How to use the @0x/contracts-test-utils.ExchangeFunctionName.CancelOrder function in @0x/contracts-test-utils

[fnName](orders, orders.map(order => order.takerAssetAmount), orders.map(order => order.signature))
                .getABIEncodedTransactionData();
        } else if (constants.MARKET_FILL_FN_NAMES.indexOf(fnName) !== -1) {
            const fillAsset = /Buy/.test(fnName) ? 'makerAssetAmount' : 'takerAssetAmount';
            data = (exchangeInstance as any)
                [fnName](
                    orders,
                    orders.map(order => order[fillAsset]).reduce((prev, curr) => prev.plus(curr)),
                    orders.map(order => order.signature),
                )
                .getABIEncodedTransactionData();
        } else if (constants.MATCH_ORDER_FN_NAMES.indexOf(fnName) !== -1) {
            data = exchangeInstance
                .matchOrders(orders[0], orders[1], orders[0].signature, orders[1].signature)
                .getABIEncodedTransactionData();
        } else if (fnName === ExchangeFunctionName.CancelOrder) {
            data = exchangeInstance.cancelOrder(orders[0]).getABIEncodedTransactionData();
        } else if (fnName === ExchangeFunctionName.BatchCancelOrders) {
            data = exchangeInstance.batchCancelOrders(orders).getABIEncodedTransactionData();
        } else if (fnName === ExchangeFunctionName.CancelOrdersUpTo) {
            data = exchangeInstance.cancelOrdersUpTo(constants.ZERO_AMOUNT).getABIEncodedTransactionData();
        } else if (fnName === ExchangeFunctionName.PreSign) {
            data = exchangeInstance.preSign(orderHashUtils.getOrderHashHex(orders[0])).getABIEncodedTransactionData();
        } else if (fnName === ExchangeFunctionName.SetSignatureValidatorApproval) {
            data = exchangeInstance
                .setSignatureValidatorApproval(constants.NULL_ADDRESS, true)
                .getABIEncodedTransactionData();
        } else {
            throw new Error(`Error: ${fnName} not a supported function`);
        }
        return data;
    },

public async hardCancelOrderAsync(
        order: Order,
        txData: TxData,
        sendTxOpts: SendTransactionOpts = { shouldValidate: true },
    ): Promise {
        assert.doesConformToSchema('order', order, schemas.orderSchema);
        return this._executeTxThroughCoordinatorAsync(
            ExchangeFunctionName.CancelOrder,
            txData,
            sendTxOpts,
            [order],
            order,
        );
    }