path: root/packages/contracts/test/ether_token.ts

import { BlockchainLifecycle, devConstants, web3Factory } from '@0xproject/dev-utils';
import { BigNumber, promisify } from '@0xproject/utils';
import { Web3Wrapper } from '@0xproject/web3-wrapper';
import * as chai from 'chai';
import 'make-promises-safe';

import { WETH9Contract } from '../src/contract_wrappers/generated/weth9';
import { artifacts } from '../src/utils/artifacts';
import { chaiSetup } from '../src/utils/chai_setup';
import { constants } from '../src/utils/constants';
import { provider, txDefaults, web3Wrapper } from '../src/utils/web3_wrapper';

chaiSetup.configure();
const expect = chai.expect;
const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);

describe('EtherToken', () => {
    let account: string;
    const gasPrice = Web3Wrapper.toBaseUnitAmount(new BigNumber(20), 9);
    let etherToken: WETH9Contract;

    before(async () => {
        await blockchainLifecycle.startAsync();
    });
    after(async () => {
        await blockchainLifecycle.revertAsync();
    });
    before(async () => {
        const accounts = await web3Wrapper.getAvailableAddressesAsync();
        account = accounts[0];

        etherToken = await WETH9Contract.deployFrom0xArtifactAsync(artifacts.EtherToken, provider, {
            gasPrice,
            ...txDefaults,
        });
    });
    beforeEach(async () => {
        await blockchainLifecycle.startAsync();
    });
    afterEach(async () => {
        await blockchainLifecycle.revertAsync();
    });
    describe('deposit', () => {
        // TODO(albrow):  AssertionError: expected promise to be rejected with an error including 'ender doesn\'t have enough funds to send tx.' but got 'insufficient funds for gas * price + value'
        it.skip('should throw if caller attempts to deposit more Ether than caller balance', async () => {
            const initEthBalance = await web3Wrapper.getBalanceInWeiAsync(account);
            const ethToDeposit = initEthBalance.plus(1);

            return expect(etherToken.deposit.sendTransactionAsync({ value: ethToDeposit })).to.be.rejectedWith(
                "ender doesn't have enough funds to send tx.",
            );
        });

        it('should convert deposited Ether to wrapped Ether tokens', async () => {
            const initEthBalance = await web3Wrapper.getBalanceInWeiAsync(account);
            const initEthTokenBalance = await etherToken.balanceOf.callAsync(account);

            const ethToDeposit = new BigNumber(Web3Wrapper.toWei(new BigNumber(1)));

            const txHash = await etherToken.deposit.sendTransactionAsync({ value: ethToDeposit });
            const receipt = await web3Wrapper.awaitTransactionSuccessAsync(
                txHash,
                constants.AWAIT_TRANSACTION_MINED_MS,
            );

            const ethSpentOnGas = gasPrice.times(receipt.gasUsed);
            const finalEthBalance = await web3Wrapper.getBalanceInWeiAsync(account);
            const finalEthTokenBalance = await etherToken.balanceOf.callAsync(account);

            expect(finalEthBalance).to.be.bignumber.equal(initEthBalance.minus(ethToDeposit.plus(ethSpentOnGas)));
            expect(finalEthTokenBalance).to.be.bignumber.equal(initEthTokenBalance.plus(ethToDeposit));
        });
    });

    describe('withdraw', () => {
        // TODO(albrow): AssertionError: expected promise to be rejected with an error including 'revert' but got 'gas required exceeds allowance or always failing transaction'
        it.skip('should throw if caller attempts to withdraw greater than caller balance', async () => {
            const initEthTokenBalance = await etherToken.balanceOf.callAsync(account);
            const ethTokensToWithdraw = initEthTokenBalance.plus(1);

            return expect(etherToken.withdraw.sendTransactionAsync(ethTokensToWithdraw)).to.be.rejectedWith(
                constants.REVERT,
            );
        });

        it('should convert ether tokens to ether with sufficient balance', async () => {
            const ethToDeposit = new BigNumber(Web3Wrapper.toWei(new BigNumber(1)));
            await web3Wrapper.awaitTransactionSuccessAsync(
                await etherToken.deposit.sendTransactionAsync({ value: ethToDeposit }),
                constants.AWAIT_TRANSACTION_MINED_MS,
            );
            const initEthTokenBalance = await etherToken.balanceOf.callAsync(account);
            const initEthBalance = await web3Wrapper.getBalanceInWeiAsync(account);
            const ethTokensToWithdraw = initEthTokenBalance;
            expect(ethTokensToWithdraw).to.not.be.bignumber.equal(0);
            const txHash = await etherToken.withdraw.sendTransactionAsync(ethTokensToWithdraw, {
                gas: constants.MAX_ETHERTOKEN_WITHDRAW_GAS,
            });
            const receipt = await web3Wrapper.awaitTransactionSuccessAsync(
                txHash,
                constants.AWAIT_TRANSACTION_MINED_MS,
            );

            const ethSpentOnGas = gasPrice.times(receipt.gasUsed);
            const finalEthBalance = await web3Wrapper.getBalanceInWeiAsync(account);
            const finalEthTokenBalance = await etherToken.balanceOf.callAsync(account);

            expect(finalEthBalance).to.be.bignumber.equal(
                initEthBalance.plus(ethTokensToWithdraw.minus(ethSpentOnGas)),
            );
            expect(finalEthTokenBalance).to.be.bignumber.equal(initEthTokenBalance.minus(ethTokensToWithdraw));
        });
    });

    describe('fallback', () => {
        it('should convert sent ether to ether tokens', async () => {
            const initEthBalance = await web3Wrapper.getBalanceInWeiAsync(account);
            const initEthTokenBalance = await etherToken.balanceOf.callAsync(account);

            const ethToDeposit = Web3Wrapper.toBaseUnitAmount(new BigNumber(1), 18);

            const txHash = await web3Wrapper.sendTransactionAsync({
                from: account,
                to: etherToken.address,
                value: ethToDeposit,
                gasPrice,
            });

            const receipt = await web3Wrapper.awaitTransactionSuccessAsync(
                txHash,
                constants.AWAIT_TRANSACTION_MINED_MS,
            );

            const ethSpentOnGas = gasPrice.times(receipt.gasUsed);
            const finalEthBalance = await web3Wrapper.getBalanceInWeiAsync(account);
            const finalEthTokenBalance = await etherToken.balanceOf.callAsync(account);

            expect(finalEthBalance).to.be.bignumber.equal(initEthBalance.minus(ethToDeposit.plus(ethSpentOnGas)));
            expect(finalEthTokenBalance).to.be.bignumber.equal(initEthTokenBalance.plus(ethToDeposit));
        });
    });
});