ipaddr filter - return a network address when given an address with /32 subnet (#47539)

* fix #17872

* add changelog fragment and enable unit test

changelogs/fragments/47539-fix-netaddr-network.yaml

@@ -0,0 +1,2 @@
+bugfixes:
+  - ipaddr - fix issue where network address was blank for 0-size networks (https://github.com/ansible/ansible/issues/17872)

lib/ansible/plugins/filter/ipaddr.py

@@ -249,7 +249,6 @@ def _netmask_query(v):
 
 def _network_query(v):
     '''Return the network of a given IP or subnet'''
-    if v.size > 1:
     return str(v.network)
 
 

test/units/plugins/filter/test_ipaddr.py

@@ -38,15 +38,14 @@ class TestIpFilter(unittest.TestCase):
         self.assertEqual(ipaddr(address, 'netmask'), '255.255.255.255')
 
     def test_network(self):
-        # Unfixable in current state
-        # address = '1.12.1.34/32'
-        # self.assertEqual(ipaddr(address, 'network'), '1.12.1.34')
-        # address = '1.12.1.34/255.255.255.255'
-        # self.assertEqual(ipaddr(address, 'network'), '1.12.1.34')
-        # address = '1.12.1.34'
-        # self.assertEqual(ipaddr(address, 'network'), '1.12.1.34')
-        # address = '1.12.1.35/31'
-        # self.assertEqual(ipaddr(address, 'network'), '1.12.1.34')
+        address = '1.12.1.34/32'
+        self.assertEqual(ipaddr(address, 'network'), '1.12.1.34')
+        address = '1.12.1.34/255.255.255.255'
+        self.assertEqual(ipaddr(address, 'network'), '1.12.1.34')
+        address = '1.12.1.34'
+        self.assertEqual(ipaddr(address, 'network'), '1.12.1.34')
+        address = '1.12.1.35/31'
+        self.assertEqual(ipaddr(address, 'network'), '1.12.1.34')
         address = '1.12.1.34/24'
         self.assertEqual(ipaddr(address, 'network'), '1.12.1.0')