NetBeans has a nice code coverage-feature, but I experienced the problem that one machine I could get code coverage reports, but not on another machine. The configuration of both machines was the same: same Windows-version (Windows 7), same PHP-version (5.4.0), had the same version of XDebug (a requirement for having code coverage). I checked and changed some security settings on folders like the Temp-folder of PHP, Windows, XDebug, etc., but nothing worked. In the end I found out that it’s caused by a difference in the installation-folder of NetBeans.
On the first PC (were Code Coverage was working well) the installation-folder of NetBeans and the source code were located on the same drive, while on the second PC the installation-folder of NetBeans and the source code were on different drives.
Seems like a real bug in NetBeans…
However, you can still get nice code coverage results in a HTML-format by running your tests from the command line.
No Code Coverage Report
Code Coverage Report Generated because NetBeans and the source code are on the same drive
jdhnet 
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