Remove requirement to pass channels in pubnub.add_channels_to_push

Author: Sebastian Molenda

pubnub/pubnub_core.py

@@ -629,7 +629,7 @@ def list_push_channels(self, device_id: str = None, push_type: PNPushType = None
         """
         return ListPushProvisions(self, device_id=device_id, push_type=push_type, topic=topic, environment=environment)
 
-    def add_channels_to_push(self, channels: Union[str, List[str]], device_id: str = None,
+    def add_channels_to_push(self, channels: Union[str, List[str]] = None, device_id: str = None,
                              push_type: PNPushType = None, topic: str = None,
                              environment: PNPushEnvironment = None) -> AddChannelsToPush:
         """Register channels for push notifications.

tests/functional/push/test_add_channels_to_push.py

@@ -10,8 +10,9 @@
 import pubnub.enums
 
 from pubnub.endpoints.push.add_channels_to_push import AddChannelsToPush
-from tests.helper import pnconf, sdk_name
+from tests.helper import pnconf, pnconf_env_copy, sdk_name
 from pubnub.managers import TelemetryManager
+from pubnub.enums import PNPushType, PNPushEnvironment
 
 
 class TestAddChannelsFromPush(unittest.TestCase):
@@ -89,3 +90,15 @@ def test_push_add_single_channel_apns2(self):
         })
 
         self.assertEqual(self.add_channels._channels, ['ch'])
+
+    def test_add_channels_to_push_builder(self):
+        config = pnconf_env_copy()
+        pubnub = PubNub(config)
+        endpoint = pubnub.add_channels_to_push() \
+            .channels(['ch1', 'ch2']) \
+            .device_id("00000000000000000000000000000000") \
+            .push_type(PNPushType.APNS2) \
+            .environment(PNPushEnvironment.PRODUCTION) \
+            .topic("testTopic")
+        result = endpoint.sync()
+        self.assertEqual(result.status.error, None)