--- /dev/null
+#!/bin/sh
+# This work is licensed under the terms of the GNU LGPL, version 2 or later.
+# See the COPYING.LIB file in the top-level directory.
+
+PYTHON=$1
+DECODETREE=$2
+E=0
+
+# All of these tests should produce errors
+for i in err_*.decode; do
+ if $PYTHON $DECODETREE $i > /dev/null 2> /dev/null; then
+ # Pass, aka failed to fail.
+ echo FAIL: $i 1>&2
+ E=1
+ fi
+done
+
+exit $E