A fast, expressive, and contextual ruby unit testing framework. Protest the slow test. In contrast to other popular Ruby testing frameworks such as Test::Unit, Shoulda and RSpec, Riot does not run a setup and teardown sequence before and after each test. This speeds up test execution quite a bit, but also changes how you write your tests. In general and in my opinion, you should avoid mutating any objects under test and if you use Riot you're pretty much going to have to.