I can't seem to make the tests fails anywhere so far about testing-nestjs HOT 3 CLOSED

pnpm nx run simple-sample:test

> [email protected] nx /home/jay/Documents/code/projects/testing-nestjs
> nx "run" "simple-sample:test"


> nx run simple-sample:test

● Validation Warning:

  Unknown option "collectCoverage" with value true was found.
  This is probably a typing mistake. Fixing it will remove this message.

  Configuration Documentation:
  https://jestjs.io/docs/configuration

ts-jest[config] (WARN) message TS151001: If you have issues related to imports, you should consider setting `esModuleInterop` to `true` in your TypeScript configuration file (usually `tsconfig.json`). See https://blogs.msdn.microsoft.com/typescript/2018/01/31/announcing-typ
escript-2-7/#easier-ecmascript-module-interoperability for more information.
ts-jest[config] (WARN) message TS151001: If you have issues related to imports, you should consider setting `esModuleInterop` to `true` in your TypeScript configuration file (usually `tsconfig.json`). See https://blogs.msdn.microsoft.com/typescript/2018/01/31/announcing-typ
escript-2-7/#easier-ecmascript-module-interoperability for more information.
 FAIL  apps/simple-sample/src/app.service.spec.ts
  ● AppService › getHello › should fail for being blatantly wrong

    expect(received).toEqual(expected) // deep equality

    Expected: 42
    Received: 20

      21 |     });
      22 |     it('should fail for being blatantly wrong', () => {
    > 23 |       expect(20).toEqual(42);
         |                  ^
      24 |     });
      25 |   });
      26 | });

      at Object.<anonymous> (src/app.service.spec.ts:23:18)

 PASS  apps/simple-sample/src/app.controller.spec.ts
-------------------|---------|----------|---------|---------|-------------------
File               | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
-------------------|---------|----------|---------|---------|-------------------
All files          |     100 |      100 |     100 |     100 |
 app.controller.ts |     100 |      100 |     100 |     100 |
 app.service.ts    |     100 |      100 |     100 |     100 |
-------------------|---------|----------|---------|---------|-------------------

Test Suites: 1 failed, 1 passed, 2 total
Tests:       1 failed, 4 passed, 5 total
Snapshots:   0 total
Time:        4.251 s
Ran all test suites.

 ————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————

 >  NX   Ran target test for project simple-sample (5s)

    ✖    1/1 failed
    ✔    0/1 succeeded [0 read from cache]

 ELIFECYCLE  Command failed with exit code 1.