chore: import upstream snapshot with attribution

tests/browser/test_browser_manager_close.py

@@ -0,0 +1,35 @@
+from types import SimpleNamespace
+
+import pytest
+
+from crawl4ai.browser_manager import BrowserManager
+
+
+class _Context:
+    def __init__(self, manager=None):
+        self.manager = manager
+        self.closed = False
+
+    async def close(self):
+        self.closed = True
+        if self.manager:
+            self.manager.contexts_by_config.pop("second", None)
+
+
+@pytest.mark.asyncio
+async def test_close_iterates_over_context_snapshot():
+    manager = BrowserManager.__new__(BrowserManager)
+    manager.config = SimpleNamespace(cdp_url=None, sleep_on_close=False)
+    manager.sessions = {}
+    manager.browser = manager.managed_browser = manager.playwright = None
+    manager.logger = SimpleNamespace(error=lambda **_: None)
+    manager._using_cached_cdp = manager._launched_persistent = False
+    manager._context_refcounts = manager._context_last_used = manager._page_to_sig = {}
+    first, second = _Context(manager), _Context()
+    manager.contexts_by_config = {"first": first, "second": second}
+
+    await manager.close()
+
+    assert first.closed
+    assert second.closed
+    assert manager.contexts_by_config == {}