simplify NXDOMAIN test

- remove premature abstraction
- only do one check

test/200_dns_test.sh

@@ -15,7 +15,6 @@ weave_on $HOST1 run --with-dns $C1/24 -t --name=c1 aanand/docker-dnsutils /bin/s
 
 assert_dns_record $HOST1 c1 $NAME $C2
 
-assert_dns_status $HOST1 c1 "MX   seetwo.weave.local" NXDOMAIN
-assert_dns_status $HOST1 c1 "AAAA seetwo.weave.local" NXDOMAIN
+assert_raises "exec_on $HOST1 c1 dig MX seetwo.weave.local | grep -q \"status: NXDOMAIN\""
 
 end_suite

test/config.sh

@@ -88,18 +88,6 @@ exec_on() {
     docker -H tcp://$host:2375 exec $container "$@"
 }
 
-dig_on() {
-    host=$1
-    cont=$2
-    query=$3
-    docker -H tcp://$host:2375 exec $cont sh -c "dig $query"
-}
-
-# assert_dns_status <host> <container> <name> <query> <status>
-assert_dns_status() {
-    assert_raises "dig_on \"$1\" \"$2\" \"$3\" | grep -q \"status: $4\""
-}
-
 # assert_dns_record <host> <container> <name> <ip>
 assert_dns_record() {
     assert "exec_on $1 $2 getent hosts $3 | tr -s ' '" "$4 $3"