chore: import upstream snapshot with attribution

tests/test_channels/test_streaming_edit_errors.py

@@ -0,0 +1,51 @@
+from __future__ import annotations
+
+from collections.abc import AsyncIterator
+
+import httpx
+import pytest
+
+from opensquilla.channels.discord import DiscordChannel, DiscordChannelConfig
+from opensquilla.channels.slack import SLACK_API_BASE, SlackChannel
+
+
+async def _two_chunks() -> AsyncIterator[str]:
+    yield "first chunk"
+    yield "second chunk"
+
+
+async def test_discord_send_streaming_surfaces_rejected_edit() -> None:
+    config = DiscordChannelConfig(token="token", default_channel_id="123")
+    channel = DiscordChannel(config=config)
+
+    def handler(request: httpx.Request) -> httpx.Response:
+        if request.method == "POST":
+            return httpx.Response(200, json={"id": "m1"})
+        return httpx.Response(400, json={"code": 50035, "message": "Invalid Form Body"})
+
+    channel._client = httpx.AsyncClient(
+        base_url=config.api_base, transport=httpx.MockTransport(handler)
+    )
+    try:
+        with pytest.raises(httpx.HTTPStatusError):
+            await channel.send_streaming(_two_chunks(), update_interval_ms=0)
+    finally:
+        await channel._client.aclose()
+
+
+async def test_slack_send_streaming_surfaces_edit_api_error() -> None:
+    channel = SlackChannel(token="xoxb-dummy", slack_channel_id="C123")
+
+    def handler(request: httpx.Request) -> httpx.Response:
+        if request.url.path.endswith("/chat.postMessage"):
+            return httpx.Response(200, json={"ok": True, "ts": "111.222"})
+        return httpx.Response(200, json={"ok": False, "error": "msg_too_long"})
+
+    channel._client = httpx.AsyncClient(
+        base_url=SLACK_API_BASE, transport=httpx.MockTransport(handler)
+    )
+    try:
+        with pytest.raises(RuntimeError, match="msg_too_long"):
+            await channel.send_streaming(_two_chunks(), update_interval_ms=0)
+    finally:
+        await channel._client.aclose()