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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('ERC20Token', (accounts: string[]) => {
const zeroEx = new ZeroEx(web3.currentProvider);
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 throw if owner has insufficient balance', async () => {
const ownerBalance = await zeroEx.token.getBalanceAsync(tokenAddress, owner);
const amountToTransfer = ownerBalance.plus(1);
return expect(token.transfer.call(owner, spender, amountToTransfer, {from: spender}))
.to.be.rejectedWith(constants.REVERT);
});
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 throw 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);
return expect(token.transferFrom.call(owner, spender, amountToTransfer, {from: spender}))
.to.be.rejectedWith(constants.REVERT);
});
it('should throw 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();
return expect(token.transferFrom.call(owner, spender, amountToTransfer, {from: spender}))
.to.be.rejectedWith(constants.REVERT);
});
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);
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);
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);
const newSpenderAllowance = await zeroEx.token.getAllowanceAsync(tokenAddress, owner, spender);
expect(newSpenderAllowance).to.be.bignumber.equal(0);
});
});
});
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