In the previous part of this series, we discussed the main pieces needed for a proper development environment. However, there are other, smaller pieces, scripts, subsystems and other very important components of a properly-configured development environment that don't fit in the acronym.

This second part of the series looks at the "T" in DTAP - testing. It mentions unit testing, integration testing and regression testing. He also touches briefly on "refresh scripts" to handle data updates or pushes out to another stage of the process.

There are four primary systems that need to be set up and isolated. And they are described by the acronym DTAP-Development, Testing, Acceptance, and Production. One thing that has changed recently, though, is that these systems no longer have to mean separate hardware.

He gives an overview of each, setting out definitions to be used for the rest of the series with the next part discussing some of the "smaller moving pieces" of the process.