Add unit tests for store

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

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

**Priority**: Low/Medium

Start by locating the controllers and store mentioned in the issue, then inspect how search is currently handled and where unit tests for the store live. Define configurable search behavior with sensible defaults and add tests that demonstrate the supported search cases and defaults.

Written by the indexing model from the issue text.