fix: retry Telegram startup setup until reachable

tests/test_main_bot_startup.py

@@ -0,0 +1,80 @@
+import asyncio
+import logging
+
+from aiogram.exceptions import TelegramNetworkError
+
+from bot.main_bot import _run_telegram_startup_step
+
+
+def test_telegram_startup_network_error_retries_until_success_without_traceback(caplog):
+    calls = []
+
+    async def failing_step():
+        calls.append("try")
+        if len(calls) >= 3:
+            return
+        try:
+            raise OSError("Temporary failure in name resolution")
+        except OSError as exc:
+            raise TelegramNetworkError(
+                method=object(),
+                message="ClientConnectorDNSError: Cannot connect to host api.telegram.org:443",
+            ) from exc
+
+    with caplog.at_level(logging.INFO):
+        result = asyncio.run(
+            _run_telegram_startup_step(
+                "registering mini app menu button",
+                failing_step,
+                "unexpected",
+                retry_delay_seconds=0,
+            )
+        )
+
+    assert result is True
+    assert calls == ["try", "try", "try"]
+    assert "Telegram network error while registering mini app menu button" in caplog.text
+    assert (
+        "Telegram step succeeded while registering mini app menu button on attempt 3"
+        in caplog.text
+    )
+    assert "api.telegram.org" in caplog.text
+    assert "Temporary failure in name resolution" in caplog.text
+    assert "Traceback" not in caplog.text
+
+
+def test_telegram_startup_step_returns_true_on_success():
+    calls = []
+
+    async def successful_step():
+        calls.append("ok")
+
+    result = asyncio.run(
+        _run_telegram_startup_step(
+            "setting bot commands",
+            successful_step,
+            "unexpected",
+        )
+    )
+
+    assert result is True
+    assert calls == ["ok"]
+
+
+def test_telegram_startup_step_can_be_limited_for_tests(caplog):
+    async def failing_step():
+        raise TelegramNetworkError(method=object(), message="temporary dns failure")
+
+    with caplog.at_level(logging.WARNING):
+        result = asyncio.run(
+            _run_telegram_startup_step(
+                "setting bot commands",
+                failing_step,
+                "unexpected",
+                attempts=2,
+                retry_delay_seconds=0,
+            )
+        )
+
+    assert result is False
+    assert "after 2 attempts" in caplog.text