Estou realizando o curso implementando os mesmos comandos só que para outro exemplo mais obtive um erro alguém pode me ajudar:
meu index.js
const somaCalculadora = (a, b) => a + b;
const subCalculadora = (c, d) => c - d;
export {
  somaCalculadora,
  subCalculadora,
};dentro de uma pasta test tenho arquivo calculadora.test.js
import { somaCalculadora, subCalculadora } from '../index.js';
describe('Deve retornar a soma entre dois numeros', () => {
  const esperado = 30;
  const retornado = somaCalculadora(10, 20);
  expect(retornado).toBe(esperado);
});meu package.json
{
  "name": "aula1",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "node --experimental-vm-modules node_modules/jest/bin/jest.js",
    "test:watch": "node --experimental-vm-modules node_modules/jest/bin/jest.js --watch",
    "test:coverage": "node --experimental-vm-modules node_modules/jest/bin/jest.js --watch --coverage"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "eslint": "^8.24.0",
    "eslint-config-airbnb-base": "^15.0.0",
    "eslint-plugin-import": "^2.26.0"
  },
  "dependencies": {
    "jest": "28.1.0",
    "save-dev": "0.0.1-security"
  },
  "type":"module"
}quando realizo o teste npm run test
> aula1@1.0.0 test
> node --experimental-vm-modules node_modules/jest/bin/jest.js
(node:2448) ExperimentalWarning: VM Modules is an experimental feature. This feature could change at any time
(Use `node --trace-warnings ...` to show where the warning was created)
 FAIL  test/calculadora.test.js
  ● Test suite failed to run
    Your test suite must contain at least one test.
      at onResult (node_modules/@jest/core/build/TestScheduler.js:172:18)
      at node_modules/@jest/core/build/TestScheduler.js:300:17
      at node_modules/emittery/index.js:311:13
          at Array.map (<anonymous>)
      at Emittery.emit (node_modules/emittery/index.js:309:23)
Test Suites: 1 failed, 1 total
Tests:       0 total
Snapshots:   0 total
Time:        1.742 s
Ran all test suites. 
             
            