Add unit tests for components

**Problem**
When working with types, 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 does not name any files, components, types, or existing tests. Start by locating type handling and the current unit-test structure, then identify the error paths covered by the issue. Done means the relevant behavior has unit tests and the resulting errors provide more descriptive messages.

Written by the indexing model from the issue text.