For tutorial: Mastering the Art of Mocking ES Modules in Jest

functionToTest_correct.spec.js

import { jest } from "@jest/globals"

let mockedDependencyValue

jest.unstable_mockModule("./dependency.js", () => ({
  dependency: () => mockedDependencyValue
}));

describe("functionToTest", () => {
  afterEach(() => {
    jest.restoreAllMocks()
  })

  it("should return the correct value 1", async () => {
    mockedDependencyValue = "the mocked dependency 1"
    const { functionToTest } = await import("./functionToTest.js")
    
    expect(functionToTest()).toBe(mockedDependencyValue)
  })
  
  it("should return the correct value 2", async () => {
    mockedDependencyValue = "the mocked dependency 2"
    const { functionToTest } = await import("./functionToTest.js")
    
    expect(functionToTest()).toBe(mockedDependencyValue)
  })
})