chore: import upstream snapshot with attribution

backend/tests/test_slack_socket_mode.py

@@ -0,0 +1,54 @@
+# tests/test_slack_socket_mode.py
+import importlib
+from unittest.mock import AsyncMock, patch
+
+import pytest
+
+
+@pytest.mark.asyncio
+async def test_start_socket_mode_starts_handler(monkeypatch):
+    """
+    The function should:
+      • build an AsyncSocketModeHandler with the global slack_app
+      • use the token found in SLACK_WEBSOCKET_TOKEN
+      • await the handler.start_async() coroutine exactly once
+    """
+    token = "xapp-fake-token"
+    # minimal env required for the Slack module to initialise
+    monkeypatch.setenv("SLACK_BOT_TOKEN", "xoxb-fake-bot")
+    monkeypatch.setenv("SLACK_WEBSOCKET_TOKEN", token)
+
+    # Import the module first to avoid lazy import registry issues
+    slack_app_mod = importlib.import_module("chainlit.slack.app")
+
+    # Patch the object directly instead of using string path
+    with patch.object(
+        slack_app_mod, "AsyncSocketModeHandler", autospec=True
+    ) as handler_cls:
+        handler_instance = AsyncMock()
+        handler_cls.return_value = handler_instance
+
+        # Run: should build handler + await start_async
+        await slack_app_mod.start_socket_mode()
+
+        handler_cls.assert_called_once_with(slack_app_mod.slack_app, token)
+        handler_instance.start_async.assert_awaited_once()
+
+
+def test_slack_http_route_registered(monkeypatch):
+    """
+    When only the classic HTTP tokens are set (no websocket token),
+    the FastAPI app should expose POST /slack/events.
+    """
+    # HTTP-only environment
+    monkeypatch.setenv("SLACK_BOT_TOKEN", "xoxb-fake-bot")
+    monkeypatch.setenv("SLACK_SIGNING_SECRET", "shhh-fake-secret")
+    monkeypatch.delenv("SLACK_WEBSOCKET_TOKEN", raising=False)
+
+    # Re-import server with the fresh env so the route table is built correctly
+    server = importlib.reload(importlib.import_module("chainlit.server"))
+
+    assert any(
+        route.path == "/slack/events" and "POST" in route.methods
+        for route in server.router.routes
+    ), "Slack HTTP handler route was not registered"