diff -r 000000000000 -r 6474c204b198 js/src/jsapi-tests/testIntString.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jsapi-tests/testIntString.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,42 @@
+/* -*- 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(testIntString_bug515273)
+{
+    JS::RootedValue v(cx);
+
+    EVAL("'1';", &v);
+    JSString *str = JSVAL_TO_STRING(v);
+    CHECK(JS_StringHasBeenInterned(cx, str));
+    CHECK(JS_FlatStringEqualsAscii(JS_ASSERT_STRING_IS_FLAT(str), "1"));
+
+    EVAL("'42';", &v);
+    str = JSVAL_TO_STRING(v);
+    CHECK(JS_StringHasBeenInterned(cx, str));
+    CHECK(JS_FlatStringEqualsAscii(JS_ASSERT_STRING_IS_FLAT(str), "42"));
+
+    EVAL("'111';", &v);
+    str = JSVAL_TO_STRING(v);
+    CHECK(JS_StringHasBeenInterned(cx, str));
+    CHECK(JS_FlatStringEqualsAscii(JS_ASSERT_STRING_IS_FLAT(str), "111"));
+
+    /* Test other types of static strings. */
+    EVAL("'a';", &v);
+    str = JSVAL_TO_STRING(v);
+    CHECK(JS_StringHasBeenInterned(cx, str));
+    CHECK(JS_FlatStringEqualsAscii(JS_ASSERT_STRING_IS_FLAT(str), "a"));
+
+    EVAL("'bc';", &v);
+    str = JSVAL_TO_STRING(v);
+    CHECK(JS_StringHasBeenInterned(cx, str));
+    CHECK(JS_FlatStringEqualsAscii(JS_ASSERT_STRING_IS_FLAT(str), "bc"));
+
+    return true;
+}
+END_TEST(testIntString_bug515273)