How to run PHPUnit tests in elgg?

I want to run php unit tests in my custom plugin. I have found one plugin  called Unit Test Runner (PHPUnit) to run the test cases. But it's not working. When i tried to it pg/testing url it's showing blank page. Do i need to add any configuration details specific to local elgg setup inside plugin? Can any one help me on this.

And even, We can run the unit tests using diagnostics plugin by writng the unit tests inside tests folder in our custom plugin. It us also not workign for me. Can any one give some suggestion over this.