DejaGnu is a framework for testing other programs. Its purpose is
to provide a single front end for all tests. Think of it as a custom
library of Tcl procedures crafted to support writing a test harness. A
test harness is the testing infrastructure that is created to support
a specific program or tool. Each program can have multiple testsuites,
all supported by a single test harness. DejaGnu is written in Expect,
which in turn uses Tcl -- Tool command language.