1 files changed, 16 insertions, 0 deletions
diff --git a/testing/web-platform/tests/webstorage/storage_builtins.window.js b/testing/web-platform/tests/webstorage/storage_builtins.window.js
new file mode 100644
index 0000000000..72bb90db21
--- /dev/null
+++ b/testing/web-platform/tests/webstorage/storage_builtins.window.js
@@ -0,0 +1,16 @@
+["localStorage", "sessionStorage"].forEach(function(name) {
+    test(function() {
+        var storage = window[name];
+        storage.clear();
+        assert_equals(storage.length, 0, "storage.length");
+
+        var builtins = ["key", "getItem", "setItem", "removeItem", "clear"];
+        var origBuiltins = builtins.map(function(b) { return Storage.prototype[b]; });
+        assert_array_equals(builtins.map(function(b) { return storage[b]; }), origBuiltins, "a");
+        builtins.forEach(function(b) { storage[b] = b; });
+        assert_array_equals(builtins.map(function(b) { return storage[b]; }), origBuiltins, "b");
+        assert_array_equals(builtins.map(function(b) { return storage.getItem(b); }), builtins, "c");
+
+        assert_equals(storage.length, builtins.length, "storage.length");
+    }, "Builtins in " + name);
+});