bug fix to avoid swallowing exceptions/failed pages inside fetch_all_pages/small refactor

tests/test_fetch_all_pages.py

@@ -0,0 +1,43 @@
+"""unit test: fetch_all_pages result accounting for any iterable input
+
+run from the repo root:
+    uv run pytest tests/test_fetch_all_pages.py
+
+pure and offline — no HTTP. Regression: a generator page_range was exhausted
+building the tasks, so the result pairing dropped every failure and swallowed
+unexpected exceptions.
+"""
+
+import asyncio
+
+import pytest
+from aioweb import AiowebError
+
+from monitor_utils.runner import fetch_all_pages
+
+
+async def _failing_fetch(page: int):
+    raise AiowebError(f"page {page} failed")
+
+
+async def _crashing_fetch(page: int):
+    raise ValueError(f"page {page} crashed")
+
+
+def test_generator_input_still_reports_failed_pages():
+    failed = asyncio.run(
+        fetch_all_pages((p for p in [2, 3]), _failing_fetch, "cat", "page")
+    )
+    assert failed == [2, 3]
+
+
+def test_generator_input_still_raises_unexpected_errors():
+    with pytest.raises(ValueError):
+        asyncio.run(fetch_all_pages((p for p in [2]), _crashing_fetch, "cat", "page"))
+
+
+def test_range_input_reports_failed_pages():
+    """The re-iterable path the in-repo caller uses keeps working."""
+
+    failed = asyncio.run(fetch_all_pages(range(2, 4), _failing_fetch, "cat", "page"))
+    assert failed == [2, 3]