It took me considerable amount of time to figure out the correct file to edit in order to have Xdebug work from the command line with PHPUnit's --report flag. This flag generates HTML files that look something like the following image:
This displays the number of lines that have been run in the process of unit testing; and in a lovely readable format (see Xdebug's normal format to see how much more useful this is). To get PHPUnit and Xdebug working, start by following the tutorial in the previous article. Then to get Xdebug running, check out this post by Felx Geisendörfer. Follow steps 1 + 2. If you are using regular-old MAMP, 3 + 4 should get you going just fine. The problem I had was I am using MAMP Pro, so I was editing my "template" .ini file thinking that was where the lines needed to go. Xdebug was loaded as a browser module, but was not loaded when I ran the coverage report in PHPUnit. So, in Pro, you have to add the config options to /Applications/MAMP/conf/php5. This is the ini file that the CLI version of PHP uses.
Here are the lines I added to get it working. Note that you may also need to disable the ZendExtensionManager and the zend_optimizer extension for it to work..in MAMP just uncheck the box. Check the compatibility section on the install page for more.
[Zend] ;zend_optimizer.optimization_level=15 ;zend_extension_manager.optimizer=/Applications/MAMP/bin/php5/zend/lib/Optimizer-3.3.3 ;zend_optimizer.version=3.3.3 ;zend_extension=/Applications/MAMP/bin/php5/zend/lib/ZendExtensionManager.so [xdebug] zend_extension=/Applications/MAMP/bin/php5/lib/php/extensions/no-debug-non-zts-20050922/xdebug.so xdebug.remote_enable = 1
If you completed the other article, PHPUnit should be using MAMP's php, which should now have Xdebug rocking and you can do something like:
# 'report' is the name of the folder the html will output to $ phpunit --report report My_Test