fake localStorage writen for jiotests

test/browserlocalstorage.stub.js

+"use strict";
+var localStorage = {};
+// clear
+Object.defineProperty(localStorage,"clear",{
+    configurable:false,enumerable:false,writable:false,value:function () {
+        var k;
+        for (k in this) {
+            delete this[k];
+        }
+    }
+});
+// key
+Object.defineProperty(localStorage,"key",{
+    configurable:false,enumerable:false,writable:false,value:function (n) {
+        var i, k;
+        if (n < 0 || n >= this.length) {
+            return null;
+        }
+        for (k in this) {
+            if (i === n) {
+                return k;
+            }
+            i += 1
+        }
+        return null;
+    }
+});
+// length
+Object.defineProperty(localStorage,"length",{
+    configurable:false,enumerable:false,writable:true,value:0
+});
+// toString
+Object.defineProperty(localStorage,"toString",{
+    configurable:false,enumerable:false,writable:false,value:function (k, v) {
+        return "[object Storage]";
+    }
+});
+// setItem
+Object.defineProperty(localStorage,"setItem",{
+    configurable:false,enumerable:false,writable:false,value:function (k, v) {
+        if (typeof this[k] === "undefined" &&
+            typeof v !== "undefined") {
+            this.length += 1;
+        }
+        this[k] = v.toString();
+    }
+});
+// getItem
+Object.defineProperty(localStorage,"getItem",{
+    configurable:false,enumerable:false,writable:false,value:function (k) {
+        return this[k] === undefined? null: this[k];
+    }
+});
+// removeItem
+Object.defineProperty(localStorage,"removeItem",{
+    configurable:false,enumerable:false,writable:false,value:function (k) {
+        if (typeof this[k] !== "undefined") {
+            this.length -= 1;
+        }
+        delete this[k];
+    }
+});