Verify client context managers close on exceptions

Co-authored-by: Shri Sukhani <shrisukhani@users.noreply.github.com>

Author: cursoragent

tests/test_client_lifecycle.py

@@ -1,5 +1,7 @@
 import asyncio
 
+import pytest
+
 from hyperbrowser.client.async_client import AsyncHyperbrowser
 from hyperbrowser.client.managers.async_manager.session import SessionEventLogsManager
 from hyperbrowser.client.sync import Hyperbrowser
@@ -43,6 +45,45 @@ async def tracked_close() -> None:
     asyncio.run(run())
 
 
+def test_sync_client_context_manager_closes_transport_on_exception():
+    client = Hyperbrowser(api_key="test-key")
+    close_calls = {"count": 0}
+    original_close = client.transport.close
+
+    def tracked_close() -> None:
+        close_calls["count"] += 1
+        original_close()
+
+    client.transport.close = tracked_close
+
+    with pytest.raises(RuntimeError, match="sync boom"):
+        with client:
+            raise RuntimeError("sync boom")
+
+    assert close_calls["count"] == 1
+
+
+def test_async_client_context_manager_closes_transport_on_exception():
+    async def run() -> None:
+        client = AsyncHyperbrowser(api_key="test-key")
+        close_calls = {"count": 0}
+        original_close = client.transport.close
+
+        async def tracked_close() -> None:
+            close_calls["count"] += 1
+            await original_close()
+
+        client.transport.close = tracked_close
+
+        with pytest.raises(RuntimeError, match="async boom"):
+            async with client:
+                raise RuntimeError("async boom")
+
+        assert close_calls["count"] == 1
+
+    asyncio.run(run())
+
+
 def test_async_session_event_logs_annotation_is_response_model():
     assert (
         SessionEventLogsManager.list.__annotations__["return"]