Add unit tests for lib

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

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

**Priority**: Low/Medium

Start by inspecting the lib area and the models implementation to identify where timeout behavior belongs, then review the existing unit-test setup. Confirm the expected configurable interface and sensible defaults before making changes; done means model operations honor the timeout and tests cover the default and configured cases.

Written by the indexing model from the issue text.