How to output in CLI during execution of PHP Unit tests?

Question

When running a PHPUnit test, I would like to be able to dump output so I can debug one or two things.

I have tried the following (similar to the PHPUnit Manual examp

Answer 1

I output my Testresults HTML based, in this case it was helpfull to flush the content:

var_dump($array);
ob_flush();

There is a second PHP Method

flush() 

which i not has tried.