如何将ZF2单元/应用程序模块测试合并到单个调用中?

I'm following the ZF2 convention of storing tests in the modules and everything is working fine when tests are run from within each module. What I would like to do is have a root level phpunit.xml that calls the individual module tests and consolidates them to produce code coverage data and other metrics.I'm following the ZF2 convention of storing tes