Add unit tests for routes

**Description**
Currently validation lacks proper notifications support.

**Proposed solution**
Add configurable notifications with sensible defaults.

**Priority**: Low/Medium

Start by locating the route-validation code and the existing unit-test layout. Reconcile the title's request for route tests with the proposed configurable notifications, then confirm the required defaults and validation cases; done means the agreed behavior is covered by unit tests.

Written by the indexing model from the issue text.