A detailed documentation is found in my OODPScript.pdf
Ask for Workshops and Scripts at http://www.gerdhirsch.de/SeminarOOAnalyseUML.html

This Framework is based on the Design Pattern of the GoF
called Command Pattern
UndoRedoManager is Invoker
it establishes the possibility to track modifications UndoRedoManager extends UndoRedoStack
UndoRedoStack is the common infrastructure for UndoRedoManager and CompositeCommand

There is also a CompositeCommand for user defined sequences of commands, called makros and programmable multiple Commands

Tests are provided in package de.gerdhirsch.undoredo.test using hamcrest assertThat(..) for UndoRedoStack, UndoRedoManager and CompositeCommand
and are usage examples based on a simple Calculator and Plus and Minus Commands
Common Test Base is class UndoRedoTest

read http://www.vogella.com/tutorials/Hamcrest/article.html#hamcrestoverview