diff -r 000000000000 -r 6474c204b198 js/src/jsapi-tests/testIsInsideNursery.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jsapi-tests/testIsInsideNursery.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,37 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+* vim: set ts=8 sts=4 et sw=4 tw=99:
+*/
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "jsapi-tests/tests.h"
+
+BEGIN_TEST(testIsInsideNursery)
+{
+    /* Non-GC things are never inside the nursery. */
+    CHECK(!js::gc::IsInsideNursery(rt, rt));
+    CHECK(!js::gc::IsInsideNursery(rt, nullptr));
+    CHECK(!js::gc::IsInsideNursery(nullptr));
+
+    JS_GC(rt);
+
+    JS::RootedObject object(cx, JS_NewObject(cx, nullptr, JS::NullPtr(), JS::NullPtr()));
+
+#ifdef JSGC_GENERATIONAL
+    /* Objects are initially allocated in the nursery. */
+    CHECK(js::gc::IsInsideNursery(rt, object));
+    CHECK(js::gc::IsInsideNursery(object));
+#else
+    CHECK(!js::gc::IsInsideNursery(rt, object));
+    CHECK(!js::gc::IsInsideNursery(object));
+#endif
+
+    JS_GC(rt);
+
+    CHECK(!js::gc::IsInsideNursery(rt, object));
+    CHECK(!js::gc::IsInsideNursery(object));
+
+    return true;
+}
+END_TEST(testIsInsideNursery)