proper tests for all functions

[juniperlsimonis]

the command line functions should all have tests
http://r-pkgs.had.co.nz/tests.html

[juniperlsimonis]

@ddalthorp can you tackle writing the tests for the command line functions? i'm working on all of the UI functions with the tidying up I'm doing.
the examples that are in the documentation actually provided a pretty good set of tests, they just need to be integrated into the testing structure like everything else.

[ddalthorp]

The vignettes provide a great test, especially if we read through them after significant changes, which I'm planning to do in the next day or so.

[juniperlsimonis]

Yes that's true, but the vignettes aren't proper unit tests.

[juniperlsimonis]

this is a really great overview of testing across a codebase: https://katyhuff.github.io/python-testing/