make chats objects grow equality operators, probably we rather want to move to "attr" which handles all of this.

python/src/deltachat/account.py

@@ -104,6 +104,15 @@ class Chat:
         self.dc_context = dc_context
         self.id = chat_id
 
+    def __eq__(self, other_chat):
+        return (
+            self.dc_context == getattr(other_chat, "dc_context", None) and
+            self.id == getattr(other_chat, "id", None)
+        )
+
+    def __ne__(self, other_chat):
+        return not self == other_chat
+
     def send_text_message(self, msg):
         """ return ID of the message in this chat.
         'msg' should be unicode"""
@@ -122,6 +131,11 @@ class Message:
     def text(self):
         return ffi_unicode(capi.lib.dc_msg_get_text(self.dc_msg))
 
+    @property
+    def chat(self):
+        chat_id = capi.lib.dc_msg_get_chat_id(self.dc_msg)
+        return Chat(self.dc_context, chat_id)
+
 
 class Account:
     def __init__(self, db_path, _logid=None):

python/tests/test_account.py

@@ -26,6 +26,8 @@ class TestOfflineAccount:
 
         chat2 = ac1.create_chat_by_contact(contact1.id)
         assert chat2.id == chat.id
+        assert chat == chat2
+        assert not (chat != chat2)
 
 
 class TestOnlineAccount:
@@ -71,7 +73,8 @@ class TestOnlineAccount:
         assert data1 == chat.id
         assert data2 == msg_id
         ev = ac2._evlogger.get_matching("DC_EVENT_MSGS_CHANGED")
-        assert ev[1] == chat.id
         assert ev[2] == msg_id
         msg = ac2.get_message(msg_id)
         assert msg.text == "msg1"
+        # note that ev[1] aka data1 contains a bogus channel id
+        # probably should just not get passed from the core