Nah, just downgrade phpunit to 4

Author: ssfinney

composer.json

@@ -23,8 +23,7 @@
     },
     "require-dev": {
         "mockery/mockery": "~0.9",
-        "php": ">=5.6.0",
-        "phpunit/phpunit": "~5.0",
+        "phpunit/phpunit": "~4.0",
         "psy/psysh": "^0.5.1",
         "satooshi/php-coveralls": "~1",
         "symfony/thanks": "^1.0",