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><H1
><A
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></A
>Overview</H1
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="WHATIS"
></A
>What is DejaGnu ?</H1
><P
><SPAN
CLASS="PRODUCTNAME"
>DejaGnu</SPAN
> 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
<I
CLASS="EMPHASIS"
>Test Harness</I
> 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
<SPAN
CLASS="PRODUCTNAME"
>Expect</SPAN
>, which in turn uses
<SPAN
CLASS="PRODUCTNAME"
>Tcl</SPAN
> -- Tool command
language. There is more information on Tcl at the <A
HREF="http://www.scriptics.com"
TARGET="_top"
>Scriptics</A
> web site and the
Expect web site is at <A
HREF="http://expect.nist.gov"
TARGET="_top"
>NIST</A
>.</P
><P
>Julia Menapace first coined the term ``DejaGnu'' to describe
an earlier testing framework at Cygnus Support she had written
for <B
CLASS="COMMAND"
>GDB</B
>. When we replaced it with the
Expect-based framework, it was like DejaGnu all over again.
More importantly, it was also named after my daughter, <A
HREF="mailto:deja@welcomehome.org"
TARGET="_top"
>Deja Snow Savoye</A
>
(now 13 years old as of September 2003), who was a toddler
during DejaGnu's beginnings.</P
><P
>DejaGnu offers several advantages for testing:</P
><P
></P
><UL
COMPACT="COMPACT"
><LI
STYLE="list-style-type: disc"
><P
>The flexibility and consistency of the DejaGnu
framework make it easy to write tests for any program, with
either batch oriented, or interactive programs.</P
></LI
><LI
STYLE="list-style-type: disc"
><P
>DejaGnu provides a layer of abstraction which
allows you to write tests that are portable to any host or
target where a program must be tested. For instance, a test
for <B
CLASS="COMMAND"
>GDB</B
> can run from any supported host
system on any supported target system. DejaGnu runs tests on
many single board computers, whose operating software ranges
from a simple boot monitor to a real-time OS.</P
></LI
><LI
STYLE="list-style-type: disc"
><P
>All tests have the same output format. This
makes it easy to integrate testing into other software
development processes. DejaGnu's output is designed to be
parsed by other filtering script and it is also human
readable.</P
></LI
><LI
STYLE="list-style-type: disc"
><P
>Using Tcl and Expect, it's easy to create wrappers
for existing testsuites. By incorporating existing tests under
DejaGnu, it's easier to have a single set of report analyse
programs..</P
></LI
></UL
><P
>Running tests requires two things: the testing framework and
the testsuites themselves. Tests are usually written in
<SPAN
CLASS="PRODUCTNAME"
>Expect</SPAN
> using Tcl, but you can also use
a Tcl script to run a testsuite that is not based on
<SPAN
CLASS="PRODUCTNAME"
>Expect</SPAN
>. <SPAN
CLASS="PRODUCTNAME"
>Expect</SPAN
>
script filenames conventionally use <I
CLASS="EMPHASIS"
>.exp</I
> as a
suffix; for example, the main implementation of the DejaGnu test
driver is in the file
<SPAN
CLASS="PRODUCTNAME"
>runtest.exp</SPAN
>.)</P
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