Various tests, particularly the client program tests under src/bin, use the Perl TAP tools and are run using the Perl testing program prove. You can pass command-line options to prove by setting the make variable PROVE_FLAGS, for example:
make -C src/bin check PROVE_FLAGS='--timer'
See the manual page of prove for more information.
The TAP tests require the Perl module IPC::Run. This module is available from CPAN or an operating system package.
If you see anything in the documentation that is not correct, does not match your experience with the particular feature or requires further clarification, please use this form to report a documentation issue.