Reducing Rails Testing Time

In those days where software tests are integrated in continuous integration cycles, it is a necessity that they run in a minimized amount of time. This article explains how through controlled memory usage, increased parallelism, transactional factory invocation, pragmatically judicious test refactoring and a few miscellaneous extras, it was possible to reduce the time needed to run the tests of a ruby on rails application in continuous-integration environments by a factor of ten.