conditional tests

src/plone/restapi/serializer/summary.py

@@ -83,10 +83,7 @@ def __init__(self, context, request):
         self.blocklisted_attributes = metadata["blocklisted_attributes"]
 
     def __call__(self):
-        try:
-            obj = IContentListingObject(self.context)
-        except TypeError:
-            return {}
+        obj = IContentListingObject(self.context)
 
         summary = {}
         for field in self.metadata_fields():

src/plone/restapi/tests/test_serializer_summary.py

@@ -18,6 +18,13 @@
 
 import Missing
 import unittest
+import pkg_resources
+
+
+try:
+    from plone.app.event.adapters import OccurrenceContentListingObject
+except ImportError:
+    OccurrenceContentListingObject = None
 
 
 class TestSummarySerializers(unittest.TestCase):
@@ -245,7 +252,24 @@ def setUp(self):
     def tearDown(self):
         popGlobalRegistry(getSite())
 
-    def test_dx_event_with_recurrence(self):
+    @unittest.skipIf(
+        OccurrenceContentListingObject is not None,
+        "this test needs a plone.app.event version that does not include a IContentListingObject adapter",
+    )
+    def test_dx_event_with_recurrence_old_version(self):
+        tomorrow = datetime.now() + timedelta(days=1)
+        tomorrow_str = tomorrow.strftime("%Y-%m-%d")
+        ot = OccurrenceTraverser(self.event, self.request)
+        ocurrence = ot.publishTraverse(self.request, tomorrow_str)
+
+        with self.assertRaises(TypeError):
+            getMultiAdapter((ocurrence, self.request), ISerializeToJsonSummary)()
+
+    @unittest.skipIf(
+        OccurrenceContentListingObject is None,
+        "this test needs a plone.app.event version that includes a IContentListingObject adapter",
+    )
+    def test_dx_event_with_recurrence_new_version(self):
         tomorrow = datetime.now() + timedelta(days=1)
         tomorrow_str = tomorrow.strftime("%Y-%m-%d")
         ot = OccurrenceTraverser(self.event, self.request)