diff --git a/test/case/ietf_system/upgrade/test.py b/test/case/ietf_system/upgrade/test.py
index 1e05d4d1..24d45737 100755
--- a/test/case/ietf_system/upgrade/test.py
+++ b/test/case/ietf_system/upgrade/test.py
@@ -4,16 +4,11 @@
 
 Verify it is possible to upgrade.
 """
-import concurrent.futures
-import functools
-import http.server
 import os
-import socket
 import time
-
 import netifaces
-
 import infamy
+import infamy.file_server as srv
 
 SRVPORT = 8008
 
@@ -27,25 +22,6 @@
     "package"
 )
 
-class FileServer(http.server.HTTPServer):
-    class RequestHandler(http.server.SimpleHTTPRequestHandler):
-        def log_message(*args, **kwargs):
-            pass
-
-    address_family = socket.AF_INET6
-
-    def __init__(self, server_address, directory):
-        rh = functools.partial(FileServer.RequestHandler, directory=directory)
-        self.__tp = concurrent.futures.ThreadPoolExecutor(max_workers=1)
-        super().__init__(server_address, rh)
-
-    def __enter__(self):
-        self.__tp.submit(self.serve_forever)
-
-    def __exit__(self, _, __, ___):
-        self.shutdown()
-        self.__tp.shutdown()
-
 with infamy.Test() as test:
     with test.step("Set up topology and attach to target DUT"):
         env = infamy.Env()
@@ -66,7 +42,7 @@ def __exit__(self, _, __, ___):
         hip = netifaces.ifaddresses(hport)[netifaces.AF_INET6][0]["addr"]
         hip = hip.replace(f"%{hport}", f"%{tport}")
 
-    with FileServer(("::", SRVPORT), BUNDLEDIR):
+    with srv.FileServer(("::", SRVPORT), BUNDLEDIR):
 
         with test.step("Start installation of selected package"):
             print(f"Installing {os.path.basename(env.args.package)}")
diff --git a/test/infamy/file_server.py b/test/infamy/file_server.py
new file mode 100644
index 00000000..68de4d9c
--- /dev/null
+++ b/test/infamy/file_server.py
@@ -0,0 +1,28 @@
+"""
+Basic file server over HTTP
+"""
+import concurrent.futures
+import functools
+import http.server
+import socket
+
+
+class FileServer(http.server.HTTPServer):
+    """Open web server on (address, port) serving files from directory"""
+    class RequestHandler(http.server.SimpleHTTPRequestHandler):
+        def log_message(self, *args, **kwargs):
+            pass
+
+    address_family = socket.AF_INET6
+
+    def __init__(self, server_address, directory):
+        rh = functools.partial(FileServer.RequestHandler, directory=directory)
+        self.__tp = concurrent.futures.ThreadPoolExecutor(max_workers=1)
+        super().__init__(server_address, rh)
+
+    def __enter__(self):
+        self.__tp.submit(self.serve_forever)
+
+    def __exit__(self, _, __, ___):
+        self.shutdown()
+        self.__tp.shutdown()