test(select): add test against updating selected property on digest with no change event

Commit dc149de was reverted to fix regressions angular#7715 and angular#7855.
This commit introduced this test case and a corresponding fix for preventing the update of the
selected property of an option element on a digest with no change event. Although the previous fix
introduced regressions, the test covers a valid issue and should be included.

Author: Erin Altenhof-Long

test/ng/directive/selectSpec.js

@@ -733,6 +733,27 @@ describe('select', function() {
       expect(sortedHtml(options[2])).toEqual('<option value="1">3</option>');
     });
 
+    it('should not update selected property of an option element on digest with no change event',
+        function() {
+      createSingleSelect();
+
+      scope.$apply(function() {
+        scope.values = [{name: 'A'}, {name: 'B'}, {name: 'C'}];
+        scope.selected = scope.values[0];
+      });
+
+      var options = element.find('option');
+      var optionToSelect = options.eq(1);
+
+      expect(optionToSelect.text()).toBe('B');
+
+      optionToSelect.prop('selected', true);
+      scope.$digest();
+
+      expect(optionToSelect.prop('selected')).toBe(true);
+      expect(scope.selected).toBe(scope.values[0]);
+    });
+
     describe('binding', function() {
 
       it('should bind to scope value', function() {