allow process_status filter to be a csv string

src/spiffworkflow_backend/routes/process_api_blueprint.py

@@ -583,8 +583,9 @@ def process_instance_list(
             ProcessInstanceModel.end_in_seconds <= end_till
         )
     if process_status is not None:
+        process_status_array = process_status.split(",")
         process_instance_query = process_instance_query.filter(
-            ProcessInstanceModel.status == process_status
+            ProcessInstanceModel.status.in_(process_status_array)  # type: ignore
         )
 
     process_instances = process_instance_query.order_by(

src/spiffworkflow_backend/services/process_instance_processor.py

@@ -357,7 +357,7 @@ class ProcessInstanceProcessor:
     @staticmethod
     def __get_bpmn_process_instance(
         process_instance_model: ProcessInstanceModel,
-        spec: WorkflowSpec = None,
+        spec: Optional[WorkflowSpec] = None,
         validate_only: bool = False,
         subprocesses: Optional[IdToBpmnProcessSpecMapping] = None,
     ) -> BpmnWorkflow:

tests/spiffworkflow_backend/integration/test_process_api.py

@@ -1050,6 +1050,16 @@ class TestProcessApi(BaseTest):
             assert len(results) == 1
             assert results[0]["status"] == ProcessInstanceStatus[statuses[i]].value
 
+        response = client.get(
+            f"/v1.0/process-instances?process_status=not_started,complete&process_group_identifier={test_process_group_id}&process_model_identifier={test_process_model_id}",
+            headers=self.logged_in_headers(user),
+        )
+        assert response.json is not None
+        results = response.json["results"]
+        assert len(results) == 2
+        assert results[0]["status"] in ['complete', 'not_started']
+        assert results[1]["status"] in ['complete', 'not_started']
+
         # filter by start/end seconds
         # start > 1000 - this should eliminate the first
         response = client.get(