Error Modeling and Unit Testing for Modules

[christopherkeim]

Description

These changes collectively implement error modeling with enums and unit tests for the hmtl, markdown, and files modules.

Motivation and Context

This adds error modeling and unit testing examples to the template.

Testing

Unit tests are included in each module within a tests submodule.

This template does not implement integration testing, which is idiomatically included in a tests directory at the same level as src.

Dependencies Added:

Development Dependencies

• tempfile = "3.10.1"

Dependencies Removed:

None

Types of changes

• Documentation (non-breaking change which improves documentation)
• Refactoring / Cleanup (non-breaking change which does not add functionality or fix issues)

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly (or no changes needed).
• I have added tests to cover my changes (or no new test are needed).
• All new and existing tests are passing.