• Make sure that you have LTP installed, for Ubuntu:
  • sudo apt-get install ltp
  • sudo apt-get install lcov

• Checkout or download PHP53 into directory of your choice (in my case /home/zoe/BUILDS/php53_dev)
• cd /home/zoe/BUILDS/php53_dev
• ./buildconf
• ./configure --enable-gcov
• make

• make a new directory somewhere (eg /home/zoe/TESTS/coverage) and cd to it
• create a script (run_coverage) file to run the tests, eg

export TEST_PHP_EXECUTABLE=/home/zoe/BUILDS/php53_dev/sapi/cli/php
$TEST_PHP_EXECUTABLE /home/zoe/BUILDS/php53_dev/run-tests.php /home/zoe/BUILDS/php53_dev/ext/dom

• ./run_coverage. This runs all the tests found under php53_dev/ext/dom
• lcov --directory /home/zoe/BUILDS/php53_dev/ext/dom -c -o dom.info
• genhtml dom.info -o dom_coverage. This will make a directory called dom_coverage with html coverage files in it.
• View the coverage files

For example - suppose I wanted to take all the tests which are there because of bug reports and just look at what the base test cases cover.

• cd /home/zoe/BUILDS/php53_dev/ext/dom
• find tests -name “bug*.phpt” | xargs -i mv {} {}.bak ( Copies all the tests to test.phpt.bak )
• make clean; make
• cd /home/zoe/TESTS/coverage; ./runcov.sh run
• run lcov and genhtml as above

Just for interest, the code coverage of the dom extension without the bug tests is 2101 of 4708 lines (44.6%).

Don't forget to copy the bug tests back afterwards:

• find tests -name “bug*.phpt.bak” | sed 's/.bak/ /' | xargs -i mv {}.bak {}
• NB: no space between the two slashes after .bak