What do tests tell us ?

Back in September 2012, I gave a talk at Dev’s in the Ditch on what tests tell us.  The talk resonated with a post by Matt Wynne today on fixing slow builds.

Optimising a slow build ? You are solving the wrong problem.

Slow builds and test suites with a large number of tests are an architecture smell. An indicator that there is something wrong with how you have built the application. I covered a few other things that tests or the lack of them tell us, in my talk.