import { ContractWrappers } from '@0xproject/contract-wrappers'; 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 { DummyERC20TokenContract } from '../src/contract_wrappers/generated/dummy_e_r_c20_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('UnlimitedAllowanceToken', () => { let owner: string; let spender: string; const contractWrappers = new ContractWrappers(provider, { networkId: constants.TESTRPC_NETWORK_ID, }); const MAX_MINT_VALUE = new BigNumber(100000000000000000000); let tokenAddress: string; let token: DummyERC20TokenContract; before(async () => { await blockchainLifecycle.startAsync(); }); after(async () => { await blockchainLifecycle.revertAsync(); }); before(async () => { const accounts = await web3Wrapper.getAvailableAddressesAsync(); owner = accounts[0]; spender = accounts[1]; token = await DummyERC20TokenContract.deployFrom0xArtifactAsync( artifacts.DummyERC20Token, provider, txDefaults, constants.DUMMY_TOKEN_NAME, constants.DUMMY_TOKEN_SYMBOL, constants.DUMMY_TOKEN_DECIMALS, constants.DUMMY_TOKEN_TOTAL_SUPPLY, ); await web3Wrapper.awaitTransactionMinedAsync( await token.mint.sendTransactionAsync(MAX_MINT_VALUE, { from: owner }), constants.AWAIT_TRANSACTION_MINED_MS, ); tokenAddress = token.address; }); beforeEach(async () => { await blockchainLifecycle.startAsync(); }); afterEach(async () => { await blockchainLifecycle.revertAsync(); }); describe('transfer', () => { it('should throw if owner has insufficient balance', async () => { const ownerBalance = await contractWrappers.token.getBalanceAsync(tokenAddress, owner); const amountToTransfer = ownerBalance.plus(1); return expect(token.transfer.callAsync(spender, amountToTransfer, { from: owner })).to.be.rejectedWith( constants.REVERT, ); }); it('should transfer balance from sender to receiver', async () => { const receiver = spender; const initOwnerBalance = await contractWrappers.token.getBalanceAsync(tokenAddress, owner); const amountToTransfer = new BigNumber(1); await contractWrappers.token.transferAsync(tokenAddress, owner, receiver, amountToTransfer); const finalOwnerBalance = await contractWrappers.token.getBalanceAsync(tokenAddress, owner); const finalReceiverBalance = await contractWrappers.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.callAsync(spender, new BigNumber(0), { from: owner, }); expect(didReturnTrue).to.be.true(); }); }); describe('transferFrom', () => { it('should throw if owner has insufficient balance', async () => { const ownerBalance = await contractWrappers.token.getBalanceAsync(tokenAddress, owner); const amountToTransfer = ownerBalance.plus(1); await contractWrappers.token.setAllowanceAsync(tokenAddress, owner, spender, amountToTransfer); return expect( token.transferFrom.callAsync(owner, spender, amountToTransfer, { from: spender, }), ).to.be.rejectedWith(constants.REVERT); }); it('should throw if spender has insufficient allowance', async () => { const ownerBalance = await contractWrappers.token.getBalanceAsync(tokenAddress, owner); const amountToTransfer = ownerBalance; const spenderAllowance = await contractWrappers.token.getAllowanceAsync(tokenAddress, owner, spender); const isSpenderAllowanceInsufficient = spenderAllowance.cmp(amountToTransfer) < 0; expect(isSpenderAllowanceInsufficient).to.be.true(); return expect( token.transferFrom.callAsync(owner, spender, amountToTransfer, { from: spender, }), ).to.be.rejectedWith(constants.REVERT); }); it('should return true on a 0 value transfer', async () => { const amountToTransfer = new BigNumber(0); const didReturnTrue = await token.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 contractWrappers.token.getBalanceAsync(tokenAddress, owner); const amountToTransfer = initOwnerBalance; const initSpenderAllowance = contractWrappers.token.UNLIMITED_ALLOWANCE_IN_BASE_UNITS; await contractWrappers.token.setAllowanceAsync(tokenAddress, owner, spender, initSpenderAllowance); await contractWrappers.token.transferFromAsync(tokenAddress, owner, spender, spender, amountToTransfer, { gasLimit: constants.MAX_TOKEN_TRANSFERFROM_GAS, }); const newSpenderAllowance = await contractWrappers.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 contractWrappers.token.getBalanceAsync(tokenAddress, owner); const amountToTransfer = initOwnerBalance; const initSpenderAllowance = initOwnerBalance; await contractWrappers.token.setAllowanceAsync(tokenAddress, owner, spender, initSpenderAllowance); await contractWrappers.token.transferFromAsync(tokenAddress, owner, spender, spender, amountToTransfer, { gasLimit: constants.MAX_TOKEN_TRANSFERFROM_GAS, }); const newOwnerBalance = await contractWrappers.token.getBalanceAsync(tokenAddress, owner); const newSpenderBalance = await contractWrappers.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 contractWrappers.token.getBalanceAsync(tokenAddress, owner); const amountToTransfer = initOwnerBalance; const initSpenderAllowance = initOwnerBalance; await contractWrappers.token.setAllowanceAsync(tokenAddress, owner, spender, initSpenderAllowance); await contractWrappers.token.transferFromAsync(tokenAddress, owner, spender, spender, amountToTransfer, { gasLimit: constants.MAX_TOKEN_TRANSFERFROM_GAS, }); const newSpenderAllowance = await contractWrappers.token.getAllowanceAsync(tokenAddress, owner, spender); expect(newSpenderAllowance).to.be.bignumber.equal(0); }); }); });