Set up tests with a multi-module Gradle repository

# Task Description

This needs to be tested more thoroughly with a mutli-module Gradle project.

# Open Questions

# Notes

# Task List

The following tasks will need to be carried out:
* [ ] Investigate the issue.
* [ ] Provide a solution.
* [ ] Test the fix.
* [ ] Update the documentation.

# Useful Commands

# Incurred Costs

# Task Relationships

This task:
* Is a sub-task of:
* Depends on:
* Is a follow-up of:
* Relates to:
* #10

# Resources

# Useful Links

* [Idempotence: Documentation](https://carlspring.github.io/idempotence/)

# Points of Contact

* @carlspring

Start by reviewing the repository's current Gradle and test setup, along with related issue #10. Done means providing thorough tests for a multi-module Gradle project, testing the fix, and updating the documentation.

Written by the indexing model from the issue text.