Return promises from Ember 2.16 Component Integration Tests Mocked action

I am creating tests for my Ember 2.16 application, and running into an issue where the code is dependent on a promise being returned from an external action.

const promise = this.sendAction('action')
promise.then(() => {
  //do stuff
});

A majority of my code is based in these .then and .catch conditionals on the promise, so I want to be able to return a promise that was successful and that failed. I have heard of Sinon, but unfortunately it is only for Ember 3.4 and above.

test('', function(assert){
  this.set('action', () => {
    // do assertions
    return new Promise(() => {return true} );
  });
});

Inside my integration test I am able to mock out the action, but I run into the "promise" being undefined. I have attempted to return Text, or other values, but when putting a debugger into the component the promise is always undefined.

I can get around this by adding a conditional that checks to see if there is a promise, but since the majority of my code is inside these .then and .catchconditionals I want my tests to step through these to increase the code coverage.

How would I return a promise from a mocked out action in an Integration Test?