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import { BlockchainLifecycle, devConstants, web3Factory } from '@0xproject/dev-utils';
import { BigNumber } from '@0xproject/utils';
import { Web3Wrapper } from '@0xproject/web3-wrapper';
import * as chai from 'chai';
import 'make-promises-safe';
import * as Web3 from 'web3';
import { ZRXTokenContract } from '../src/contract_wrappers/generated/zrx_token';
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('ZRXToken', () => {
let owner: string;
let spender: string;
let MAX_UINT: BigNumber;
let zrxToken: ZRXTokenContract;
before(async () => {
const accounts = await web3Wrapper.getAvailableAddressesAsync();
owner = accounts[0];
spender = accounts[1];
zrxToken = await ZRXTokenContract.deployFrom0xArtifactAsync(artifacts.ZRX, provider, txDefaults);
MAX_UINT = constants.UNLIMITED_ALLOWANCE_IN_BASE_UNITS;
});
beforeEach(async () => {
await blockchainLifecycle.startAsync();
});
afterEach(async () => {
await blockchainLifecycle.revertAsync();
});
describe('constants', () => {
it('should have 18 decimals', async () => {
const decimals = new BigNumber(await zrxToken.decimals.callAsync());
const expectedDecimals = 18;
expect(decimals).to.be.bignumber.equal(expectedDecimals);
});
it('should have a total supply of 1 billion tokens', async () => {
const totalSupply = new BigNumber(await zrxToken.totalSupply.callAsync());
const expectedTotalSupply = 1000000000;
expect(Web3Wrapper.toUnitAmount(totalSupply, 18)).to.be.bignumber.equal(expectedTotalSupply);
});
it('should be named 0x Protocol Token', async () => {
const name = await zrxToken.name.callAsync();
const expectedName = '0x Protocol Token';
expect(name).to.be.equal(expectedName);
});
it('should have the symbol ZRX', async () => {
const symbol = await zrxToken.symbol.callAsync();
const expectedSymbol = 'ZRX';
expect(symbol).to.be.equal(expectedSymbol);
});
});
describe('constructor', () => {
it('should initialize owner balance to totalSupply', async () => {
const ownerBalance = await zrxToken.balanceOf.callAsync(owner);
const totalSupply = new BigNumber(await zrxToken.totalSupply.callAsync());
expect(totalSupply).to.be.bignumber.equal(ownerBalance);
});
});
describe('transfer', () => {
it('should transfer balance from sender to receiver', async () => {
const receiver = spender;
const initOwnerBalance = await zrxToken.balanceOf.callAsync(owner);
const amountToTransfer = new BigNumber(1);
await zrxToken.transfer.sendTransactionAsync(receiver, amountToTransfer, { from: owner });
const finalOwnerBalance = await zrxToken.balanceOf.callAsync(owner);
const finalReceiverBalance = await zrxToken.balanceOf.callAsync(receiver);
const expectedFinalOwnerBalance = initOwnerBalance.minus(amountToTransfer);
const expectedFinalReceiverBalance = amountToTransfer;
expect(finalOwnerBalance).to.be.bignumber.equal(expectedFinalOwnerBalance);
expect(finalReceiverBalance).to.be.bignumber.equal(expectedFinalReceiverBalance);
});
it('should return true on a 0 value transfer', async () => {
const didReturnTrue = await zrxToken.transfer.callAsync(spender, new BigNumber(0), {
from: owner,
});
expect(didReturnTrue).to.be.true();
});
});
describe('transferFrom', () => {
it('should return false if owner has insufficient balance', async () => {
const ownerBalance = await zrxToken.balanceOf.callAsync(owner);
const amountToTransfer = ownerBalance.plus(1);
await zrxToken.approve.sendTransactionAsync(spender, amountToTransfer, {
from: owner,
gas: constants.MAX_TOKEN_APPROVE_GAS,
});
const didReturnTrue = await zrxToken.transferFrom.callAsync(owner, spender, amountToTransfer, {
from: spender,
});
expect(didReturnTrue).to.be.false();
});
it('should return false if spender has insufficient allowance', async () => {
const ownerBalance = await zrxToken.balanceOf.callAsync(owner);
const amountToTransfer = ownerBalance;
const spenderAllowance = await zrxToken.allowance.callAsync(owner, spender);
const isSpenderAllowanceInsufficient = spenderAllowance.cmp(amountToTransfer) < 0;
expect(isSpenderAllowanceInsufficient).to.be.true();
const didReturnTrue = await zrxToken.transferFrom.callAsync(owner, spender, amountToTransfer, {
from: spender,
});
expect(didReturnTrue).to.be.false();
});
it('should return true on a 0 value transfer', async () => {
const amountToTransfer = new BigNumber(0);
const didReturnTrue = await zrxToken.transferFrom.callAsync(owner, spender, amountToTransfer, {
from: spender,
});
expect(didReturnTrue).to.be.true();
});
it('should not modify spender allowance if spender allowance is 2^256 - 1', async () => {
const initOwnerBalance = await zrxToken.balanceOf.callAsync(owner);
const amountToTransfer = initOwnerBalance;
const initSpenderAllowance = MAX_UINT;
await zrxToken.approve.sendTransactionAsync(spender, initSpenderAllowance, {
from: owner,
gas: constants.MAX_TOKEN_APPROVE_GAS,
});
await zrxToken.transferFrom.sendTransactionAsync(owner, spender, amountToTransfer, {
from: spender,
gas: constants.MAX_TOKEN_TRANSFERFROM_GAS,
});
const newSpenderAllowance = await zrxToken.allowance.callAsync(owner, spender);
expect(initSpenderAllowance).to.be.bignumber.equal(newSpenderAllowance);
});
it('should transfer the correct balances if spender has sufficient allowance', async () => {
const initOwnerBalance = await zrxToken.balanceOf.callAsync(owner);
const initSpenderBalance = await zrxToken.balanceOf.callAsync(spender);
const amountToTransfer = initOwnerBalance;
const initSpenderAllowance = initOwnerBalance;
await zrxToken.approve.sendTransactionAsync(spender, initSpenderAllowance);
await zrxToken.transferFrom.sendTransactionAsync(owner, spender, amountToTransfer, {
from: spender,
gas: constants.MAX_TOKEN_TRANSFERFROM_GAS,
});
const newOwnerBalance = await zrxToken.balanceOf.callAsync(owner);
const newSpenderBalance = await zrxToken.balanceOf.callAsync(spender);
expect(newOwnerBalance).to.be.bignumber.equal(0);
expect(newSpenderBalance).to.be.bignumber.equal(initSpenderBalance.plus(initOwnerBalance));
});
it('should modify allowance if spender has sufficient allowance less than 2^256 - 1', async () => {
const initOwnerBalance = await zrxToken.balanceOf.callAsync(owner);
const amountToTransfer = initOwnerBalance;
await zrxToken.approve.sendTransactionAsync(spender, amountToTransfer);
await zrxToken.transferFrom.sendTransactionAsync(owner, spender, amountToTransfer, {
from: spender,
gas: constants.MAX_TOKEN_TRANSFERFROM_GAS,
});
const newSpenderAllowance = await zrxToken.allowance.callAsync(owner, spender);
expect(newSpenderAllowance).to.be.bignumber.equal(0);
});
});
});
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