test(select): add test of updating the model because of ng-change

A regression #7855 was introduced by
https://github.com/angular/angular.js/commit/dc149de9364c66b988f169f67cad39577ba43434
This test ensures that reverting that commit fixes this regression.
In the regression, changes to a bound model in ng-change were not propagated back to the view.

Test for #7855

test/ng/directive/selectSpec.js

@@ -1134,6 +1134,31 @@ describe('select', function() {
         browserTrigger(element, 'change');
         expect(scope.selected).toEqual(null);
       });
+
+
+      // Regression https://github.com/angular/angular.js/issues/7855
+      it('should update the model with ng-change', function() {
+        createSelect({
+          'ng-change':'change()',
+          'ng-model':'selected',
+          'ng-options':'value for value in values'
+        });
+
+        scope.$apply(function() {
+          scope.values = ['A', 'B'];
+          scope.selected = 'A';
+        });
+
+        scope.change = function() {
+          scope.selected = 'A';
+        };
+
+        element.find('option')[1].selected = true;
+
+        browserTrigger(element, 'change');
+        expect(element.find('option')[0].selected).toBeTruthy();
+        expect(scope.selected).toEqual('A');
+      });
     });
 
     describe('disabled blank', function() {
@@ -1223,6 +1248,7 @@ describe('select', function() {
         expect(scope.selected).toEqual([scope.values[0]]);
       });
 
+
       it('should select from object', function() {
         createSelect({
           'ng-model':'selected',