1 files changed, 85 insertions, 0 deletions
diff --git a/tests/edge_cases/test_notifier_failures.py b/tests/edge_cases/test_notifier_failures.py
new file mode 100644
index 0000000..4ba781f
--- /dev/null
+++ b/tests/edge_cases/test_notifier_failures.py
@@ -0,0 +1,85 @@
+"""Tests for TelegramNotifier failure modes."""
+
+import asyncio
+import logging
+import sys
+from pathlib import Path
+from unittest.mock import AsyncMock, MagicMock, patch
+
+import aiohttp
+import pytest
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[2] / "services" / "strategy-engine"))
+sys.path.insert(0, str(Path(__file__).resolve().parents[2] / "services" / "backtester" / "src"))
+
+from shared.notifier import TelegramNotifier
+
+
+@pytest.fixture
+def notifier():
+    return TelegramNotifier(bot_token="fake-token", chat_id="12345")
+
+
+class TestSendConnectionError:
+    """TelegramNotifier.send() when session.post raises ConnectionError should not crash."""
+
+    @pytest.mark.asyncio
+    async def test_connection_error_does_not_crash(self, notifier, caplog):
+        mock_session = AsyncMock(spec=aiohttp.ClientSession)
+        mock_session.closed = False
+        mock_session.post = MagicMock(side_effect=aiohttp.ClientError("Connection refused"))
+        notifier._session = mock_session
+
+        with caplog.at_level(logging.WARNING):
+            await notifier.send("test message")
+        # Should not raise, should log the error
+
+
+class TestSendRateLimited:
+    """TelegramNotifier.send() when API returns 429 should retry."""
+
+    @pytest.mark.asyncio
+    async def test_rate_limit_retries(self, notifier):
+        mock_response_429 = AsyncMock()
+        mock_response_429.status = 429
+        mock_response_429.json = AsyncMock(return_value={"description": "Too Many Requests"})
+        mock_response_429.__aenter__ = AsyncMock(return_value=mock_response_429)
+        mock_response_429.__aexit__ = AsyncMock(return_value=False)
+
+        mock_response_200 = AsyncMock()
+        mock_response_200.status = 200
+        mock_response_200.__aenter__ = AsyncMock(return_value=mock_response_200)
+        mock_response_200.__aexit__ = AsyncMock(return_value=False)
+
+        mock_session = AsyncMock(spec=aiohttp.ClientSession)
+        mock_session.closed = False
+        # First two calls return 429, third returns 200
+        mock_session.post = MagicMock(
+            side_effect=[mock_response_429, mock_response_429, mock_response_200]
+        )
+        notifier._session = mock_session
+
+        with patch("shared.notifier.asyncio.sleep", new_callable=AsyncMock):
+            await notifier.send("test message")
+
+        # Should have been called 3 times (2 retries + 1 success)
+        assert mock_session.post.call_count == 3
+
+
+class TestCloseAlreadyClosed:
+    """TelegramNotifier.close() when session already closed should not crash."""
+
+    @pytest.mark.asyncio
+    async def test_close_no_session(self):
+        notifier = TelegramNotifier(bot_token="fake", chat_id="123")
+        # No session created yet
+        await notifier.close()  # Should not raise
+
+    @pytest.mark.asyncio
+    async def test_close_already_closed_session(self, notifier):
+        mock_session = AsyncMock(spec=aiohttp.ClientSession)
+        mock_session.close = AsyncMock()
+        notifier._session = mock_session
+
+        await notifier.close()
+        await notifier.close()  # Second close should not crash