With the testbed API, a sample test case can be structured as follows:
@c* <lynX> Is there a way to pick a more readable font for this include?
-\lstset{language=C}
-\lstinputlisting{testbed_test.c}
+@example
+@verbatiminclude testbed_test.c
+@end example
The source code for the above listing can be found at
@uref{https://gnunet.org/git/gnunet.git/tree/doc/testbed_test.c}
or in the @file{doc/} folder of your repository check-out.