added optional semphore

tests/test_pagination_semaphore.py

@@ -82,3 +82,26 @@ def test_single_call_respects_its_semaphore():
 
     asyncio.run(run())
     assert state["peak"] <= limit, f"peak {state['peak']} over limit {limit}"
+
+
+def test_omitted_semaphore_runs_unbounded():
+    """Omitting the semaphore lets all pages fan out concurrently.
+
+    With no semaphore the only bound is the page count; pages 2..10 (nine pages)
+    should all be in flight at once, so peak concurrency reaches nine.
+    """
+
+    state = {"live": 0, "peak": 0}
+    func = _make_tracking_func(state)
+
+    async def run():
+        await execute_pagination(
+            "cat",
+            total_products=300,
+            products_per_page=30,
+            func=func,
+            session=None,
+        )
+
+    asyncio.run(run())
+    assert state["peak"] == 9, f"expected all 9 pages concurrent, got {state['peak']}"