Environment
I am using Truffle v5.0.29, and Solidity v 0.5.0
Details
When testing out my crowdsale, it returns errors saying “revert SafeMath: multiplication overflow – Reason given: SafeMath: multiplication overflow.”
Code to reproduce
const { balance, BN, constants, ether, expectEvent, expectRevert } = require('openzeppelin-test-helpers');
const { ZERO_ADDRESS } = constants;
const { expect } = require('chai');
const Crowdsale = artifacts.require('EduChainCrowdsale');
const SimpleToken = artifacts.require('EduChain');
contract('Crowdsale', function ([_, investor, wallet, purchaser]) {
const rate = new BN(2*10^-9);
const value = new BN(5000);
const tokenSupply = 105000000;
const expectedTokenAmount = rate.mul(value);
it('requires a non-null token', async function () {
await expectRevert(
Crowdsale.new(rate, wallet, ZERO_ADDRESS),
'Crowdsale: token is the zero address'
);
});
context('with token', async function () {
beforeEach(async function () {
this.token = await SimpleToken.new(tokenSupply);
});
it('requires a non-zero rate', async function () {
await expectRevert(
Crowdsale.new(0, wallet, this.token.address), 'Crowdsale: rate is 0'
);
});
it('requires a non-null wallet', async function () {
await expectRevert(
Crowdsale.new(rate, ZERO_ADDRESS, this.token.address), 'Crowdsale: wallet is the zero address'
);
});
context('once deployed', async function () {
beforeEach(async function () {
this.crowdsale = await Crowdsale.new(rate, wallet, this.token.address);
await this.token.transfer(this.crowdsale.address, tokenSupply);
});
describe('accepting payments', function () {
describe('bare payments', function () {
it('should accept payments', async function () {
await this.crowdsale.send(value, { from: purchaser });
});
it('reverts on zero-valued payments', async function () {
await expectRevert(
this.crowdsale.send(0, { from: purchaser }), 'Crowdsale: weiAmount is 0'
);
});
});
describe('buyTokens', function () {
it('should accept payments', async function () {
await this.crowdsale.buyTokens(investor, { value: value, from: purchaser });
});
it('reverts on zero-valued payments', async function () {
await expectRevert(
this.crowdsale.buyTokens(investor, { value: 0, from: purchaser }), 'Crowdsale: weiAmount is 0'
);
});
it('requires a non-null beneficiary', async function () {
await expectRevert(
this.crowdsale.buyTokens(ZERO_ADDRESS, { value: value, from: purchaser }),
'Crowdsale: beneficiary is the zero address'
);
});
});
});
describe('high-level purchase', function () {
it('should log purchase', async function () {
const { logs } = await this.crowdsale.sendTransaction({ value: value, from: investor });
expectEvent.inLogs(logs, 'TokensPurchased', {
purchaser: investor,
beneficiary: investor,
value: value,
amount: expectedTokenAmount,
});
});
it('should assign tokens to sender', async function () {
await this.crowdsale.sendTransaction({ value: value, from: investor });
expect(await this.token.balanceOf(investor)).to.be.bignumber.equal(expectedTokenAmount);
});
it('should forward funds to wallet', async function () {
const balanceTracker = await balance.tracker(wallet);
await this.crowdsale.sendTransaction({ value, from: investor });
expect(await balanceTracker.delta()).to.be.bignumber.equal(value);
});
});
describe('low-level purchase', function () {
it('should log purchase', async function () {
const { logs } = await this.crowdsale.buyTokens(investor, { value: value, from: purchaser });
expectEvent.inLogs(logs, 'TokensPurchased', {
purchaser: purchaser,
beneficiary: investor,
value: value,
amount: expectedTokenAmount,
});
});
it('should assign tokens to beneficiary', async function () {
await this.crowdsale.buyTokens(investor, { value, from: purchaser });
expect(await this.token.balanceOf(investor)).to.be.bignumber.equal(expectedTokenAmount);
});
it('should forward funds to wallet', async function () {
const balanceTracker = await balance.tracker(wallet);
await this.crowdsale.buyTokens(investor, { value, from: purchaser });
expect(await balanceTracker.delta()).to.be.bignumber.equal(value);
});
});
});
});
});