I love Go in part because they ship with a unit-test system. On the command-line, call 'gotest', and it compiles your stuff and runs your tests. And it's FAST, much faster than any other compiled language I've ever used before.
I also love Vim, for too many reasons to mention here.
I was looking for a way to get continuous testing as part of my development process. And then I remembered :map.
Now, every time I write my file out, I get glorious testing!!