Code coverage in SimpleTest

Is there any way to generate code coverage report when using SimpleTest similar to PHPUnit.

I have read the documentation of SimpleTest on their website but can not find a clear way on how to do it! I came across this website that says

we can add require_once (dirname(__FILE__).'/coverage.php') to the intended file and it should generate the report, but it did not work!

If there is a helpful website on how to generate code coverage, please share it here.

Thanks alot.