Extreme Programming (sometimes abbreviated as XP), is a light-weight development methodology developed by Kent Beck. There are now several books about XP.

• http://www.extremeprogramming.org/
• http://www.xprogramming.com/

One aspect of Extreme Programming is Test Driven Design. This is supported by the xUnit family of test frameworks. (The first of which might have been SUnit[1], which supports testing with Smalltalk.)

Java has JUnit[2].

Tcl has tclunit. (Tcl's built-in tcltest framework is also eminently suitable for unit testing.)

See also XotclIDE.

The Portland Pattern Repository Wiki [3] has an extensive collection of pages on ExtremeProgramming [4].

See http://park.ruru.ne.jp/ando/work/tclTkUnit/ for TclTkUnit , a JUnit like testing framework.

TclTkUnit appears to be a dead project, software can be accessed at archive.org http://web.archive.org/web/20091009212801/http://park.ruru.ne.jp/ando/work/tclTkUnit/.

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