check that example/DS is not fetched when validating a.example

bin/tests/system/dnssec/tests.sh

@@ -184,6 +184,15 @@ n=$((n+1))
 test "$ret" -eq 0 || echo_i "failed"
 status=$((status+ret))
 
+echo_i "checking that 'example/DS' from the referral was used in previous validation ($n)"
+ret=0
+grep "query 'example/DS/IN' approved" ns1/named.run > /dev/null && ret=1
+grep "fetch: example/DS" ns4/named.run > /dev/null && ret=1
+grep "validating example/DS: starting" ns4/named.run > /dev/null || ret=1
+n=$((n+1))
+test "$ret" -eq 0 || echo_i "failed"
+status=$((status+ret))
+
 if [ -x ${DELV} ] ; then
    ret=0
    echo_i "checking positive validation NSEC using dns_client ($n)"