Mocking js aws-sdk using sinon (rough notes)

example-aws-mock.js

beforeEach(function () {
  this.aws = {};
  stubAwsRequest(stubs);
});

afterEach(function () {
  AWS.Request.prototype.runTo.restore();
});

AWS.Request.prototype.originalRunTo = AWS.Request.prototype.runTo;
function stubAwsRequest (stubs) {
  sinon.stub(AWS.Request.prototype, 'runTo', function (state, done) {
    // We take a nasty shortcut here, and assume that any defined
    // state doesn't get to actually sending (true as of now
    // in 2.5.2 - this is only used for 'build' internally).
    if (state !== undefined) {
      return this.originalRunTo(state, done);
    }

    // undefined state means we want to run to the end...
    // i.e. stop at 'send' and then emit.
    return this.originalRunTo('send', function (err) {
      if (done) {
        done.apply(this, arguments);
      }

      // if there's an err, it will already have triggered
      // complete/error etc.
      if (!err) {
        try {
          this.response.data = stubs[this.service.serviceIdentifier][this.operation](this.params);
          this.emit('success', [this.response]);
        } catch (err) {
          this.response.error = err;
          this.emit('error', [this.response]);
        }
        this.emit('complete', [this.response]);
      }
    });
  })
}


define('some test using sns', function () {
  beforeEach(function () {
    this.aws.sns = {
      publish: sinon.stub()
    }
  });

  it('do something', function () {
    dostuff();
    this.aws.sns.publish.should.have.been.calledWith({...});
  });
});