feat(order_utils.py): ERC721 asset data codec (#1186)

packages/order-utils/test/asset_data_utils_test.ts

@@ -1,6 +1,7 @@
 import * as chai from 'chai';
 
-import { ERC20AssetData } from '@0x/types';
+import { ERC20AssetData, ERC721AssetData } from '@0x/types';
+import { BigNumber } from '@0x/utils';
 
 import { assetDataUtils } from '../src/asset_data_utils';
 
@@ -14,18 +15,36 @@ const KNOWN_ENCODINGS = [
         address: '0x1dc4c1cefef38a777b15aa20260a54e584b16c48',
         assetData: '0xf47261b00000000000000000000000001dc4c1cefef38a777b15aa20260a54e584b16c48',
     },
+    {
+        address: '0x1dc4c1cefef38a777b15aa20260a54e584b16c48',
+        tokenId: new BigNumber(1),
+        assetData:
+            '0x025717920000000000000000000000001dc4c1cefef38a777b15aa20260a54e584b16c480000000000000000000000000000000000000000000000000000000000000001',
+    },
 ];
 
 const ERC20_ASSET_PROXY_ID = '0xf47261b0';
+const ERC721_ASSET_PROXY_ID = '0x02571792';
 
 describe('assetDataUtils', () => {
-    it('should encode', () => {
+    it('should encode ERC20', () => {
         const assetData = assetDataUtils.encodeERC20AssetData(KNOWN_ENCODINGS[0].address);
         expect(assetData).to.equal(KNOWN_ENCODINGS[0].assetData);
     });
-    it('should decode', () => {
+    it('should decode ERC20', () => {
         const assetData: ERC20AssetData = assetDataUtils.decodeERC20AssetData(KNOWN_ENCODINGS[0].assetData);
         expect(assetData.tokenAddress).to.equal(KNOWN_ENCODINGS[0].address);
         expect(assetData.assetProxyId).to.equal(ERC20_ASSET_PROXY_ID);
     });
+    it('should encode ERC721', () => {
+        const assetData = assetDataUtils.encodeERC721AssetData(KNOWN_ENCODINGS[1].address, KNOWN_ENCODINGS[1]
+            .tokenId as BigNumber);
+        expect(assetData).to.equal(KNOWN_ENCODINGS[1].assetData);
+    });
+    it('should decode ERC721', () => {
+        const assetData: ERC721AssetData = assetDataUtils.decodeERC721AssetData(KNOWN_ENCODINGS[1].assetData);
+        expect(assetData.tokenAddress).to.equal(KNOWN_ENCODINGS[1].address);
+        expect(assetData.assetProxyId).to.equal(ERC721_ASSET_PROXY_ID);
+        expect(assetData.tokenId).to.be.bignumber.equal(KNOWN_ENCODINGS[1].tokenId);
+    });
 });