The –filter commandline option can be used to execute only a specific selection of tests. You can use it to filter on a class or method, bypassing all other tests which do not match the filter.
phpunit --filter testMethod
phpunit --filter ClassTest
phpunit path/to/ClassText
Inspired from http://melikedev.com/2012/01/30/phpunit-how-to-run-phpunit-against-a-specific-test/