[test] Added test for subnet/32

openwisp_ipam/api/views.py

@@ -137,10 +137,15 @@ def count(self):
         if self.stop is not None:
             return self.stop - self.start
         broadcast = int(self.subnet.subnet.broadcast_address)
-        if self.subnet.subnet.max_prefixlen == 32:
-            if self.subnet.subnet._prefixlen == 32:
+        # IPV4
+        if self.subnet.subnet.version == 4:
+            # Networks with a mask of 32 will return a list
+            # containing the single host address
+            if self.subnet.subnet.prefixlen == 32:
                 return 1
+            # Other than subnet /32, exclude broadcast
             return broadcast - self.network - 1
+        # IPV6
         else:
             return broadcast - self.network
 

openwisp_ipam/tests/test_admin.py

@@ -426,3 +426,12 @@ def assert_response(response):
                 reverse('admin:ipam_export_subnet', args=[subnet.id]), follow=True
             )
             assert_response(response)
+
+    def test_subnet_32(self):
+        subnet = self._create_subnet(subnet='192.168.0.0/32', description='Subnet 32')
+        try:
+            response = self.client.get(reverse('ipam:hosts', args=(subnet.id,)))
+            self.assertIsNone(response.data['next'])
+            self.assertIsNone(response.data['previous'])
+        except ValueError as err:
+            self.fail(f'subnet/32: {err}')