pkg-monitoring-plugins/lib/tests
..
var
config-dos.ini
config-opts.ini
config-tiny.ini
Makefile.am
Makefile.in
plugin.ini
plugins.ini
README
test_base64.c
test_base64.t
test_cmd.c
test_cmd.t
test_disk.c
test_disk.t
test_ini1.c
test_ini1.t
test_ini3.c
test_ini3.t
test_opts1.c
test_opts1.t
test_opts2.c
test_opts2.t
test_opts3.c
test_opts3.t
test_tcp.c
test_tcp.t
test_utils.c
test_utils.t

The tests in here use the libtap library functions 
(http://jc.ngo.org.uk/trac-bin/trac.cgi/wiki/LibTap), so are
more for unit testing the utils.c library functions. 

However, it probably should be merged into the plugins/t subdirectory.