import { ZeroEx } from '0x.js'; import { BigNumber } from 'bignumber.js'; import * as chai from 'chai'; import * as Web3 from 'web3'; import { Artifacts } from '../../util/artifacts'; import { constants } from '../../util/constants'; import { ContractInstance } from '../../util/types'; import { chaiSetup } from './utils/chai_setup'; const { DummyToken } = new Artifacts(artifacts); const web3: Web3 = (global as any).web3; chaiSetup.configure(); const expect = chai.expect; contract('UnlimitedAllowanceToken', (accounts: string[]) => { const config = { networkId: constants.TESTRPC_NETWORK_ID, }; const zeroEx = new ZeroEx(web3.currentProvider, config); const owner = accounts[0]; const spender = accounts[1]; const MAX_MINT_VALUE = new BigNumber(100000000000000000000); let tokenAddress: string; let token: ContractInstance; beforeEach(async () => { token = await DummyToken.new({ from: owner }); await token.mint(MAX_MINT_VALUE, { from: owner }); tokenAddress = token.address; }); describe('transfer', () => { it('should transfer balance from sender to receiver', async () => { const receiver = spender; const initOwnerBalance = await zeroEx.token.getBalanceAsync(tokenAddress, owner); const amountToTransfer = new BigNumber(1); await zeroEx.token.transferAsync(tokenAddress, owner, receiver, amountToTransfer); const finalOwnerBalance = await zeroEx.token.getBalanceAsync(tokenAddress, owner); const finalReceiverBalance = await zeroEx.token.getBalanceAsync(tokenAddress, 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 token.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(tokenAddress, owner); const amountToTransfer = ownerBalance.plus(1); await zeroEx.token.setAllowanceAsync(tokenAddress, owner, spender, amountToTransfer); const didReturnTrue = await token.transferFrom.call(owner, spender, amountToTransfer, { from: spender }); expect(didReturnTrue).to.be.false(); }); it('should return false if spender has insufficient allowance', async () => { const ownerBalance = await zeroEx.token.getBalanceAsync(tokenAddress, owner); const amountToTransfer = ownerBalance; const spenderAllowance = await zeroEx.token.getAllowanceAsync(tokenAddress, owner, spender); const spenderAllowanceIsInsufficient = spenderAllowance.cmp(amountToTransfer) < 0; expect(spenderAllowanceIsInsufficient).to.be.true(); const didReturnTrue = await token.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 token.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(tokenAddress, owner); const amountToTransfer = initOwnerBalance; const initSpenderAllowance = zeroEx.token.UNLIMITED_ALLOWANCE_IN_BASE_UNITS; await zeroEx.token.setAllowanceAsync(tokenAddress, owner, spender, initSpenderAllowance); await zeroEx.token.transferFromAsync(tokenAddress, owner, spender, spender, amountToTransfer, { gasLimit: constants.MAX_TOKEN_TRANSFERFROM_GAS, }); const newSpenderAllowance = await zeroEx.token.getAllowanceAsync(tokenAddress, owner, spender); expect(initSpenderAllowance).to.be.bignumber.equal(newSpenderAllowance); }); it('should transfer the correct balances if spender has sufficient allowance', async () => { const initOwnerBalance = await zeroEx.token.getBalanceAsync(tokenAddress, owner); const amountToTransfer = initOwnerBalance; const initSpenderAllowance = initOwnerBalance; await zeroEx.token.setAllowanceAsync(tokenAddress, owner, spender, initSpenderAllowance); await zeroEx.token.transferFromAsync(tokenAddress, owner, spender, spender, amountToTransfer, { gasLimit: constants.MAX_TOKEN_TRANSFERFROM_GAS, }); const newOwnerBalance = await zeroEx.token.getBalanceAsync(tokenAddress, owner); const newSpenderBalance = await zeroEx.token.getBalanceAsync(tokenAddress, spender); expect(newOwnerBalance).to.be.bignumber.equal(0); expect(newSpenderBalance).to.be.bignumber.equal(initOwnerBalance); }); it('should modify allowance if spender has sufficient allowance less than 2^256 - 1', async () => { const initOwnerBalance = await zeroEx.token.getBalanceAsync(tokenAddress, owner); const amountToTransfer = initOwnerBalance; const initSpenderAllowance = initOwnerBalance; await zeroEx.token.setAllowanceAsync(tokenAddress, owner, spender, initSpenderAllowance); await zeroEx.token.transferFromAsync(tokenAddress, owner, spender, spender, amountToTransfer, { gasLimit: constants.MAX_TOKEN_TRANSFERFROM_GAS, }); const newSpenderAllowance = await zeroEx.token.getAllowanceAsync(tokenAddress, owner, spender); expect(newSpenderAllowance).to.be.bignumber.equal(0); }); }); });