test: Test telegram init exception handling

tests/rpc/test_rpc_telegram.py

@@ -177,7 +177,7 @@ def test_telegram_init(default_conf, mocker, caplog) -> None:
     assert log_has(message_str, caplog)
 
 
-async def test_telegram_startup(default_conf, mocker) -> None:
+async def test_telegram_startup(default_conf, mocker, caplog) -> None:
     app_mock = MagicMock()
     app_mock.initialize = AsyncMock()
     app_mock.start = AsyncMock()
@@ -193,6 +193,12 @@ async def test_telegram_startup(default_conf, mocker) -> None:
     assert app_mock.updater.start_polling.call_count == 1
     assert sleep_mock.call_count == 1
 
+    # Test telegram Retries and Exceptions
+    app_mock.start = AsyncMock(side_effect=Exception("Test exception"))
+    await telegram._startup_telegram()
+    assert app_mock.start.call_count == 3
+    assert log_has("Telegram init failed.", caplog)
+
 
 async def test_telegram_cleanup(
     default_conf,