I completely understand the concern here. If every change required an 8 minute wait it would be real sad for us.

We use a tool called `rake autospec` at Discourse which is a smart test runner. I personally like the vim integration we built.

The way it works...

1. Run `bin/rake autospec` in a terminal 2. I head to the code I want to change, I change the code 3. The spec runner figures out what the right test is run and runs that. 4. While it is busy running specs at any time it can be interrupted by saving a "*.spec" file in which case the spec runner will run the spec at the cursor

This has worked wonderfully well for us.