Implement EtherTokenWrapper and tests, with deposit and withdraw methods

1 files changed, 99 insertions, 0 deletions

diff --git a/test/ether_token_wrapper_test.ts b/test/ether_token_wrapper_test.ts
new file mode 100644
index 000000000..730b85497
--- /dev/null
+++ b/test/ether_token_wrapper_test.ts
@@ -0,0 +1,99 @@
+import 'mocha';
+import * as chai from 'chai';
+import {chaiSetup} from './utils/chai_setup';
+import * as Web3 from 'web3';
+import * as BigNumber from 'bignumber.js';
+import promisify = require('es6-promisify');
+import {web3Factory} from './utils/web3_factory';
+import {ZeroEx, ZeroExError, Token} from '../src';
+import {BlockchainLifecycle} from './utils/blockchain_lifecycle';
+
+chaiSetup.configure();
+const expect = chai.expect;
+const blockchainLifecycle = new BlockchainLifecycle();
+
+describe.only('EtherTokenWrapper', () => {
+    let web3: Web3;
+    let zeroEx: ZeroEx;
+    let userAddresses: string[];
+    let addressWithETH: string;
+    let wethContractAddress: string;
+    let depositETHAmount: BigNumber.BigNumber;
+    let depositWeiAmount: BigNumber.BigNumber;
+    let decimalPlaces: number;
+    before(async () => {
+        web3 = web3Factory.create();
+        zeroEx = new ZeroEx(web3.currentProvider);
+        userAddresses = await promisify(web3.eth.getAccounts)();
+        addressWithETH = userAddresses[0];
+        wethContractAddress = await zeroEx.etherToken.getContractAddressAsync();
+        depositETHAmount = new BigNumber(5);
+        depositWeiAmount = (zeroEx as any)._web3Wrapper.toWei(depositETHAmount);
+        decimalPlaces = 7;
+    });
+    beforeEach(async () => {
+        await blockchainLifecycle.startAsync();
+    });
+    afterEach(async () => {
+        await blockchainLifecycle.revertAsync();
+    });
+    describe('#depositAsync', () => {
+        it('should successfully deposit ETH and issue Wrapped ETH tokens', async () => {
+            const preETHBalance = await (zeroEx as any)._web3Wrapper.getBalanceInEthAsync(addressWithETH);
+            const preWETHBalance = await zeroEx.token.getBalanceAsync(wethContractAddress, addressWithETH);
+            expect(preETHBalance).to.be.bignumber.gt(0);
+            expect(preWETHBalance).to.be.bignumber.equal(0);
+
+            await zeroEx.etherToken.depositAsync(depositWeiAmount, addressWithETH);
+
+            const postETHBalance = await (zeroEx as any)._web3Wrapper.getBalanceInEthAsync(addressWithETH);
+            const postWETHBalanceInBaseUnits = await zeroEx.token.getBalanceAsync(wethContractAddress, addressWithETH);
+
+            expect(postWETHBalanceInBaseUnits).to.be.bignumber.equal(depositWeiAmount);
+            const remainingETH = preETHBalance.minus(depositETHAmount);
+            return expect(postETHBalance.round(decimalPlaces)).to.be.bignumber.equal(remainingETH);
+        });
+        it('should throw if user has insufficient ETH balance for deposit', async () => {
+            const preETHBalance = await (zeroEx as any)._web3Wrapper.getBalanceInEthAsync(addressWithETH);
+
+            const overETHBalance = preETHBalance.add(5);
+            const overETHBalanceinWei = (zeroEx as any)._web3Wrapper.toWei(overETHBalance);
+
+            return expect(
+                zeroEx.etherToken.depositAsync(overETHBalanceinWei, addressWithETH),
+            ).to.be.rejectedWith(ZeroExError.INSUFFICIENT_ETH_BALANCE_FOR_DEPOSIT);
+        });
+    });
+    describe('#withdrawAsync', () => {
+        it('should successfully withdraw ETH in return for Wrapped ETH tokens', async () => {
+            const ETHBalance = await (zeroEx as any)._web3Wrapper.getBalanceInEthAsync(addressWithETH);
+
+            await zeroEx.etherToken.depositAsync(depositWeiAmount, addressWithETH);
+
+            const expectedPreETHBalance = ETHBalance.minus(depositETHAmount);
+            const preETHBalance = await (zeroEx as any)._web3Wrapper.getBalanceInEthAsync(addressWithETH);
+            const preWETHBalance = await zeroEx.token.getBalanceAsync(wethContractAddress, addressWithETH);
+            expect(preETHBalance.round(decimalPlaces)).to.be.bignumber.equal(expectedPreETHBalance);
+            expect(preWETHBalance).to.be.bignumber.equal(depositWeiAmount);
+
+            await zeroEx.etherToken.withdrawAsync(depositWeiAmount, addressWithETH);
+
+            const postETHBalance = await (zeroEx as any)._web3Wrapper.getBalanceInEthAsync(addressWithETH);
+            const postWETHBalanceInBaseUnits = await zeroEx.token.getBalanceAsync(wethContractAddress, addressWithETH);
+
+            expect(postWETHBalanceInBaseUnits).to.be.bignumber.equal(0);
+            const expectedETHBalance = preETHBalance.add(depositETHAmount).round(decimalPlaces);
+            return expect(postETHBalance.round(decimalPlaces)).to.be.bignumber.equal(expectedETHBalance);
+        });
+        it('should throw if user has insufficient WETH balance for withdrawl', async () => {
+            const preWETHBalance = await zeroEx.token.getBalanceAsync(wethContractAddress, addressWithETH);
+            expect(preWETHBalance).to.be.bignumber.equal(0);
+
+            const overWETHBalance = preWETHBalance.add(999999999);
+
+            return expect(
+                zeroEx.etherToken.withdrawAsync(overWETHBalance, addressWithETH),
+            ).to.be.rejectedWith(ZeroExError.INSUFFICIENT_WETH_BALANCE_FOR_WITHDRAWL);
+        });
+    });
+});