Add unit tests for types

**Problem**
When working with components, 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 no files, tests, or entry points. Start by locating the component type handling and existing unit-test structure, then identify how errors are currently produced. Done means the relevant behavior has unit coverage and error messages are more descriptive for debugging.

Written by the indexing model from the issue text.