fix: require markdown_text in chat.appendStream method

Author: zimeg

slack_sdk/web/async_client.py

@@ -2625,7 +2625,7 @@ async def chat_appendStream(
         *,
         channel: str,
         ts: str,
-        markdown_text: Optional[str] = None,
+        markdown_text: str,
         **kwargs,
     ) -> AsyncSlackResponse:
         """Appends text to an existing streaming conversation.

slack_sdk/web/client.py

@@ -2615,7 +2615,7 @@ def chat_appendStream(
         *,
         channel: str,
         ts: str,
-        markdown_text: Optional[str] = None,
+        markdown_text: str,
         **kwargs,
     ) -> SlackResponse:
         """Appends text to an existing streaming conversation.

slack_sdk/web/legacy_client.py

@@ -2627,7 +2627,7 @@ def chat_appendStream(
         *,
         channel: str,
         ts: str,
-        markdown_text: Optional[str] = None,
+        markdown_text: str,
         **kwargs,
     ) -> Union[Future, SlackResponse]:
         """Appends text to an existing streaming conversation.

tests/slack_sdk_async/web/test_web_client_coverage.py

@@ -541,8 +541,8 @@ async def run_method(self, method_name, method, async_method):
                 self.api_methods_to_call.remove(method(canvas_id="F123", criteria={})["method"])
                 await async_method(canvas_id="F123", criteria={})
             elif method_name == "chat_appendStream":
-                self.api_methods_to_call.remove(method(channel="C123", ts="123.123")["method"])
-                await async_method(channel="C123", ts="123.123")
+                self.api_methods_to_call.remove(method(channel="C123", ts="123.123", markdown_text="**bold**")["method"])
+                await async_method(channel="C123", ts="123.123", markdown_text="**bold**")
             elif method_name == "chat_delete":
                 self.api_methods_to_call.remove(method(channel="C123", ts="123.123")["method"])
                 await async_method(channel="C123", ts="123.123")