FitNesse

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FitNesse is a web server, a wiki, and a software testing tool. It is based on Ward Cunningham's Framework for Integrated Test. FitNesse is designed to support acceptance testing rather than unit testing in that it facilitates detailed readable description of system function.

FitNesse allows users of a developed system to enter specially formatted input (its format is accessible to non-programmers). This input is interpreted and tests are created automatically. These tests are then executed by the system and output is returned back to the user. The advantage of this approach is very fast feedback from users. The developer of the system to be tested needs to provide some support (classes named "fixtures", conforming to certain conventions).

FitNesse is written in Java (by Micah Martin, Robert C. Martin and Michael Feathers) but versions for several other languages had been added over time (C++, Python, Ruby, Delphi, C#, etc).