test: correct suite extraction logic

Author: xepozz

tests/bootstrap.php

@@ -35,7 +35,7 @@
     return null;
 })($GLOBALS['argv'] ?? []);
 
-$suite = \substr($suite, 0, \strpos($suite, '-'));
+$suite = \substr($suite, 0, \strpos($suite, '-') ?: \strlen($suite));
 
 # Include related bootstrap
 $file = __DIR__ . DIRECTORY_SEPARATOR . $suite . DIRECTORY_SEPARATOR . 'bootstrap.php';