Make sure the file gets closed.

Author: itamarst

tests/unit/test_network_cache.py

@@ -37,7 +37,8 @@ def test_cache_roundtrip_body(self, cache_tmpdir: Path) -> None:
         cache.set_body("test key", b"a test string")
         body = cache.get_body("test key")
         assert body is not None
-        assert body.read() == b"a test string"
+        with body:
+            assert body.read() == b"a test string"
         cache.delete("test key")
         assert cache.get_body("test key") is None