diff --git a/tests/manager/celery/tasks/test_marc.py b/tests/manager/celery/tasks/test_marc.py
index f3ccc40ee..9516b6e9c 100644
--- a/tests/manager/celery/tasks/test_marc.py
+++ b/tests/manager/celery/tasks/test_marc.py
@@ -180,6 +180,7 @@ def export_collection(self, collection: Collection, delta: bool = False) -> None
         ).wait()
 
     def redis_lock(self, collection: Collection, delta: bool = False) -> RedisLock:
+        assert collection.id is not None
         return marc_export_collection_lock(
             self.redis_fixture.client, collection.id, delta=delta
         )
@@ -270,12 +271,15 @@ def test_normal_run(
         marc_files = marc_export_collection_fixture.marc_files()
         assert len(marc_files) == 4
         delta_marc_files = [
-            marc_file for marc_file in marc_files if "delta" in marc_file.key
+            marc_file
+            for marc_file in marc_files
+            if marc_file.key and "delta" in marc_file.key
         ]
         assert len(delta_marc_files) == 2
 
         # Verify that the marc files contain the expected works.
         for marc_file in delta_marc_files:
+            assert marc_file.key is not None
             data = s3_service_integration_fixture.get_object("public", marc_file.key)
             records = list(MARCReader(data))
             assert len(records) == 2
diff --git a/tests/manager/marc/test_exporter.py b/tests/manager/marc/test_exporter.py
index 76a0b1b4b..cde6c8693 100644
--- a/tests/manager/marc/test_exporter.py
+++ b/tests/manager/marc/test_exporter.py
@@ -395,13 +395,13 @@ def test_process_work(self, marc_exporter_fixture: MarcExporterFixture) -> None:
         )
 
         # We get both libraries included in a full record
-        processed = process_work(False)
-        assert list(processed.keys()) == enabled_libraries
+        processed_works = process_work(False)
+        assert list(processed_works.keys()) == enabled_libraries
 
         # But we only get library1 in a delta record, since this is the first full marc export
         # for library2, so there is no timestamp to create a delta record against.
-        [processed] = process_work(True).keys()
-        assert processed.library_id == marc_exporter_fixture.library1.id
+        [processed_work] = process_work(True).keys()
+        assert processed_work.library_id == marc_exporter_fixture.library1.id
 
     def test_files_for_cleanup_deleted_disabled(
         self, marc_exporter_fixture: MarcExporterFixture