Use raises correctly.

test/collection.js

@@ -125,17 +125,17 @@ $(document).ready(function() {
       equal(col.at(i).get('at'), i);
     }
   });
-  
+
   test("Collection: add; at should have preference over comparator", function() {
     var Col = Backbone.Collection.extend({
       comparator: function(a,b) {
         return a.id > b.id ? -1 : 1;
       }
     });
-    
+
     var col = new Col([{id: 2}, {id: 3}]);
     col.add(new Backbone.Model({id: 1}), {at:   1});
-    
+
     equal(col.pluck('id').join(' '), '3 1 2');
   });
 
@@ -519,7 +519,9 @@ $(document).ready(function() {
       var col = new Collection;
 
       col.add([{id: 1}, {id: 2}, {id: 3}, {id: 4}, {id: 5}, {id: 6}]);
-    }, "Can't add an invalid model to a collection");
+    }, function(e) {
+      return e.message === "Can't add an invalid model to a collection";
+    });
   });
 
   test("Collection: index with comparator", function() {