Diff not working when comparison is in a callback

[alexrass]

Any chance this could be fixed? When doing a object comparison inside of a callback, instead of displaying a nice diff, all you get is:

WARN: 'Unhandled rejection AssertionError: expected [ Array(1) ] to deeply equal [ Array(1) ]'

Example code:

describe('Some test', () => {
  let sandbox;

  beforeEach(() => {
    sandbox = sinon.sandbox.create();
    sandbox.useFakeServer();
    sandbox.server.autoRespond = true;
  });

  afterEach(() => {
    sandbox.restore();
  });

  it('should run some test with a callback', (done) => {
    const someResponse = [{ some: 'response' }];
    sandbox.server.respondWith('GET', '/a/url', (request) => {
      request.respond(
        200,
        { 'Content-Type': 'application/json' },
        JSON.stringify(someResponse)
      );
    });

    somePromise.then((someCollection) => {
      someCollection.toJSON().should.deep.equal(someResponse);

      done();

      return null;
    });
  });

});

I'm using chaijs for assertions, backbone+marionette, and bluebirdjs for promises.

[4kochi]

I am not sure if this is a problem with the reporter itself. I played around with some simple bluebird promises and it works. I also found a stack overflow thread with suggest 2 points.

First to return the promise itself instead of calling done within the promise. And second also return the result of the assertion. Reference (http://stackoverflow.com/questions/30405551/how-to-register-a-failed-mocha-test-on-a-promise)

So your example becomes this:

describe('Some test', () => {
  let sandbox;

  beforeEach(() => {
    sandbox = sinon.sandbox.create();
    sandbox.useFakeServer();
    sandbox.server.autoRespond = true;
  });

  afterEach(() => {
    sandbox.restore();
  });

  it('should run some test with a callback', (done) => {
    const someResponse = [{ some: 'response' }];
    sandbox.server.respondWith('GET', '/a/url', (request) => {
      request.respond(
        200,
        { 'Content-Type': 'application/json' },
        JSON.stringify(someResponse)
      );
    });

    return somePromise.then((someCollection) => {
      return someCollection.toJSON().should.deep.equal(someResponse);
    });
  });
});

But I was not able to run you example because I need more informations to see it up. So if you still have the error it would be nice if you could give me a full working example. That would really help me to reproduce the problem.