When writing or debugging PHP extensions, it is very useful to have test coverage. It is also very interesting to know what test covers which files, similar to what PHPUnit generates for PHP.
From time to time you have to deal with someone else’s code. And the code you have to deal with sometimes surprises you. For example, Pimple, a small Dependency Injection Container for PHP; recent versions of which, according to README, are more focused on performance
. Learning something new is always interesting and sometimes funny, and therefore I started to read the code.