fix: prevent error when addons is null

api/organisations/chargebee/chargebee.py

@@ -190,8 +190,7 @@ def _convert_chargebee_subscription_to_dictionary(
 ) -> dict:
     chargebee_subscription_dict = vars(chargebee_subscription)
     # convert the addons into a list of dictionaries since vars don't do it recursively
-    chargebee_subscription_dict["addons"] = [
-        vars(addon) for addon in chargebee_subscription.addons
-    ]
+    addons = chargebee_subscription.addons or []
+    chargebee_subscription_dict["addons"] = [vars(addon) for addon in addons]
 
     return chargebee_subscription_dict

api/tests/unit/organisations/chargebee/conftest.py

@@ -1,3 +1,5 @@
+import typing
+
 import pytest
 from pytest_mock import MockerFixture
 from tests.unit.organisations.chargebee.test_unit_chargebee_chargebee import (
@@ -7,6 +9,14 @@
 
 from organisations.chargebee.metadata import ChargebeeObjMetadata
 
+ChargebeeCacheMocker = typing.Callable[
+    [
+        typing.Optional[dict[str, ChargebeeObjMetadata]],
+        typing.Optional[dict[str, ChargebeeObjMetadata]],
+    ],
+    None,
+]
+
 
 @pytest.fixture
 def chargebee_object_metadata():
@@ -17,6 +27,36 @@ def chargebee_object_metadata():
 def mock_subscription_response(
     mocker: MockerFixture,
     chargebee_object_metadata: ChargebeeObjMetadata,
+    chargebee_cache_mocker: ChargebeeCacheMocker,
+) -> MockChargeBeeSubscriptionResponse:
+    # Given
+    plan_id = "plan-id"
+    subscription_id = "subscription-id"
+    customer_email = "[email protected]"
+
+    # Let's create a (mocked) subscription object
+    mock_subscription_response = MockChargeBeeSubscriptionResponse(
+        subscription_id=subscription_id,
+        plan_id=plan_id,
+        customer_email=customer_email,
+        addons=None,
+    )
+    mocked_chargebee = mocker.patch("organisations.chargebee.chargebee.chargebee")
+
+    # tie that subscription object to the mocked chargebee object
+    mocked_chargebee.Subscription.retrieve.return_value = mock_subscription_response
+
+    # now, let's mock chargebee cache object
+    chargebee_cache_mocker({plan_id: chargebee_object_metadata}, None)
+
+    return mock_subscription_response
+
+
+@pytest.fixture
+def mock_subscription_response_with_addons(
+    mocker: MockerFixture,
+    chargebee_object_metadata: ChargebeeObjMetadata,
+    chargebee_cache_mocker: ChargebeeCacheMocker,
 ) -> MockChargeBeeSubscriptionResponse:
     # Given
     plan_id = "plan-id"
@@ -37,10 +77,27 @@ def mock_subscription_response(
     mocked_chargebee.Subscription.retrieve.return_value = mock_subscription_response
 
     # now, let's mock chargebee cache object
-    mocked_chargebee_cache = mocker.patch(
-        "organisations.chargebee.chargebee.ChargebeeCache", autospec=True
+    chargebee_cache_mocker(
+        {plan_id: chargebee_object_metadata}, {addon_id: chargebee_object_metadata}
     )
-    mocked_chargebee_cache.return_value.plans = {plan_id: chargebee_object_metadata}
-    mocked_chargebee_cache.return_value.addons = {addon_id: chargebee_object_metadata}
 
     return mock_subscription_response
+
+
+@pytest.fixture()
+def chargebee_cache_mocker(
+    mocker,
+) -> typing.Callable[
+    [dict[str, ChargebeeObjMetadata], dict[str, ChargebeeObjMetadata]], None
+]:
+    def mock_chargebee_cache(
+        plans_data: dict[str, ChargebeeObjMetadata] = None,
+        addons_data: dict[str, ChargebeeObjMetadata] = None,
+    ) -> None:
+        mocked_chargebee_cache = mocker.patch(
+            "organisations.chargebee.chargebee.ChargebeeCache", autospec=True
+        )
+        mocked_chargebee_cache.return_value.plans = plans_data or {}
+        mocked_chargebee_cache.return_value.addons = addons_data or {}
+
+    return mock_chargebee_cache

api/tests/unit/organisations/chargebee/test_unit_chargebee_chargebee.py

@@ -263,7 +263,8 @@ def test_get_hosted_page_url_for_subscription_upgrade(self):
 
 
 def test_extract_subscription_metadata(
-    mock_subscription_response, chargebee_object_metadata: ChargebeeObjMetadata
+    mock_subscription_response_with_addons,
+    chargebee_object_metadata: ChargebeeObjMetadata,
 ):
     # Given
     status = "status"
@@ -300,7 +301,8 @@ def test_extract_subscription_metadata(
 
 
 def test_extract_subscription_metadata_when_addon_list_is_empty(
-    mock_subscription_response, chargebee_object_metadata: ChargebeeObjMetadata
+    mock_subscription_response_with_addons,
+    chargebee_object_metadata: ChargebeeObjMetadata,
 ):
     # Given
     status = "status"
@@ -329,16 +331,19 @@ def test_extract_subscription_metadata_when_addon_list_is_empty(
 
 
 def test_get_subscription_metadata_from_id(
-    mock_subscription_response, chargebee_object_metadata: ChargebeeObjMetadata
+    mock_subscription_response_with_addons: MockChargeBeeSubscriptionResponse,
+    chargebee_object_metadata: ChargebeeObjMetadata,
 ):
     # Given
     customer_email = "[email protected]"
-    subscription_id = mock_subscription_response.subscription.id
+    subscription_id = mock_subscription_response_with_addons.subscription.id
 
     # When
     subscription_metadata = get_subscription_metadata_from_id(subscription_id)
 
     # Then
+    # Values here are multiplied by 2 because the both the plan and the addon included in
+    # the mock_subscription_response_with_addons fixture contain the same values.
     assert subscription_metadata.seats == chargebee_object_metadata.seats * 2
     assert subscription_metadata.api_calls == chargebee_object_metadata.api_calls * 2
     assert subscription_metadata.projects == chargebee_object_metadata.projects * 2
@@ -425,6 +430,23 @@ def test_get_subscription_metadata_from_id_returns_none_for_invalid_subscription
     assert subscription_metadata is None
 
 
+def test_get_subscription_metadata_from_id_returns_valid_metadata_if_addons_is_none(
+    mock_subscription_response: MockChargeBeeSubscriptionResponse,
+    chargebee_object_metadata: ChargebeeObjMetadata,
+) -> None:
+    # Given
+    mock_subscription_response.addons = None
+    subscription_id = mock_subscription_response.subscription.id
+
+    # When
+    subscription_metadata = get_subscription_metadata_from_id(subscription_id)
+
+    # Then
+    assert subscription_metadata.seats == chargebee_object_metadata.seats
+    assert subscription_metadata.api_calls == chargebee_object_metadata.api_calls
+    assert subscription_metadata.projects == chargebee_object_metadata.projects
+
+
 def test_add_single_seat_with_existing_addon(mocker):
     # Given
     plan_id = "plan-id"