MADS - digitaltwin core module tests

[LukeParky]

This is a continuation of work done by MADs students. Opening a PR to investigate getting this into the core upstream repo.

Original PR: GeospatialResearch#2

Blocked by: #159 - I expect linting errors to occur

[LukeParky]

Automated tests not working from fork, so creating a new PR #178 to continue this work
Edit: Reopened because tests are running

[LukeParky]

Hi @caseyli92, before I finish my review, I want to check it over with your new linting. I'm going to block this against your linting issue

[github-actions]

Status: Ready to merge ✔️

Issues blocking this PR:

• Add additional more strict python linting rules for documentation #159 ✔️

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This comment was automatically written by the Blocking Issues bot, and this PR will be monitored for further progress.