message: improved robustness of Question and Answer content checks and tests

chatmastermind/chat.py

@@ -271,18 +271,24 @@ class ChatDB(Chat):
         self.messages += new_messages
         self.sort()
 
-    def write_db(self) -> None:
+    def write_db(self, msgs: Optional[list[Message]] = None) -> None:
         """
-        Write all messages to the DB directory. If a message has no file_path,
-        a new one will be created. If message.file_path exists, it will be modified
-        to point to the DB directory.
+        Write messages to the DB directory. If a message has no file_path, a new one
+        will be created. If message.file_path exists, it will be modified to point
+        to the DB directory.
         """
-        write_dir(self.db_path, self.messages, self.file_suffix, self.get_next_fid)
+        write_dir(self.db_path,
+                  msgs if msgs else self.messages,
+                  self.file_suffix,
+                  self.get_next_fid)
 
-    def write_cache(self) -> None:
+    def write_cache(self, msgs: Optional[list[Message]] = None) -> None:
         """
-        Write all messages to the cache directory. If a message has no file_path,
-        a new one will be created. If message.file_path exists, it will be modified
-        to point to the cache directory.
+        Write messages to the cache directory. If a message has no file_path, a new one
+        will be created. If message.file_path exists, it will be modified to point to
+        the cache directory.
         """
-        write_dir(self.cache_path, self.messages, self.file_suffix, self.get_next_fid)
+        write_dir(self.cache_path,
+                  msgs if msgs else self.messages,
+                  self.file_suffix,
+                  self.get_next_fid)