def METHOD_NAME():
    client = boto3.client("rds", region_name="us-west-2")
    with pytest.raises(ClientError) as ex:
        client.describe_event_subscriptions(SubscriptionName="my-db-events")
    err = ex.value.response["Error"]
    assert err["Code"] == "SubscriptionNotFoundFault"
    assert err["Message"] == "Subscription my-db-events not found."