javascript - Jest Mock changes to undefined from one line to another

Question

I want to test my AWS Lambda functions written in typescript. The problem is that I'm mocking a service, which initially works fine and has all expected functions, but from one line to the other it turns to undefined, even though in the console.log right before it is defined.

My lambda function:

export const changePassword = LambdaUtils.wrapApiHandler(
async (event: LambdaUtils.APIGatewayProxyEvent, context: Context) => {

    const accessToken = event?.body?.accessToken;
    const previousPassword = event?.body?.previousPassword;
    const proposedPassword = event?.body?.proposedPassword;

    // let authenticationService = Injector.getByName("AuthenticationService"); // I tried mocking this object but given the dependency injection it is always undefined

    //Request
    const authenticationService = new AuthenticationService(); // Here it is perfectly mocked
    console.log("-> authenticationService", authenticationService); // Here it is also defined with all functions
    const response = await authenticationService.changePassword( 
        accessToken,
        previousPassword,
        proposedPassword
    ); //Here authenticationService is undefined

    console.log("response in auth_handler", response);

    
    if (response?.statusCode === 200) {
        return new LambdaUtilities().createHttp200Response(response);
    } 
}

);

My test component:

jest.mock("../../../controllers/auth.service");
const MockedAuthService = AuthenticationService as jest.Mock<AuthenticationService>;

.....

  test(`Test successful response of changePassword Repo function"`, async () => {
    const accessToken = "accessToken";
    const previousPassword = "123456";
    const proposedPassword = "654321";

    const mockAuthService = new MockedAuthService() as jest.Mocked<AuthenticationService>;
    console.log("-> mockAuthService", mockAuthService);

    const event = {
        body: {
            accessToken,
            proposedPassword,
            previousPassword
        }
    };
    const response = await changePassword(event, {}, {});

    console.log("response", response);
    expect(response).not.toBeNull();
});

Here are screenshots from a debug with PyCharm:

Answer 1

等待大神答复