From 950b75fd2f0cb07460ab8ea50044cf9813a1af96 Mon Sep 17 00:00:00 2001
From: Scott Kyle <scott@appden.com>
Date: Thu, 28 Apr 2016 16:36:07 -0700
Subject: [PATCH] Fix broken testResultsInvalidation test on Chrome

We needed more actions to actually get sent over the RPC.
---
 lib/browser/collections.js | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/lib/browser/collections.js b/lib/browser/collections.js
index a35dd465..b6091fa2 100644
--- a/lib/browser/collections.js
+++ b/lib/browser/collections.js
@@ -54,7 +54,7 @@ export function fireMutationListeners(realmId) {
 
 export function createCollection(prototype, realmId, info, mutable) {
     let collection = Object.create(prototype);
-    let size = 0;
+    let size;
 
     Object.defineProperties(collection, {
         'length': {
@@ -70,7 +70,10 @@ export function createCollection(prototype, realmId, info, mutable) {
             length = collection.length;
         }
         if (length == size) {
-            return;
+            return;  // Nothing has changed.
+        }
+        if (size == null) {
+            size = 0;  // This is first pass.
         }
 
         let props = {};
@@ -79,7 +82,7 @@ export function createCollection(prototype, realmId, info, mutable) {
             for (let i = size; i < length; i++) {
                 props[i] = {
                     get: getterForProperty(i),
-                    set: mutable ? setterForProperty(i) : undefined,
+                    set: setterForProperty(i),
                     enumerable: true,
                     configurable: true,
                 };
@@ -93,7 +96,8 @@ export function createCollection(prototype, realmId, info, mutable) {
 
         // Helpfully throw an exception on attempts to set to one past the last index.
         props[length] = {
-            value: undefined,
+            get: getterForProperty(length),
+            set: setterForProperty(length),
             configurable: true,
         };