = 0;
    21 |   const nextPieceCanvas = document.querySelector("canvas#nextPiece") as HTMLCanvasElement;
  > 22 |   const NPctx = nextPieceCanvas.getContext("2d")! as CanvasRenderingContext2D;
       |                               ^
    23 |   
    24 |   //Gameboard Canvas
    25 |   const canvas = document.querySelector("canvas#tetris") as HTMLCanvasElement;
  
    at Object.<anonymous> (src/ts/app.ts:22:31)
    at Object.<anonymous> (tests/mod.test.js:2:1)
  

  Test Suites: 1 failed, 1 passed, 2 total Tests: 1 passed, 1 total Snapshots: 0 total Time: 1.424 s Ran all test suites. npm ERR! code ELIFECYCLE npm ERR! errno 1 npm ERR! tetris_ts@1.0.0 test: jest npm ERR! Exit status 1 npm ERR! npm ERR! Failed at the tetris_ts@1.0.0 test script. npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

  npm ERR! A complete log of this run can be found in: npm ERR! /home/alex/.npm/_logs/2021-02-26T22_46_02_771Z-debug.logenter code here
• nestjs unit test createTestingModule Dependency Injection

  I hope you can help me out. I am using Nx with latest angular/nestjs (date: February, 26)

      ...
      "@nestjs/common": "^7.0.0",
      "@nestjs/config": "^0.6.3",
      "@nestjs/core": "^7.0.0",
      "@nestjs/platform-express": "^7.0.0",
      "@nestjs/platform-socket.io": "^7.6.7",
      "@nestjs/websockets": "^7.6.7",
      "jest": "26.2.2",
      "@nrwl/jest": "11.4.0",
      ...
  

  I cannot get my unit test running using NestJS with Jest I want to test following service:

  @Injectable()
  export class CoreApiService {
    logger = new Logger('CoreApiService');
    apiEndpoint;
  
    constructor(private httpService: HttpService, configService: ConfigService) {
      this.apiEndpoint = configService.get('API_SERVICE_ENDPOINT');
    }
  }
  

  and I get following error:

  TypeError: Cannot read property 'get' of undefined
  
  

  so it seems that the ConfigService (and also httpService) is always undefined.

  when logging httpService and ConfigService, it will always be undefined. Even when I try to instantiate new Instances like new CoreApiService(new HttpService(), new ConfigService()) I've even tried things like new CoreApiService({} as any, {get: (...params} => {return 'foo'}) in the test itself

  it will always be the same error mentioned above.

  The test file:

  import { Test, TestingModule } from '@nestjs/testing';
  import { CoreApiService } from './core-api.service';
  import { ConfigModule, ConfigService } from '@nestjs/config';
  import { HttpModule } from '@nestjs/common';
  
  
  class ConfigServiceMock {
    get(key: string): string {
      switch (key) {
        case 'API_SERVICE_ENDPOINT':
          return '';
      }
    }
  }
  
  describe('CoreApiService', () => {
    let module: TestingModule;
    let service: CoreApiService;
  
    beforeEach(async () => {
      module = await Test.createTestingModule({
        imports: [HttpModule, ConfigModule],
        providers: [
          CoreApiService,
          { provide: ConfigService, useClass: ConfigServiceMock },
        ],
      }).compile();
      service = module.get<CoreApiService>(CoreApiService);
    });
  
    it('should be defined', () => {
      expect(service).toBeDefined();
    });
  });
  
  
  

  I've even tried: .overrideProvider(ConfigService).useClass(ConfigServiceMock)

  Thank you in advance!