Node course - unit testing

Node
1

in the exercise mosh tested a function using the jsonwebtoken library. this is a mistake. this is clearly integration testing and not a unit test.
This unit has dependencies on jwt and on mongoose to generate a valid _id.
the following is the simplest implementation i could get faking the mongoose object and jwt making this almost as much a candidate for integration testing as our routes.

v disappointing mosh!

describe("generateAuthToken", () => {
  it("should return a jwt when called with user id and isAdmin", () => {
    const user = {
      _id: 1,
      isAdmin: false,
      generateAuthToken: User.prototype.generateAuthToken,
    };
    jwt.sign = jest.fn().mockReturnValue("faked Jwt");
    user.generateAuthToken();
    expect(jwt.sign).toHaveBeenCalledWith(
      {
        _id: 1,
        isAdmin: false,
      },
      "12345"
    );
  });
});