diff --git a/applications/audit_generator/handler.py b/applications/audit_generator/handler.py
index 533f5d91..76f53538 100644
--- a/applications/audit_generator/handler.py
+++ b/applications/audit_generator/handler.py
@@ -15,11 +15,14 @@ from orchestration.audit_generator_orchestrator import AuditGeneratorOrchestrato
 from orchestration.audit_generator_unit_of_work import AuditGeneratorUnitOfWork
 from utilities.aws_lambda.subtask_handler import subtask_handler
 
+
 @subtask_handler()
 def handler(body: dict[str, Any], context: Any) -> None:
     trigger = AuditGeneratorTriggerRequest.model_validate(body)
 
-    boto3_client: Any = boto3.client  # pyright: ignore[reportUnknownMemberType, reportUnknownVariableType]
+    boto3_client: Any = (
+        boto3.client
+    )  # pyright: ignore[reportUnknownMemberType, reportUnknownVariableType]
     boto_s3: Any = boto3_client("s3")
     bucket = os.environ["S3_BUCKET_NAME"]
     s3_client = S3Client(boto_s3_client=boto_s3, bucket=bucket)
diff --git a/pytest.ini b/pytest.ini
index 2bcd6178..cb6af047 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -25,5 +25,6 @@ testpaths =
     etl/epc_clean/tests
     etl/hubspot/tests
     etl/spatial/tests
+    tests/
 markers =
     integration: mark a test as an integration test
diff --git a/tests/utilities/aws_lambda/test_subtask_handler.py b/tests/utilities/aws_lambda/test_subtask_handler.py
index d671adc4..3b33d7fd 100644
--- a/tests/utilities/aws_lambda/test_subtask_handler.py
+++ b/tests/utilities/aws_lambda/test_subtask_handler.py
@@ -228,6 +228,25 @@ def test_subtask_handler_records_cloudwatch_url_on_subtask(
     assert "$255B$2524LATEST$255D" in saved_url
 
 
+def test_subtask_handler_completes_subtask_without_orchestrator_parameter(
+    harness: Harness,
+) -> None:
+    # arrange
+    task, subtask = harness.orchestrator.create_task_with_subtask(
+        task_source="manual:test"
+    )
+
+    @subtask_handler(orchestrator_cm=harness.factory)
+    def handler(body: dict[str, Any], context: Any) -> None:
+        return None
+
+    # act
+    handler(_direct_event(task.id, subtask.id), context=None)
+
+    # assert
+    assert harness.subtasks.get(subtask.id).status is SubTaskStatus.COMPLETE
+
+
 def test_subtask_handler_leaves_cloudwatch_url_unset_outside_lambda(
     harness: Harness, monkeypatch: pytest.MonkeyPatch
 ) -> None: