The term unit testing refers to the individual testing of separate units of a software system. In object-oriented systems, these units typically are classes and methods. Thus, in our context, unit testing refers to the individual testing of methods and classes in BlueJ.

This tutorial discusses BlueJ’s tools for systematic unit testing. If you are familiar withBlueJ’s interaction features, then you know that it is easy in BlueJ to test individual methods interactively. We refer to this as ad-hoc testing.