DejaGnu is designed to run on POSIX compliant systems and is compliant with the POSIX 1003.3 standard for test frameworks. It comprises a command to run tests (runtest), a language in which to write tests (expect), a standard directory structure for the tests and a set of configuration files.

	Note
	DejaGnu is not installed by default on most Linux systems. However most systems provide it as a standard extra. If not, it can be downloaded from www.gnu.org/software/dejagnu.