DejaGnu is a framework for testing other programs. Its purpose is to
provide a single front end for all tests.  Beyond this, DejaGnu offers
several advantages for testing:

(1) The flexibility and consistency of the DejaGnu framework make it
easy to write tests for any program.

(2) DejaGnu provides a layer of abstraction which makes all tests (if
correctly written) portable to any host or target where a program must
be tested.  For instance, a test for GDB can run (from any Unix based
host) on any target architecture supported by DejaGnu. Currently
DejaGnu runs tests on several single board computers, whose operating
software ranges from just a boot monitor to a full-fledged, Unix-like
realtime OS.

(3) DejaGnu is written in expect, which in turn uses Tcl (Tool command
language).  The framework comprises two parts: the testing framework
and the testsuites themselves. Tests are usually written in expect
using Tcl.

Both tcl and expect are provided with dejagnu.

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