def METHOD_NAME(
    staff_api_client,
    voucher_percentage,
    voucher_with_many_channels,
    permission_manage_discounts,
    channel_PLN,
    product,
):
    query = """
    query vouchers {
        vouchers(first: 2) {
            edges {
                node {
                    name
                }
            }
        }
    }
    """
    response = staff_api_client.post_graphql(
        query, permissions=[permission_manage_discounts]
    )
    content = get_graphql_content(response)
    assert len(content["data"]["vouchers"]["edges"]) == 2