fix(regression): correctly extract system name from pytest parametrized cases

Author: harryswift01

tests/regression/list_systems.py

@@ -4,7 +4,7 @@
 
 
 def main():
-    systems = sorted({case.system for case in discover_cases()})
+    systems = sorted({case.values[0].system for case in discover_cases()})
     print(json.dumps(systems))