Add unit tests for models

**Feature request**
It would be great to have pagination for parsers.

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

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

No files, tests, or parser entry points are named. Start by locating the parser configuration and existing model unit tests, then confirm the intended pagination behavior and verify that enable_pagination defaults to false and pagination works for production use cases.

Written by the indexing model from the issue text.