+m4_divert_push([PREPARE_TESTS])
+[
+# Strips out uninteresting parts of ovs-ofctl output, as well as parts
+# that vary from one run to another.
+ofctl_strip () {
+ sed '
+s/ (xid=0x[0-9a-fA-F]*)//
+s/ duration=[0-9.]*s,//
+s/ cookie=0x0,//
+s/ table=0,//
+s/ n_packets=0,//
+s/ n_bytes=0,//
+s/ idle_age=[0-9]*,//
+s/ hard_age=[0-9]*,//
+'
+}]
+m4_divert_pop([PREPARE_TESTS])
+