diff --git a/tests/test_octodns_source_tinydns.py b/tests/test_octodns_source_tinydns.py
index f4d7a05..47781f2 100644
--- a/tests/test_octodns_source_tinydns.py
+++ b/tests/test_octodns_source_tinydns.py
@@ -17,7 +17,7 @@ class TestTinyDnsFileSource(TestCase):
     def test_populate_normal(self):
         got = Zone('example.com.', [])
         self.source.populate(got)
-        self.assertEqual(24, len(got.records))
+        self.assertEqual(25, len(got.records))
 
         expected = Zone('example.com.', [])
         for name, data in (
@@ -48,6 +48,10 @@ class TestTinyDnsFileSource(TestCase):
                 'cname',
                 {'type': 'CNAME', 'ttl': 3600, 'value': 'www.example.com.'},
             ),
+            (
+                'cname2',
+                {'type': 'CNAME', 'ttl': 48, 'value': 'www2.example.com.'},
+            ),
             (
                 'some-host-abc123',
                 {'type': 'A', 'ttl': 1800, 'value': '10.2.3.7'},
@@ -66,7 +70,7 @@ class TestTinyDnsFileSource(TestCase):
                             'exchange': 'smtp-1-host.example.com.',
                         },
                         {
-                            'preference': 20,
+                            'preference': 0,
                             'exchange': 'smtp-2-host.example.com.',
                         },
                     ],
@@ -212,4 +216,4 @@ class TestTinyDnsFileSource(TestCase):
         got = Zone('example.com.', ['sub'])
         self.source.populate(got)
         # we don't see one www.sub.example.com. record b/c it's in a sub
-        self.assertEqual(23, len(got.records))
+        self.assertEqual(24, len(got.records))
diff --git a/tests/zones/tinydns/example.com b/tests/zones/tinydns/example.com
index 4d373e1..fcb38d4 100755
--- a/tests/zones/tinydns/example.com
+++ b/tests/zones/tinydns/example.com
@@ -26,14 +26,14 @@ Ccname.other.foo:www.other.foo
 
 # MX
 @example.com::smtp-1-host.example.com:10
-@example.com.::smtp-2-host.example.com:20
+@example.com.::smtp-2-host.example.com.
 # MX with ttl and ip
 @smtp.example.com:21.22.23.24:smtp-3-host:30:1800
 @smtp.example.com.:22.23.24.25:smtp-4-host:40:1800
 
 # NS for sub
 .sub.example.com::ns3.ns.com:30
-.sub.example.com.::ns4.ns.com:30
+.sub.example.com.::ns4.ns.com.:30
 # NS with ip
 .other.example.com:14.15.16.17:ns5:30
 .other.example.com.:15.16.17.18:ns6:30
diff --git a/tests/zones/tinydns/other.foo b/tests/zones/tinydns/other.foo
index 82e010d..a96dee2 100644
--- a/tests/zones/tinydns/other.foo
+++ b/tests/zones/tinydns/other.foo
@@ -3,5 +3,6 @@
 
 # CNAME with trailing comment
 Ccname.example.com:www.example.com # this is a comment
+Ccname2.example.com:www2.example.com.:48
 
 +www.other.foo:14.2.3.6