import { BlockchainLifecycle } 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 { 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 () => { await blockchainLifecycle.startAsync(); }); after(async () => { await blockchainLifecycle.revertAsync(); }); 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); }); }); });