test(timeout): give the settings tests' database the suite's 1 GiB max_db_size

On the C-API backend, every test_timeout.py test that uses the conn fixture
failed at random in setup with "Buffer manager exception: Mmap for size
8796093022208 failed." The fixture opened lb.Database(":memory:") with the
default max_db_size, which reserves 8 TiB of address space. By then 14
default-size databases from test_fsm.py, test_database.py and test_exception.py
are still mapped, because the C-API Database frees its native database only in
close() or at exit. The rest of the 128 TiB is often split into gaps smaller
than 8 TiB. The fixture now passes max_db_size like the conftest's databases.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: 2 people

test/test_timeout.py

@@ -40,9 +40,9 @@ def _interrupt_until_done(conn: lb.Connection, *threads: threading.Thread) -> No
 
 
 @pytest.fixture
-def conn() -> Iterator[lb.Connection]:
+def conn(max_db_size: int) -> Iterator[lb.Connection]:
     # A fresh connection: the shared read-only one carries other tests' settings.
-    db = lb.Database(":memory:")
+    db = lb.Database(":memory:", max_db_size=max_db_size)
     conn = lb.Connection(db)
     yield conn
     conn.close()