Update file structure

packages/contracts/test/utils/order_factory.ts

@@ -0,0 +1,37 @@
+import { generatePseudoRandomSalt, orderHashUtils } from '@0xproject/order-utils';
+import { Order, SignatureType, SignedOrder } from '@0xproject/types';
+import { BigNumber } from '@0xproject/utils';
+
+import { constants } from './constants';
+import { signingUtils } from './signing_utils';
+
+export class OrderFactory {
+    private _defaultOrderParams: Partial<Order>;
+    private _privateKey: Buffer;
+    constructor(privateKey: Buffer, defaultOrderParams: Partial<Order>) {
+        this._defaultOrderParams = defaultOrderParams;
+        this._privateKey = privateKey;
+    }
+    public newSignedOrder(
+        customOrderParams: Partial<Order> = {},
+        signatureType: SignatureType = SignatureType.EthSign,
+    ): SignedOrder {
+        const tenMinutes = 10 * 60 * 1000;
+        const randomExpiration = new BigNumber(Date.now() + tenMinutes);
+        const order = ({
+            senderAddress: constants.NULL_ADDRESS,
+            expirationTimeSeconds: randomExpiration,
+            salt: generatePseudoRandomSalt(),
+            takerAddress: constants.NULL_ADDRESS,
+            ...this._defaultOrderParams,
+            ...customOrderParams,
+        } as any) as Order;
+        const orderHashBuff = orderHashUtils.getOrderHashBuffer(order);
+        const signature = signingUtils.signMessage(orderHashBuff, this._privateKey, signatureType);
+        const signedOrder = {
+            ...order,
+            signature: `0x${signature.toString('hex')}`,
+        };
+        return signedOrder;
+    }
+}