feat(ngMock): support delay limit for $timeout.flush

src/ngMock/angular-mocks.js

@@ -1487,9 +1487,11 @@ angular.mock.$TimeoutDecorator = function($delegate, $browser) {
    * @description
    *
    * Flushes the queue of pending tasks.
+   *
+   * @param {number=} delay maximum timeout amount to flush up until
    */
-  $delegate.flush = function() {
-    $browser.defer.flush();
+  $delegate.flush = function(delay) {
+    $browser.defer.flush(delay);
   };
 
   /**

test/ngMock/angular-mocksSpec.js

@@ -351,6 +351,20 @@ describe('ngMock', function() {
       $timeout.flush();
       expect(function() {$timeout.verifyNoPendingTasks();}).not.toThrow();
     }));
+
+
+    it('should check against the delay if provided within timeout', inject(function($timeout) {
+      $timeout(noop, 100);
+      $timeout.flush(100);
+      expect(function() {$timeout.verifyNoPendingTasks();}).not.toThrow();
+
+      $timeout(noop, 1000);
+      $timeout.flush(100);
+      expect(function() {$timeout.verifyNoPendingTasks();}).toThrow();
+
+      $timeout.flush(900);
+      expect(function() {$timeout.verifyNoPendingTasks();}).not.toThrow();
+    }));
   });