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tests...FundMe.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;
import {AggregatorV3Interface} from "@chainlink/contracts/src/v0.8/shared/interfaces/AggregatorV3Interface.sol";

contract FundMe{
    // 1、创建一个收款函数
    // 2、记录投资人并且查看
    // 3、在锁定期内，没有达到目标值，投资人在锁定期以后退款

    mapping(address=>uint256) public fundersToAmount;
    uint256 MINIMUM_VALUE = 100 * 10 ** 18; //USD
    AggregatorV3Interface internal dataFeed;
    constructor(){
        dataFeed = AggregatorV3Interface(0x694AA1769357215DE4FAC081bf1f309aDC325306);
    }

    function fund() external payable {
        require(convertEthToUsd(msg.value) >= MINIMUM_VALUE,"Send more ETH");
        fundersToAmount[msg.sender] = msg.value;
    }

    /**
     * Returns the latest answer.
     */
    function getChainlinkDataFeedLatestAnswer() public view returns (int) {
        // prettier-ignore
        (
            /* uint80 roundID */,
            int answer,
            /*uint startedAt*/,
            /*uint timeStamp*/,
            /*uint80 answeredInRound*/
        ) = dataFeed.latestRoundData();
        return answer;
    }

    function convertEthToUsd(uint256 ethAmount) internal  view returns(uint256){
        uint256 price = uint256(getChainlinkDataFeedLatestAnswer());
        return ethAmount * price /(10 **8);
    }
}