TestFest, which tests to focus on?

So, looking here: http://gcov.php.net/PHP_5_3/lcov_html/ It seems that I would probably want to focus on something with the least coverage (in red), correct? So, if I were to pick the ldap extension, for example: http://gcov.php.net/PHP_5_3/lcov_html/ldap/index.php I can see by clicking on ldap.c http://gcov.php.net/PHP_5_3/lcov_html/ldap/ldap.c.gcov.php The code that does not get covered (very cool, btw). So, is there a way that I can check to see if my test really does cover that code before submitting it for review? I'm assuming the answer is no. :-) Thanks, Tom