Add unit tests for config

**Feature request**
It would be great to have notifications for parsers.

**Use case**
Many users need this functionality for production deployments.

**Implementation idea**
Add a new config option `enable_notifications` with default `false`.

The issue names parser configuration and notifications but no files or tests. Start by locating the parser configuration entry point and existing config unit tests; verify that enable_notifications defaults to false and clarify the notification behavior before considering the work complete.

Written by the indexing model from the issue text.