So you're unit testing, and perhaps even practicing Test Driven Development (TDD). Congratulations! You're likely better than at least half of your peers! There is just one thing you cannot figure out. How am I supposed to just test one thing when my code has dependencies? Enter Mocking!
Or any version that you would like to install.
Learn the basics (and some hacks) of sales and marketing by reviewing the slide deck I shared with a group of small and medium-sized business owners recently at Layton City. I added content to each slide, so you should be able to follow along without having attended.