diff -r 000000000000 -r 6474c204b198 uriloader/exthandler/tests/WriteArgument.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/uriloader/exthandler/tests/WriteArgument.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,24 @@
+#include <stdio.h>
+#include "prenv.h"
+
+int main(int argc, char* argv[])
+{
+  if (argc != 2)
+    return 1;
+
+  const char* value = PR_GetEnv("WRITE_ARGUMENT_FILE");
+
+  if (!value)
+    return 2;
+
+  FILE* outfile = fopen(value, "w");
+  if (!outfile)
+    return 3;
+
+  // We only need to write out the first argument (no newline).
+  fputs(argv[argc -1], outfile);
+
+  fclose(outfile);
+
+  return 0;
+}