Current versions of PHPUnit >3.6.4 (and all 3.5.* versions) will just print everything you echo in a test case.
produces:
phpunit foo.php
PHPUnit 3.6.7 by Sebastian Bergmann.
.Hi
Time: 0 seconds, Memory: 3.25Mb
OK (1 test, 0 assertions)
So if you are on an old 3.6 version just upgrade :)