[UnitTests] Parametrized Unit Tests (#7)

* Initial RFC commit

* Update RFC with PR number and link to PR, now that the PR is open.

* [0007] Added reference to use of `copy.deepcopy`.

* [0007] Removed changes to .gitignore

Following comments, I agree that it doesn't belong in this PR, and may
include in a separate PR.

* [0007] Updated per @areusch's suggestions.