Add NULL SRV record examples to unit tests

tests/config/unit.tests.yaml

@@ -36,6 +36,22 @@
     - flags: 0
       tag: issue
       value: ca.unit.tests
+_imap._tcp:
+  ttl: 600
+  type: SRV
+  values:
+  - port: 0
+    priority: 0
+    target: .
+    weight: 0
+_pop3._tcp:
+  ttl: 600
+  type: SRV
+  values:
+  - port: 0
+    priority: 0
+    target: .
+    weight: 0
 _srv._tcp:
   ttl: 600
   type: SRV

tests/zones/unit.tests.tst

@@ -20,6 +20,9 @@ caa         1800  IN  CAA 0 iodef "mailto:admin@unit.tests"
 ; SRV Records
 _srv._tcp   600   IN  SRV 10 20 30 foo-1.unit.tests.
 _srv._tcp   600   IN  SRV 10 20 30 foo-2.unit.tests.
+; NULL SRV Records
+_pop3._tcp   600   IN  SRV 0 0 0 .
+_imap._tcp   600   IN  SRV 0 0 0 .
 
 ; TXT Records
 txt         600   IN  TXT "Bah bah black sheep"