Testing Routing failure on browser testkit (#1224)

Browser version of testkit was running firefox with a DNS cache, which was liable to cause failures of mixing up the cores, as they do not always keep their IP addresses

Author: MaxAake

.gitignore

@@ -19,3 +19,4 @@ coverage
 *.code-workspace
 /testkit/CAs
 /testkit/CustomCAs
+/testkit/firefox_profile/*

testkit/backend.py

@@ -12,6 +12,7 @@
 import os
 import time
 
+
 if __name__ == "__main__":
     print("starting backend")
     backend_script = "start-testkit-backend"
@@ -34,7 +35,7 @@
             time.sleep(5)
             print("openning firefox")
             with open_proccess_in_driver_repo([
-                "firefox", "-headless", "http://localhost:8000"
+                "firefox", "--profile", "./testkit/firefox_profile", "--headless", "http://localhost:8000" # type: ignore
             ]) as firefox:
                 firefox.wait()
         backend.wait()

testkit/firefox_profile/prefs.js

@@ -0,0 +1,3 @@
+/* global user_pref */
+user_pref('network.dnsCacheExpiration', 0);
+user_pref('network.dnsCacheExpirationGracePeriod', 0);