I also ran some coverage tests recently to try and work out how much of a difference we were making overall. This turned out to be far more problematic than I had thought it would be. The main issue was one that Felix had already found, ccache and lcov do not coexist happily. It turns out that there is a check for this in the php configure script - but unfortunately the debian way of installing ccache is simply to link it to gcc, which by-passes the check in configure. Oh well.
The before TestFest coverage data shows an overall line coverage of 70.4%, a run from the 28th May shows a line coverage of 72.3% in total. There are minor differences in the number of lines but I think this is to be expected. It's interesting to look at the areas where I know groups have been concentrating their efforts - for example the line coverage of ext/ldap has increased 8.5% to 89.1%! Check curl, date, dom, ftp, gettext, intl, posix, reflection, sockets, spl, sqlite3, xmlwriter and xsl for other TestFest related increases in coverage.
I'll rerun the coverage tests regularly in future. I should perhaps mention that I know that ext/imap statistics are missing and that's because we don't yet have the ability to run the ext/imap tests on the system that is being used for TestFest. I will fix this in the next week or so - if you see anything else that doesn't look right please email me and I'll fix it, or better still, email php-qa@lists.php.net :-)
