Write unit tests for publish public package

[james-garriss]

💡 Summary

Convert the code in the publish public package workflow into functions and write unit tests for them.

Motivation and context

Unit tests are good.

Implementation notes

Please provide details for implementation, such as:

• Create function.
• Write Pester tests
• Test the tests.

Acceptance criteria

How do we know when this work is done?

• The functions have good tests.