There are gems like shoulda (https://github.com/thoughtbot/shoulda https://github.com/thoughtbot/shoulda) that make it really easy to do the 'types and typos' k

There are gems like shoulda (https://github.com/thoughtbot/shoulda https://github.com/thoughtbot/shoulda) that make it really easy to do the 'types and typos' kind of unit tests. The marginal time required for any given class is negligible.