Add unit tests for types

**Description**
Currently models lacks proper search support.

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

**Priority**: Low/Medium

The issue names no files or test entry points. Start by locating the models code and its existing unit-test conventions, then determine how search is currently handled and where configurable defaults belong. Done means model search has sensible defaults, supports configuration, and is covered by focused unit tests.

Written by the indexing model from the issue text.