fix flaky test that only is flaky on postgres

bin/recreate_db

@@ -29,10 +29,10 @@ if [[ "${1:-}" == "clean" ]]; then
   if [[ "${SPIFF_DATABASE_TYPE:-}" == "postgres" ]]; then
     if ! docker exec -it postgres-spiff psql -U spiffworkflow_backend spiffworkflow_backend_testing -c "select 1"; then
       docker run --name postgres-spiff -p 5432:5432 -e POSTGRES_PASSWORD=spiffworkflow_backend -e POSTGRES_USER=spiffworkflow_backend -e POSTGRES_DB=spiffworkflow_backend_testing -d postgres
-
       sleep 4 # classy
-
-      # create other db
+    fi
+    if ! docker exec -it postgres-spiff psql -U spiffworkflow_backend spiffworkflow_backend_development -c "select 1"; then
+      # create other db. spiffworkflow_backend_testing came with the docker run.
       docker exec -it postgres-spiff psql -U spiffworkflow_backend spiffworkflow_backend_testing -c "create database spiffworkflow_backend_development;"
     fi
   fi

tests/spiffworkflow_backend/unit/test_message_service.py

@@ -188,8 +188,10 @@ class TestMessageService(BaseTest):
         process_instance_result = ProcessInstanceModel.query.all()
 
         assert len(process_instance_result) == 3
-        process_instance_receiver_one = process_instance_result[1]
-        process_instance_receiver_two = process_instance_result[2]
+        process_instance_receiver_one = ProcessInstanceModel.query.filter_by(process_model_identifier='message_receiver_one').first()
+        assert process_instance_receiver_one is not None
+        process_instance_receiver_two = ProcessInstanceModel.query.filter_by(process_model_identifier='message_receiver_two').first()
+        assert process_instance_receiver_two is not None
 
         # just make sure it's a different process instance
         assert (