Feature: backfill top level unit tests

[jpmcb]

Suggested solution

We should have a some sanity tests that execute the command run functions to ensure the help is being outputted correctly and there aren't any major bugs preventing the CLI from running properly (like incorrectly named / put together flags)

Related: #126

[nickytonline]

Have to sort something else out first. Will get back on this unless someone else picks it up first.