Add unit tests for hooks

**Problem**
When working with middleware, the error messages could be more descriptive.

**Suggestion**
Improve error handling and add detailed error messages.

**Context**
This would help with debugging and maintenance.

Start by locating the hooks and middleware implementation, then find any existing unit-test entry points for that behavior. Reproduce the current error path and define done as coverage for the hooks plus more descriptive middleware error messages.

Written by the indexing model from the issue text.