JavaScript Jest testing mongoose model instantiation jest testing mongoose,jest test mongoose model

I'm trying to test a REST API built with express and mongoose, I'm using jest and supertest for the http calls; also I'm relatively new to testing with javascript.

When testing a creation url I wan't to make sure the instantiation is called using just the req.body object but I'm not sure how to do it, after reading a lot about differences between mock objects and stubs and some of the Jest documentation my last try looks like this:

test('Should instantiate the model using req.body', done => {

  const postMock = jest.fn();

  const testPost = {
    name: 'Test post',
    content: 'Hello'
  };

  postMock.bind(Post); // <- Post is my model

  // I mock the save function so it doesn't use the db at all
  Post.prototype.save = jest.fn(cb => cb(null, testPost));

  // Supertest call
  request(app).post('/posts/')
  .send(testPost)
  .then(() => {
    expect(postMock.mock.calls[0][0]).toEqual(testPost);
    done();
  })
  .catch(err => {throw err});

});

Also I would like to know how to manually fail the test on the promise rejection, so it doesn't throws the Timeout - Async callback was not invoked within timeout specified by jasmine.DEFAULT_TIMEOUT_INTERVAL.

Answer:1

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