Add unit tests for lib

**Description**
Currently auth lacks proper import support.

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

**Priority**: Low/Medium

Start by inspecting the auth implementation under lib and the repository’s existing unit-test setup; the issue does not name a specific file or test entry point. Identify how imports currently work, then verify that configurable import behavior uses sensible defaults and is covered by unit tests.

Written by the indexing model from the issue text.