feat: show typing status during processing

tests/test_typing.py

@@ -0,0 +1,27 @@
+import unittest
+from unittest.mock import AsyncMock, patch
+
+import bot
+
+
+class TypingStatusTests(unittest.IsolatedAsyncioTestCase):
+    async def test_sends_immediately_refreshes_and_cancels(self):
+        fake_bot = AsyncMock()
+        with patch.object(bot, "TYPING_REFRESH_SECONDS", 0.01):
+            async with bot.typing_status(fake_bot, 123):
+                await bot.asyncio.sleep(0.025)
+        self.assertGreaterEqual(fake_bot.send_chat_action.await_count, 2)
+        fake_bot.send_chat_action.assert_any_await(123, "typing")
+
+    async def test_stops_refresh_after_context(self):
+        fake_bot = AsyncMock()
+        with patch.object(bot, "TYPING_REFRESH_SECONDS", 0.01):
+            async with bot.typing_status(fake_bot, 123):
+                await bot.asyncio.sleep(0.015)
+            calls_after_exit = fake_bot.send_chat_action.await_count
+            await bot.asyncio.sleep(0.03)
+        self.assertEqual(fake_bot.send_chat_action.await_count, calls_after_exit)
+
+
+if __name__ == "__main__":
+    unittest.main()