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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.comparedTo(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);
});
});
});
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