Add unit tests for hooks

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

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

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

The issue names hooks but no files or test entry points; begin by locating the hook implementation and the existing unit-test setup. Add coverage for the relevant error cases and make completion verifiable by checking that failures produce detailed, descriptive messages.

Written by the indexing model from the issue text.