New Line After Each PHPUnit Test

I've got a test suite setup on a Laravel project which uses PHPUnit. Usually the dots which indicate whether the test has passed or not are shown on the same line, however in this project each dot is separated with a new line:

I've searched through all my tests to see if something is echoing an \n or a PHP_EOL but can't see anything, I've tried different versions of PHPUnit and I've tried starting over with a totally new test suite. None of these attempts have fixed the problem! The configuration in phpunit.xml for this test suite is identical to other projects too.

Can anyone suggest anything else I could do to fix this?