import { chaiSetup, constants, expectContractCallFailedAsync, provider, txDefaults, web3Wrapper, } from '@0x/contracts-test-utils'; import { BlockchainLifecycle } from '@0x/dev-utils'; import { RevertReason } from '@0x/types'; import { BigNumber } from '@0x/utils'; import * as chai from 'chai'; import { artifacts, DummyERC20TokenContract } from '../src'; chaiSetup.configure(); const expect = chai.expect; const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper); describe('UnlimitedAllowanceToken', () => { let owner: string; let spender: string; const MAX_MINT_VALUE = new BigNumber(10000000000000000000000); 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.awaitTransactionSuccessAsync( await token.mint.sendTransactionAsync(MAX_MINT_VALUE, { from: owner }), constants.AWAIT_TRANSACTION_MINED_MS, ); }); beforeEach(async () => { await blockchainLifecycle.startAsync(); }); afterEach(async () => { await blockchainLifecycle.revertAsync(); }); describe('transfer', () => { it('should throw if owner has insufficient balance', async () => { const ownerBalance = await token.balanceOf.callAsync(owner); const amountToTransfer = ownerBalance.plus(1); return expectContractCallFailedAsync( token.transfer.callAsync(spender, amountToTransfer, { from: owner }), RevertReason.Erc20InsufficientBalance, ); }); it('should transfer balance from sender to receiver', async () => { const receiver = spender; const initOwnerBalance = await token.balanceOf.callAsync(owner); const amountToTransfer = new BigNumber(1); await web3Wrapper.awaitTransactionSuccessAsync( await token.transfer.sendTransactionAsync(receiver, amountToTransfer, { from: owner }), constants.AWAIT_TRANSACTION_MINED_MS, ); const finalOwnerBalance = await token.balanceOf.callAsync(owner); const finalReceiverBalance = await token.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 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 token.balanceOf.callAsync(owner); const amountToTransfer = ownerBalance.plus(1); await web3Wrapper.awaitTransactionSuccessAsync( await token.approve.sendTransactionAsync(spender, amountToTransfer, { from: owner }), constants.AWAIT_TRANSACTION_MINED_MS, ); return expectContractCallFailedAsync( token.transferFrom.callAsync(owner, spender, amountToTransfer, { from: spender, }), RevertReason.Erc20InsufficientBalance, ); }); it('should throw if spender has insufficient allowance', async () => { const ownerBalance = await token.balanceOf.callAsync(owner); const amountToTransfer = ownerBalance; const spenderAllowance = await token.allowance.callAsync(owner, spender); const isSpenderAllowanceInsufficient = spenderAllowance.cmp(amountToTransfer) < 0; expect(isSpenderAllowanceInsufficient).to.be.true(); return expectContractCallFailedAsync( token.transferFrom.callAsync(owner, spender, amountToTransfer, { from: spender, }), RevertReason.Erc20InsufficientAllowance, ); }); 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 token.balanceOf.callAsync(owner); const amountToTransfer = initOwnerBalance; const initSpenderAllowance = constants.UNLIMITED_ALLOWANCE_IN_BASE_UNITS; await web3Wrapper.awaitTransactionSuccessAsync( await token.approve.sendTransactionAsync(spender, initSpenderAllowance, { from: owner }), constants.AWAIT_TRANSACTION_MINED_MS, ); await web3Wrapper.awaitTransactionSuccessAsync( await token.transferFrom.sendTransactionAsync(owner, spender, amountToTransfer, { from: spender, gas: constants.MAX_TOKEN_TRANSFERFROM_GAS, }), constants.AWAIT_TRANSACTION_MINED_MS, ); const newSpenderAllowance = await token.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 token.balanceOf.callAsync(owner); const amountToTransfer = initOwnerBalance; const initSpenderAllowance = initOwnerBalance; await web3Wrapper.awaitTransactionSuccessAsync( await token.approve.sendTransactionAsync(spender, initSpenderAllowance, { from: owner }), constants.AWAIT_TRANSACTION_MINED_MS, ); await web3Wrapper.awaitTransactionSuccessAsync( await token.transferFrom.sendTransactionAsync(owner, spender, amountToTransfer, { from: spender, gas: constants.MAX_TOKEN_TRANSFERFROM_GAS, }), constants.AWAIT_TRANSACTION_MINED_MS, ); const newOwnerBalance = await token.balanceOf.callAsync(owner); const newSpenderBalance = await token.balanceOf.callAsync(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 token.balanceOf.callAsync(owner); const amountToTransfer = initOwnerBalance; const initSpenderAllowance = initOwnerBalance; await web3Wrapper.awaitTransactionSuccessAsync( await token.approve.sendTransactionAsync(spender, initSpenderAllowance, { from: owner }), constants.AWAIT_TRANSACTION_MINED_MS, ); await web3Wrapper.awaitTransactionSuccessAsync( await token.transferFrom.sendTransactionAsync(owner, spender, amountToTransfer, { from: spender, gas: constants.MAX_TOKEN_TRANSFERFROM_GAS, }), constants.AWAIT_TRANSACTION_MINED_MS, ); const newSpenderAllowance = await token.allowance.callAsync(owner, spender); expect(newSpenderAllowance).to.be.bignumber.equal(0); }); }); });