diff --git a/tests/PHPUnit/CustomAffixes/!@#$%^&*()-_=+.php b/tests/PHPUnit/CustomAffixes/!@#$%^&*()-_=+.php
new file mode 100644
index 00000000..accf5eee
--- /dev/null
+++ b/tests/PHPUnit/CustomAffixes/!@#$%^&*()-_=+.php
@@ -0,0 +1,6 @@
+<?php
+
+test(sprintf('this runs file names like "%s"', basename(__FILE__)))
+    ->assertTrue(true);
+
+    //!@#$%^&*()-_=+