Way to analyse PHPUnit tests with Webgrind or other PHP profiling tool?

Way to analyse PHPUnit tests with Webgrind or other PHP profiling tool?

Profiling an entire application can be good for macro optimizations. But
sometimes I want to optimize a specific package or library without other
components interacting, with total isolation.
So I was thinking if phpunit has output for profiling tools like Webgrind?
Or at least is there a way to generate call graphs and performance reports
for my unit tests?
Please don't suggest to use microtime() or other php time functions and
make manual benchmarks, this is too error prone.