Extending the idea of promise returning spy from http://decodify.blogspot.co.uk/2013/10/angularjs-unit-testing-helper-for.html

jasmineNG.js

var jasmineNG = {};
//set $q in your test
jasmineNG.$q = null;
//Could make similar to test a failing promise
jasmineNG.createPromiseReturningSpy = function() {
  var deferred = jasmineNG.$q.defer();
  // Use .andReturn to simply return a promise
  var spy = jasmine.createSpy().andReturn(deferred.promise);
  // Add resolve and reject functionalities
  spy.andResolveWith = function(val) {
    deferred.resolve(val);
    return spy; // chain
  };
  spy.andRejectWith = function(val) {
    deferred.reject(val);
    return spy;
  };
  return spy;
}

// Usage:
// var spiedFunction = jasmineNG.createPromiseReturningSpy(); // always returns a non-resolved, non-rejected promise
// var spiedFunctionResolved = jasmineNG.createPromiseReturningSpy().andResolveWith('hello'); // promise with resolve
// var spiedFunctionResolved = jasmineNG.createPromiseReturningSpy().andRejectWith('no good'); // promise with reject