Add tests for getBalanceAsync

test/erc20_wrapper_test.ts

@@ -0,0 +1,55 @@
+import 'mocha';
+import * as chai from 'chai';
+import chaiAsPromised = require('chai-as-promised');
+import * as Web3 from 'web3';
+import * as BigNumber from 'bignumber.js';
+import promisify = require('es6-promisify');
+import {web3Factory} from './utils/web3_factory';
+import {ZeroEx} from '../src/0x.js';
+import {ZeroExError, Token} from '../src/types';
+import {BlockchainLifecycle} from './utils/blockchain_lifecycle';
+
+const expect = chai.expect;
+chai.use(chaiAsPromised);
+const blockchainLifecycle = new BlockchainLifecycle();
+
+describe('ERC20Wrapper', () => {
+    let web3: Web3;
+    let zeroEx: ZeroEx;
+    let userAddresses: string[];
+    let tokens: Token[];
+    before(async () => {
+        web3 = web3Factory.create();
+        zeroEx = new ZeroEx(web3);
+        userAddresses = await promisify(web3.eth.getAccounts)();
+        tokens = await zeroEx.tokenRegistry.getTokensAsync();
+    });
+    beforeEach(async () => {
+        await blockchainLifecycle.startAsync();
+    });
+    afterEach(async () => {
+        await blockchainLifecycle.revertAsync();
+    });
+    describe('#getBalanceAsync', () => {
+        it('should return the balance for an existing ERC20 token', async () => {
+            const aToken = tokens[0];
+            const aOwnerAddress = userAddresses[0];
+            const balance = await zeroEx.erc20.getBalanceAsync(aToken.address, aOwnerAddress);
+            const expectedBalance = new BigNumber('100000000000000000000000000');
+            expect(balance).to.be.bignumber.equal(expectedBalance);
+        });
+        it ('should throw a CONTRACT_DOES_NOT_EXIST error for a non-existent token contract', async () => {
+            const nonExistentTokenAddress = '0x9dd402f14d67e001d8efbe6583e51bf9706aa065';
+            const aOwnerAddress = userAddresses[0];
+            expect(zeroEx.erc20.getBalanceAsync(nonExistentTokenAddress, aOwnerAddress))
+                .to.be.rejectedWith(ZeroExError.CONTRACT_DOES_NOT_EXIST);
+        });
+        it ('should return a balance of 0 for a non-existent owner address', async () => {
+            const aToken = tokens[0];
+            const aNonExistentOwner = '0x198C6Ad858F213Fb31b6FE809E25040E6B964593';
+            const balance = await zeroEx.erc20.getBalanceAsync(aToken.address, aNonExistentOwner);
+            const expectedBalance = new BigNumber('0');
+            expect(balance).to.be.bignumber.equal(expectedBalance);
+        });
+    });
+});