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This is the premier (okay the only) unit testing framework for Bourne derived shells that I know about.
Latest News
Version 1.4 Released22 Mar 2008
ShUnit can now detect test functions automatically.
Version 1.3 Released15 Jan 2005
I've released a new version of ShUnit that has been successfully ported to all machines in the sourceforge compile farm (well, at lest the ones that are up and running anyway). Everything is pure Bourne shell now.