Deploy Script: Add Unit Tests

[LilithCole]

As a developer, I would like the deploy script to be tested, so that we can catch potential issues before we start actual deployments. See #8201 and #8203. This ticket is just to setup the framework and possibly some small proof of concept tests

Acceptance Criteria

• Unit testing framework is available for the deploy script

How to Test

verbose instructions for reviewer to test changes
(Add before making a PR)

[esmith1729]

Going to look into different possibilities of unit testing frameworks on batch files: something like this: https://stackoverflow.com/questions/6612415/is-there-a-unit-test-framework-for-windows-batch-files