diff --git a/test/helper.py b/test/helper.py
index 6b9c582..a4657ad 100644
--- a/test/helper.py
+++ b/test/helper.py
@@ -328,15 +328,15 @@ def shutdown(self, wait=True):
 
 
 def convert_command(tag: str) -> str:
-    match platform.system():
-        case "Windows":
-            return (
-                'powershell -Command "'
-                "Copy-Item -Path '$source' -Destination '$dest' -NoNewline;"
-                f"Add-Content -Path '$dest' -Value {tag}"
-                '"'
-            )
-        case "Linux":
-            return f"bash -c\" cp '$source' '$dest'; printf {tag} >> '$dest' \""
-        case system:
-            raise Exception(f"Unsupported system: {system}")
+    system = platform.system()
+    if system == "Window":
+        return (
+            'powershell -Command "'
+            "Copy-Item -Path '$source' -Destination '$dest' -NoNewline;"
+            f"Add-Content -Path '$dest' -Value {tag}"
+            '"'
+        )
+    elif system == "Linux":
+        return f"bash -c\" cp '$source' '$dest'; printf {tag} >> '$dest' \""
+    else:
+        raise Exception(f"Unsupported system: {system}")