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NAME="DESIGNGOALS"
>Design Goals</A
></H1
><P
>DejaGnu grew out of the internal needs of Cygnus Solutions. (then
Cygnus Support). Cygnus maintained and enhanced a variety of free
programs in many different environments, and we needed a testing
tool that:</P
><P
></P
><UL
><LI
STYLE="list-style-type: disc"
><P
>was useful to developers while fixing
bugs.</P
></LI
><LI
STYLE="list-style-type: disc"
><P
>automated running many tests during a software
release process.</P
></LI
><LI
STYLE="list-style-type: disc"
><P
>was portable among a variety of host
computers.</P
></LI
><LI
STYLE="list-style-type: disc"
><P
>supported cross-development
testing.</P
></LI
><LI
STYLE="list-style-type: disc"
><P
>permitted testing interactive programs, like
<B
CLASS="COMMAND"
>GDB</B
>; and </P
></LI
><LI
STYLE="list-style-type: disc"
><P
>permitted testing batch oriented programs, like
<B
CLASS="COMMAND"
>GCC</B
>.</P
></LI
></UL
><P
>Some of the requirements proved challenging. For example,
interactive programs do not lend themselves very well to automated testing.
But all the requirements are important: for instance, it is imperative to
make sure that <B
CLASS="COMMAND"
>GDB</B
> works as well when cross-debugging
as it does in a native configuration. </P
><P
>Probably the greatest challenge was testing in a cross-development
environment (which can be a real nightmare). Most cross-development
environments are customized by each developer. Even when buying packaged
boards from vendors there are many differences. The communication
interfaces vary from a serial line to ethernet. DejaGnu was designed with
a modular communication setup, so that each kind of communication can be
added as required, and supported thereafter. Once a communication
procedure is coded, any test can use it. Currently DejaGnu can use
<B
CLASS="COMMAND"
>rsh</B
>, <B
CLASS="COMMAND"
>rlogin</B
>,
<B
CLASS="COMMAND"
>telnet</B
>, <B
CLASS="COMMAND"
>tip</B
>,
<B
CLASS="COMMAND"
>kermit</B
>, and <B
CLASS="COMMAND"
>mondfe</B
> for remote
communications.</P
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