diff --git a/tests/PHPUnit/CustomAffixes/snake_case_spec.php b/tests/PHPUnit/CustomAffixes/snake_case_spec.php
new file mode 100644
index 00000000..1fa89600
--- /dev/null
+++ b/tests/PHPUnit/CustomAffixes/snake_case_spec.php
@@ -0,0 +1,4 @@
+<?php
+
+test(sprintf('this runs file names like "%s"', basename(__FILE__)))
+    ->assertTrue(true);