Allow TestCase to assess if STDERR buffer is a real error when running in process isolation about phpunit

[whatthejeff]

Since this is sort of a rare situation, I don't really think it warrants changes to the core libraries. You can actually handle this in a couple of different ways:

1. Trap STDERR in your application code. For me this makes the most sense. Then you can differentiate between actual errors and just noise in your application code and use your tests to ensure that your application is handling the errors correctly.
2. If you really must allow STDERR to bubble up through your tests, redirect it to STDOUT or to a file in your application code so that your tests can process it without triggering an error.
3. If neither of the above options work for you, as a last resort you can subclass PHPUnit_Framework_TestCase and call a version of PHPUnit_Util_PHP ::runJobs() that is customized for your exact specifications.

[sebastianbergmann]

Closing.