hello everyone.
so i am trying my hands on creating a token and a crowdsale (default) with openzeppelin v2.5.1.
i transferred the crowdsale token from the owner into the crowdsale token successfully.
i get the below error any time i try to buy tokens.
Error: Returned error: VM Exception while processing transaction: revert SafeERC20: low-level call failed
i tried researching around but most of the solutions around was because the crowdsale didnt have enough tokens but in this case, it is not so. unless i am not seeing something right.
kindly assist.
MUL TOKEN.SOL
pragma solidity ^0.5.16;
import “@openzeppelin/contracts/token/ERC20/ERC20.sol”;
import “@openzeppelin/contracts/token/ERC20/ERC20Detailed.sol”;
import “@openzeppelin/contracts/token/ERC20/ERC20Pausable.sol”;
contract MulToken is ERC20, ERC20Detailed{
constructor()
ERC20Detailed("Mul Token", "MUL", 18) public{
_mint(msg.sender, 100000000); //mint total number of token TO ADMIN
//pause();
}
}
MUL CROWDSALE .SOL
pragma solidity ^0.5.16;
import "@openzeppelin/contracts/crowdsale/Crowdsale.sol";
import "@openzeppelin/contracts/crowdsale/emission/AllowanceCrowdsale.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
contract MulTokenCrowdSale is Crowdsale{
constructor(uint256 _rate,address payable _wallet, IERC20 _token)
Crowdsale(_rate,_wallet,_token) public{
}
}
TEST.JS
const {BN,ether } = require('@openzeppelin/test-helpers');
const { expect } = require('chai');
const MulToken = artifacts.require('MulToken');
const MulTokenCrowdSale = artifacts.require('MulTokenCrowdSale');
contract('MulTokenCrowdSale', function(accounts){
beforeEach(async function(){
this.rate = new BN(110);
this.value = 420000000000000000;
// this.expectedTokenAmount = rate.mul(value);
// this.tokenAllowance = new BN('10').pow(new BN('22'));
this.tokenWallet = accounts[1];
this.wallet = accounts[2];
this.buyer = accounts[3];
this.token = await MulToken.new({ from: accounts[0] });
this.crowdsale = await MulTokenCrowdSale.new(
this.rate,this.wallet,this.token.address
);
await this.token.transfer(this.crowdsale.address, 20000000);
});
describe('accepting payments', function () {
it('should create crowdsale with correct parameters', async function () {
expect(new BN(await this.crowdsale.rate())).to.be.bignumber.equal(this.rate);
expect(await this.crowdsale.wallet()).to.be.equal(this.wallet);
expect(await this.crowdsale.token()).to.be.equal(this.token.address);
});
it('should accept payments', async function () {
const investmentAmount = ether('1');
console.log(investmentAmount);
const expectedTokenAmount = this.rate.mul(investmentAmount);
await this.crowdsale.buyTokens(accounts[8], { value: investmentAmount, from: accounts[8] });
expect(await this.token.balanceOf(accounts[8])).to.be.bignumber.equal(expectedTokenAmount);
});
});
});