def METHOD_NAME(self):
    storage_config = '{"wallet_scheme":"MultiWalletSingleTable"}'
    storage_creds = '"account":"test"'
    mock_stg_lib = async_mock.MagicMock(
        postgresstorage_init=async_mock.MagicMock(return_value=0),
        init_storagetype=async_mock.MagicMock(return_value=2),
    )
    with async_mock.patch.object(
        test_module.cdll, "LoadLibrary", async_mock.Mock()
    ) as mock_load:
        mock_load.return_value = mock_stg_lib
        with self.assertRaises(OSError) as context:
            test_module.load_postgres_plugin(
                storage_config, storage_creds, raise_exc=True
            )
        assert "Invalid stringified JSON input" in str(context.exception)