Add unit tests for utils

**Description**
Currently core lacks proper export support.

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

**Priority**: Low/Medium

The issue mentions core utils but names no file, test, or entry point. First locate the core utility code and existing unit-test conventions, then clarify what “export” means and which defaults are required. Done should include unit tests and configurable export behavior with sensible defaults.

Written by the indexing model from the issue text.