Add unit tests for api

**Feature request**
It would be great to have logging for utils.

**Use case**
Many users need this functionality for production deployments.

**Implementation idea**
Add a new config option `enable_logging` with default `false`.

Start by locating the API utilities and the unit-test entry points, then inspect how configuration options are defined. Clarify whether the requested work is tests for the API or logging for utilities; done should include a documented enable_logging option defaulting to false and tests covering the requested behavior.

Written by the indexing model from the issue text.