Add unit tests for lib

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

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

**Priority**: Low/Medium

Inspect the lib directory and trace the current validation path to understand how search is handled. Add configurable search with sensible defaults and unit tests covering the new behavior; done means validation supports the requested search configuration and the tests pass.

Written by the indexing model from the issue text.