PHPUnitAnnotationCompleter is a project mainly written in Java, it's free.
This Netbeans plugin provides editor completion for PHPUnit annotations
This Netbeans plugins provides completion support for PHPUnit annotation (see PHPUnit's documentation on annotation for more info). Some of the code is taken from a code completion tutorial on Netbeans' website
Tested with Netbeans 6.9.1 on osX 10.6