Utility function for working with promises in angular tests.

createPromiseSpy.js

var createPromiseSpy = function(obj, name, method, $q) {
  var createdSpy = jasmine.createSpy(name, obj);
  var returnObj = {};
  var promise = {};

  if (typeof(method) === 'string') {
    var deferred = $q.defer();
    spyOn(createdSpy, method).and.returnValue(deferred.promise);
    promise[method] = deferred;
  }

  returnObj.instance = createdSpy;
  returnObj.promise = promise;
  return returnObj;
};