fix($q): make $q.reject support finally and catch

Add support for the functions `finally` and `catch` to the
promise returned by `$q.reject`

Closes angular#6048

src/ng/q.js

@@ -223,7 +223,7 @@ function qFactory(nextTick, exceptionHandler) {
 
 
  reject: function(reason) {
- deferred.resolve(reject(reason));
+ deferred.resolve(_reject(reason));
  },
 
 
@@ -380,6 +380,12 @@ function qFactory(nextTick, exceptionHandler) {
  * @returns {Promise} Returns a promise that was already resolved as rejected with the `reason`.
  */
  var reject = function(reason) {
+ var result = defer();
+ result.reject(reason);
+ return result.promise;
+ };
+
+ var _reject = function(reason) {
  return {
  then: function(callback, errback) {
  var result = defer();

test/ng/qSpec.js

@@ -959,6 +959,13 @@ describe('q', function() {
  mockNextTick.flush();
  expect(log).toEqual(['errorBroken(rejected)->throw(catch me!)', 'errorAffected(catch me!)->reject(catch me!)']);
  });
+
+
+ it('should have functions `finally` and `catch`', function() {
+ var rejectedPromise = q.reject('rejected');
+ expect(rejectedPromise['finally']).not.toBeUndefined();
+ expect(rejectedPromise['catch']).not.toBeUndefined();
+ });
  });