diff -r 000000000000 -r 6474c204b198 xpcom/tests/TestXPIDLString.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/tests/TestXPIDLString.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,18 @@
+#include "nsString.h"
+#include "nsReadableUtils.h"
+#include "nsXPIDLString.h"
+
+static void
+nsXPIDLStringTest_Value(char16_t** aResult)
+{
+    *aResult = ToNewUnicode(NS_LITERAL_STRING("Hello, World"));
+}
+
+int
+main(int argc, char* argv[])
+{
+    nsXPIDLString s1;
+    nsXPIDLStringTest_Value(getter_Copies(s1));
+    return 0;
+}
+