Add a simple e2e test that joins a channel with xep0106-encoded name

tests/end_to_end/__main__.py

@@ -686,7 +686,22 @@ if __name__ == '__main__':
                      partial(expect_stanza,
                      "/message[@from='{lower_nick_two}!{irc_server_one}'][@to='{jid_one}/{resource_one}']"),
                  ]
-                 )
+                 ),
+                Scenario("encoded_channel_join",
+                 [
+                     handshake_sequence(),
+                     partial(send_stanza,
+                             "<presence from='{jid_one}/{resource_one}' to='#biboumi\\40louiz.org\\3a80%{irc_server_one}/{nick_one}' />"),
+                     connection_sequence("irc.localhost", '{jid_one}/{resource_one}'),
+                     partial(expect_stanza,
+                             "/message/body[text()='Mode #biboumi@louiz.org:80 [+nt] by {irc_host_one}']"),
+                     partial(expect_stanza,
+                             ("/presence[@to='{jid_one}/{resource_one}'][@from='#biboumi\\40louiz.org\\3a80%{irc_server_one}/{nick_one}']/muc_user:x/muc_user:item[@affiliation='admin'][@role='moderator']",
+                             "/presence/muc_user:x/muc_user:status[@code='110']")
+                             ),
+                     partial(expect_stanza, "/message[@from='#biboumi\\40louiz.org\\3a80%{irc_server_one}'][@type='groupchat']/subject[not(text())]"),
+                 ]),
+
     )
 
     failures = 0