Improve DNS table models

This commit adds Meta information and __str__ methods  to all DNS table
models. The new methods are now covered with new tests. The new
constants DNS_DOMAIN_METADATA_KINDS and DNS_TSIG_KEY_ALGORITHMS are
defined and used in the DNSDomainMetadata and DNSTSIGKey models. A
matching database schema migration is added.

Addresses #17

gnuviechadmin/domains/tests/test_models.py

@@ -10,9 +10,16 @@ from django.test import TestCase
 from django.contrib.auth import get_user_model
 
 from domains.models import (
+    DNSComment,
+    DNSCryptoKey,
+    DNSDomain,
+    DNSDomainMetadata,
+    DNSRecord,
+    DNSSupermaster,
+    DNSTSIGKey,
     DomainBase,
-    MailDomain,
     HostingDomain,
+    MailDomain,
 )
 from hostingpackages.models import (
     CustomerHostingPackage,
@@ -27,14 +34,14 @@ TEST_USER = 'test'
 
 class DomainBaseTest(TestCase):
 
-    def test__str__(self):
+    def test___str__(self):
         db = DomainBase(domain='test')
         self.assertEqual(str(db), 'test')
 
 
 class MailDomainTest(TestCase):
 
-    def test__str__(self):
+    def test___str__(self):
         md = MailDomain.objects.create(domain='example.org')
         self.assertEqual(str(md), 'example.org')
 
@@ -77,8 +84,65 @@ class HostingDomainManagerTest(TestCase):
         self.assertIsNotNone(hostingdomain)
         self.assertTrue(hostingdomain.customer, package.customer)
 
+
 class HostingDomainTest(TestCase):
 
-    def test__str__(self):
+    def test___str__(self):
         hostingdomain = HostingDomain(domain='test')
         self.assertEqual(str(hostingdomain), 'test')
+
+
+class DNSDomainTest(TestCase):
+
+    def test___str__(self):
+        dnsdomain = DNSDomain(domain='test')
+        self.assertEqual(str(dnsdomain), 'test')
+
+
+class DNSRecordTest(TestCase):
+
+    def test___str__(self):
+        dnsrecord = DNSRecord(
+            name='localhost', recordtype='A', content='127.0.0.1')
+        self.assertEqual(str(dnsrecord), 'localhost IN A 127.0.0.1')
+
+
+class DNSSupermasterTest(TestCase):
+
+    def test___str__(self):
+        dnssupermaster = DNSSupermaster(
+            ip='127.0.0.1', nameserver='dns.example.org')
+        self.assertEqual(str(dnssupermaster), '127.0.0.1 dns.example.org')
+
+
+class DNSCommentTest(TestCase):
+
+    def test___str__(self):
+        dnscomment = DNSComment(
+            name='localhost', commenttype='A', comment='good stuff')
+        self.assertEqual(str(dnscomment), 'localhost IN A: good stuff')
+
+
+class DNSDomainMetadataTest(TestCase):
+
+    def test___str__(self):
+        dnsdomain = DNSDomain(domain='test')
+        dnsdomainmetadata = DNSDomainMetadata(
+            domain=dnsdomain, kind='SOA-EDIT', content='INCEPTION')
+        self.assertEqual(str(dnsdomainmetadata), 'test SOA-EDIT INCEPTION')
+
+
+class DNSCryptoKeyTest(TestCase):
+
+    def test___str__(self):
+        dnsdomain = DNSDomain(domain='test')
+        dnscryptokey = DNSCryptoKey(domain=dnsdomain, content='testvalue')
+        self.assertEqual(str(dnscryptokey), 'test testvalue')
+
+
+class DNSTSIGKeyTest(TestCase):
+
+    def test___str__(self):
+        dnstsigkey = DNSTSIGKey(
+            name='testkey', algorithm='hmac-md5', secret='dummykey')
+        self.assertEqual(str(dnstsigkey), 'testkey hmac-md5 XXXX')