1 files changed, 27 insertions, 0 deletions
diff --git a/js/src/jsapi-tests/testSameValue.cpp b/js/src/jsapi-tests/testSameValue.cpp
new file mode 100644
index 000000000..d75c47b94
--- /dev/null
+++ b/js/src/jsapi-tests/testSameValue.cpp
@@ -0,0 +1,27 @@
+/* -*- 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(testSameValue)
+{
+
+    /*
+     * NB: passing a double that fits in an integer jsval is API misuse.  As a
+     * matter of defense in depth, however, JS_SameValue should return the
+     * correct result comparing a positive-zero double to a negative-zero
+     * double, and this is believed to be the only way to make such a
+     * comparison possible.
+     */
+    JS::RootedValue v1(cx, JS::DoubleValue(0.0));
+    JS::RootedValue v2(cx, JS::DoubleValue(-0.0));
+    bool same;
+    CHECK(JS_SameValue(cx, v1, v2, &same));
+    CHECK(!same);
+    return true;
+}
+END_TEST(testSameValue)