Yeah, but it is also quite easy to implement a Test::More like testsuite in C with libtab (http://jc.ngo.org.uk/trac-bin/trac.cgi/wiki/LibTap). This library is pretty small, so you can ship it with your program. I just added a 't' directory in my autoconf based project and put the libtab header and sources there. Tests look pretty much the same as in Perl:
A simple t/Makefile.am could look like this:
* A simple example of a test.
ok(1 + 1 == 2, "Basic arithmetic works");
return exit_status(); /* Return the correct exit code */
Then add 't' in your main Makefile.am:
check_PROGRAMS = simple_tests
simple_tests_SOURCES = simple_tests.c tap.c ../src/something.c\
simple_tests_CFLAGS = -Wall --pedantic -std=c99 -I ../src
TESTS = simple_tests
Then you can run the tests with 'make check'.
SUBDIRS = src t