Add firewalls test

Author: lgarber-akamai

test/unit/objects/linode_interface_test.py

@@ -247,3 +247,17 @@ def test_delete(self):
         with self.mock_delete() as m:
             iface.delete()
             assert m.called
+
+    def test_firewalls(self):
+        iface = LinodeInterface(self.client, 123, 124)
+
+        firewalls = iface.firewalls()
+
+        assert len(firewalls) == 1
+
+        assert firewalls[0].id == 123
+
+        # Check a few fields to make sure the Firewall object was populated
+        assert firewalls[0].label == "firewall123"
+        assert firewalls[0].rules.inbound[0].action == "ACCEPT"
+        assert firewalls[0].status == "enabled"