Add test for trigger "changeId"

Author: Christopher Rombach

test/model.js

@@ -1476,4 +1476,15 @@
  assert.equal(model.id, 3);
  });
 
+ QUnit.test('#4289 - Trigger "changeId" need to be generate only if the content id change', function(assert) {
+ assert.expect(1);
+ var model = new Backbone.Model({id: 1});
+ model.idAttribute = 'id';
+ model.on('changeId', function(m) {
+ assert.equal(m.get('id'), 2);
+ });
+ model.set({id: 1});
+ model.set({id: 2});
+ });
+
 })(QUnit);