From f71004fc7ac99113a525f8453bacc5aa39a36fcd Mon Sep 17 00:00:00 2001
From: Casey Foster <c@sey.me>
Date: Mon, 10 Dec 2012 21:28:12 -0800
Subject: [PATCH] Add failing test case for different `idAttribute` fields

---
 test/collection.js | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/test/collection.js b/test/collection.js
index eb7f981a..133aa9a5 100644
--- a/test/collection.js
+++ b/test/collection.js
@@ -824,4 +824,13 @@ $(document).ready(function() {
     strictEqual(c.length, 0);
   });
 
+  test("`update` with non-normal id", function() {
+    var Collection = Backbone.Collection.extend({
+      model: Backbone.Model.extend({idAttribute: '_id'})
+    });
+    var collection = new Collection({_id: 1});
+    collection.update([{_id: 1, a: 1}], {add: false});
+    equal(collection.first().get('a'), 1);
+  });
+
 });