diff --git a/python/src/deltachat/events.py b/python/src/deltachat/events.py
index 3d84c5120..9fd40edc2 100644
--- a/python/src/deltachat/events.py
+++ b/python/src/deltachat/events.py
@@ -29,9 +29,9 @@ class FFIEventLogger:
     # to prevent garbled logging
     _loglock = threading.RLock()
 
-    def __init__(self, account, init_time=None) -> None:
+    def __init__(self, account, logid=None, init_time=None) -> None:
         self.account = account
-        self.logid = self.account.get_config("displayname")
+        self.logid = logid or self.account.get_config("displayname")
         if init_time is None:
             init_time = time.time()
         self.init_time = init_time
diff --git a/python/src/deltachat/testplugin.py b/python/src/deltachat/testplugin.py
index 5f7ecd7e0..3e7d60987 100644
--- a/python/src/deltachat/testplugin.py
+++ b/python/src/deltachat/testplugin.py
@@ -254,6 +254,7 @@ class ACFactory:
         logid = "ac{}".format(len(self._accounts) + 1)
         path = self.tmpdir.join(logid)
         ac = Account(path.strpath, logging=self._logging)
+        ac._logid = logid  # later instantiated FFIEventLogger needs this
         ac._evtracker = ac.add_account_plugin(FFIEventTracker(ac))
         self._accounts.append(ac)
         return ac
@@ -305,7 +306,6 @@ class ACFactory:
         configdict.setdefault("bcc_self", False)
         configdict.setdefault("mvbox_move", False)
         configdict.setdefault("sentbox_watch", False)
-        configdict.setdefault("displayname", os.path.basename(ac.db_path))
         ac.update_config(configdict)
         self._preconfigure_key(ac, configdict["addr"])
         return ac
@@ -331,14 +331,13 @@ class ACFactory:
         assert logstart in ("after_inbox_idle_ready",), logstart
 
         for acc in self._accounts:
-            logger = FFIEventLogger(acc, init_time=self.init_time)
+            logger = FFIEventLogger(acc, logid=acc._logid, init_time=self.init_time)
             self.wait_configure(acc)
             acc.start_io()
-            print("{}: {} waiting for inbox idle to become ready".format(
-                acc.get_config("displayname"), acc.get_config("addr")))
+            acc.log("waiting for inbox IDLE to become ready")
             acc._evtracker.wait_idle_inbox_ready()
-            print("{}: {} account IMAP IO ready to receive".format(
-                acc.get_config("displayname"), acc.get_config("addr")))
+            print("account IDLE: ready")
+            assert 0
             if logstart == "after_inbox_idle_ready":
                 acc.add_account_plugin(logger)
 
diff --git a/python/tests/test_account.py b/python/tests/test_account.py
index 2d17e9fcc..04872bdc4 100644
--- a/python/tests/test_account.py
+++ b/python/tests/test_account.py
@@ -1145,11 +1145,10 @@ class TestOnlineAccount:
 
     def test_message_override_sender_name(self, acfactory, lp):
         ac1, ac2 = acfactory.get_online_accounts(2)
+        ac1.set_config("displayname", "ac1-default-displayname")
         chat = acfactory.get_accepted_chat(ac1, ac2)
         overridden_name = "someone else"
 
-        ac1.set_config("displayname", "ac1")
-
         lp.sec("sending text message with overridden name from ac1 to ac2")
         msg1 = Message.new_empty(ac1, "text")
         msg1.set_override_sender_name(overridden_name)
@@ -1160,7 +1159,9 @@ class TestOnlineAccount:
         lp.sec("wait for ac2 to receive message")
         msg2 = ac2._evtracker.wait_next_incoming_message()
         assert msg2.text == "message1"
-        assert msg2.get_sender_contact().name == ac1.get_config("displayname")
+        sender = msg2.get_sender_contact()
+        assert sender.addr == ac1.get_config("addr")
+        assert sender.name == ac1.get_config("displayname")
         assert msg2.override_sender_name == overridden_name
 
         lp.sec("sending normal text message from ac1 to ac2")
@@ -2846,7 +2847,8 @@ class TestOnlineAccount:
         lp.sec("send out message with bcc to ourselves")
         ac1.direct_imap.idle_start()
         ac1.set_config("bcc_self", "1")
-        ac1.create_chat(ac2).send_text("outgoing, encrypted direct message, creating a chat")
+        ac1_ac2_chat = ac1.create_chat(ac2)
+        ac1_ac2_chat.send_text("outgoing, encrypted direct message, creating a chat")
 
         # now wait until the bcc_self message arrives
         assert ac1.direct_imap.idle_wait_for_seen()
@@ -2858,11 +2860,12 @@ class TestOnlineAccount:
 
         ac1_clone.start_io()
         ac1_clone._evtracker.wait_idle_inbox_ready()
+
         chats = ac1_clone.get_chats()
         assert len(chats) == 4  # two newly created chats + self-chat + device-chat
         group_chat = [c for c in chats if c.get_name() == "group name"][0]
         assert group_chat.is_group()
-        private_chat = [c for c in chats if c.get_name() == "ac2"][0]
+        private_chat, = [c for c in chats if c.get_name() == ac1_ac2_chat.get_name()]
         assert not private_chat.is_group()
 
         group_messages = group_chat.get_messages()