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import {ZeroEx} from '0x.js';
import {BigNumber} from 'bignumber.js';
import * as chai from 'chai';
import Web3 = require('web3');
import {Artifacts} from '../../util/artifacts';
import {ContractInstance} from '../../util/types';
import {chaiSetup} from './utils/chai_setup';
chaiSetup.configure();
const expect = chai.expect;
const {Exchange, ZRXToken} = new Artifacts(artifacts);
const web3: Web3 = (global as any).web3;
contract('ZRXToken', (accounts: string[]) => {
const owner = accounts[0];
const spender = accounts[1];
let zeroEx: ZeroEx;
let MAX_UINT: BigNumber;
let zrx: ContractInstance;
let zrxAddress: string;
beforeEach(async () => {
zeroEx = new ZeroEx(web3.currentProvider, {
exchangeContractAddress: Exchange.address,
});
zrxAddress = await zeroEx.exchange.getZRXTokenAddressAsync();
zrx = await ZRXToken.at(zrxAddress);
MAX_UINT = zeroEx.token.UNLIMITED_ALLOWANCE_IN_BASE_UNITS;
});
describe('constants', () => {
it('should have 18 decimals', async () => {
const decimals = new BigNumber(await zrx.decimals.call());
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 zrx.totalSupply.call());
const expectedTotalSupply = 1000000000;
expect(ZeroEx.toUnitAmount(totalSupply, 18)).to.be.bignumber.equal(expectedTotalSupply);
});
it('should be named 0x Protocol Token', async () => {
const name = await zrx.name.call();
const expectedName = '0x Protocol Token';
expect(name).to.be.equal(expectedName);
});
it('should have the symbol ZRX', async () => {
const symbol = await zrx.symbol.call();
const expectedSymbol = 'ZRX';
expect(symbol).to.be.equal(expectedSymbol);
});
});
describe('constructor', () => {
it('should initialize owner balance to totalSupply', async () => {
const ownerBalance = await zeroEx.token.getBalanceAsync(zrxAddress, owner);
const totalSupply = new BigNumber(await zrx.totalSupply.call());
expect(totalSupply).to.be.bignumber.equal(ownerBalance);
});
});
describe('transfer', () => {
it('should transfer balance from sender to receiver', async () => {
const receiver = spender;
const initOwnerBalance = await zeroEx.token.getBalanceAsync(zrxAddress, owner);
const amountToTransfer = new BigNumber(1);
const txHash = await zeroEx.token.transferAsync(zrxAddress, owner, receiver, amountToTransfer);
await zeroEx.awaitTransactionMinedAsync(txHash);
const finalOwnerBalance = await zeroEx.token.getBalanceAsync(zrxAddress, owner);
const finalReceiverBalance = await zeroEx.token.getBalanceAsync(zrxAddress, 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 zrx.transfer.call(spender, 0, {from: owner});
expect(didReturnTrue).to.be.true();
});
});
describe('transferFrom', () => {
it('should return false if owner has insufficient balance', async () => {
const ownerBalance = await zeroEx.token.getBalanceAsync(zrxAddress, owner);
const amountToTransfer = ownerBalance.plus(1);
let txHash = await zeroEx.token.setAllowanceAsync(zrxAddress, owner, spender, amountToTransfer);
await zeroEx.awaitTransactionMinedAsync(txHash);
const didReturnTrue = await zrx.transferFrom.call(owner, spender, amountToTransfer, {from: spender});
expect(didReturnTrue).to.be.false();
// Reset allowance
txHash = await zeroEx.token.setAllowanceAsync(zrxAddress, owner, spender, new BigNumber(0));
await zeroEx.awaitTransactionMinedAsync(txHash);
});
it('should return false if spender has insufficient allowance', async () => {
const ownerBalance = await zeroEx.token.getBalanceAsync(zrxAddress, owner);
const amountToTransfer = ownerBalance;
const spenderAllowance = await zeroEx.token.getAllowanceAsync(zrxAddress, owner, spender);
const spenderAllowanceIsInsufficient = spenderAllowance.cmp(amountToTransfer) < 0;
expect(spenderAllowanceIsInsufficient).to.be.true();
const didReturnTrue = await zrx.transferFrom.call(owner, spender, amountToTransfer, {from: spender});
expect(didReturnTrue).to.be.false();
});
it('should return true on a 0 value transfer', async () => {
const amountToTransfer = 0;
const didReturnTrue = await zrx.transferFrom.call(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 zeroEx.token.getBalanceAsync(zrxAddress, owner);
const amountToTransfer = initOwnerBalance;
const initSpenderAllowance = MAX_UINT;
let txHash = await zeroEx.token.setAllowanceAsync(zrxAddress, owner, spender, initSpenderAllowance);
await zeroEx.awaitTransactionMinedAsync(txHash);
txHash = await zeroEx.token.transferFromAsync(zrxAddress, owner, spender, spender, amountToTransfer);
await zeroEx.awaitTransactionMinedAsync(txHash);
const newSpenderAllowance = await zeroEx.token.getAllowanceAsync(zrxAddress, owner, spender);
expect(initSpenderAllowance).to.be.bignumber.equal(newSpenderAllowance);
// Restore balance
txHash = await zeroEx.token.transferAsync(zrxAddress, spender, owner, amountToTransfer);
await zeroEx.awaitTransactionMinedAsync(txHash);
});
it('should transfer the correct balances if spender has sufficient allowance', async () => {
const initOwnerBalance = await zeroEx.token.getBalanceAsync(zrxAddress, owner);
const initSpenderBalance = await zeroEx.token.getBalanceAsync(zrxAddress, spender);
const amountToTransfer = initOwnerBalance;
const initSpenderAllowance = initOwnerBalance;
let txHash = await zeroEx.token.setAllowanceAsync(zrxAddress, owner, spender, initSpenderAllowance);
await zeroEx.awaitTransactionMinedAsync(txHash);
txHash = await zeroEx.token.transferFromAsync(zrxAddress, owner, spender, spender, amountToTransfer);
await zeroEx.awaitTransactionMinedAsync(txHash);
const newOwnerBalance = await zeroEx.token.getBalanceAsync(zrxAddress, owner);
const newSpenderBalance = await zeroEx.token.getBalanceAsync(zrxAddress, 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 zeroEx.token.getBalanceAsync(zrxAddress, owner);
const amountToTransfer = initOwnerBalance;
const initSpenderAllowance = initOwnerBalance;
let txHash = await zeroEx.token.setAllowanceAsync(zrxAddress, owner, spender, initSpenderAllowance);
await zeroEx.awaitTransactionMinedAsync(txHash);
txHash = await zeroEx.token.transferFromAsync(zrxAddress, owner, spender, spender, amountToTransfer);
await zeroEx.awaitTransactionMinedAsync(txHash);
const newSpenderAllowance = await zeroEx.token.getAllowanceAsync(zrxAddress, owner, spender);
expect(newSpenderAllowance).to.be.bignumber.equal(0);
});
});
});
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