I have followed both answers in the following similar question. I some how cannot seem to get a non-zero result. I tried several different ways to modify the below conversion function. Using MockV3Aggregator in hardhat network, test running correctly pre-conversion. Can anyone see my problem? Thank you.
Similar question: price conversion using chainlink ETHUSD price
My code:
pragma solidity ^0.8.0;
import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
int256 public usdPrice; // set to 10 in the constructor
...
function getLatestPrice() public view returns (int256) {
(, int256 answer, , , ) = s_priceFeed.latestRoundData();
// ETH/USD rate in 18 digit
return answer;
}
function conversion() public view returns (int) {
int minRequiredUSD = usdPrice * 10 ** 18;
int ethPriceUSD = getLatestPrice() * 10 ** 18;
int minRequiredEther = (minRequiredUSD * 10 ** 18) / ethPriceUSD;
return minRequiredEther;
}
//different attempt lowering division down to a seperate step and etc as to try not to return zero
function conversionOne() public view returns (int) {
int answer = getLatestPrice();
int ethPriceUSDAdj = answer * 10 ** 18;
int minRequiredUSD = usdPrice * 10 ** 18;
int minRequiredEther = minRequiredUSD * 10 ** 18;
int minRequiredEtherDivided = minRequiredEther / ethPriceUSDAdj;
return minRequiredEtherDivided;
}
//different attempt from one of the other recommended answers
function conversionTwo() public view returns (int) {
int _price = getLatestPrice() / 10 ** 8
int minRequiredEtherDivided = usdPrice / _price;
return minRequiredEtherDivided;
}
//function that uses the conversion function:
function makePayment(address _account, int256 _periods) public payable {
int conversionPrice = conversion();
int priceInEth = conversionPrice * _periods;
require(int(msg.value) >= priceInEth, "not enough ether submitted");
epochPaid[_account] = epoch + _periods;
}
My test running correctly to know I am returning the correct mock oracle price:
it("It should return the same value as the mock", async () => {
const { Subscription, mockV3Aggregator } = await loadFixture(
deployContractAndPrice
)
const priceConsumerResult = await Subscription.getLatestPrice()
const priceFeedResult = (await mockV3Aggregator.latestRoundData()).answer
assert.equal(priceConsumerResult.toString(), priceFeedResult.toString())
})
