测试Ebay拍卖智能合约时遇No Contract deployed报错求助

错误现象 #

开发产品拍卖用的Ebay智能合约，部署操作成功，但执行Hardhat测试时反复出现错误：Error: No Contract deployed with name Ebay，尝试在test.js中用ABI替代deployer后问题依旧。

测试执行日志 #

yarn run v1.22.15
warning package.json: No license field
$ "E:\Block Chain Projects\30_SMARTCONTRACTS.sol\A Way To Testing\node_modules\.bin\hardhat" test


  Ebay Smart Contract
    Upload Product function
This is deployer0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266
      1) "before each" hook for "if the base Price is less than 0 or invalid should revert"


  0 passing (2s)
  1 failing

  1) Ebay Smart Contract
       "before each" hook for "if the base Price is less than 0 or invalid should revert":
     Error: No Contract deployed with name Ebay
      at Object.getContract (node_modules\@nomiclabs\hardhat-ethers\src\internal\helpers.ts:447:11)
      at processTicksAndRejections (node:internal/process/task_queues:96:5)
      at Context.<anonymous> (test\Test.js:18:12)



error Command failed with exit code 1.

相关代码 #

Test.js #

//it
//describe
//beforeEach

const { expect, assert } = require("chai");
const { ethers, getNamedAccounts } = require("hardhat");
describe("Ebay Smart Contract", async function() {
  let Ebay;
  let deployer;
  const product = {
    name: "CYCLE",
    description: "gare cycles",
    BasePrice: "5",
  };
  beforeEach(async () => {
    deployer = (await getNamedAccounts()).deployer;
    console.log("This is deployer" + deployer);
    Ebay = await ethers.getContract("Ebay", deployer);
  });

  describe("Upload Product function", async function() {
    it("if the base Price is less than 0 or invalid should revert", async function() {
      expect(
        Ebay.UploadProduct(product.name, product.description, product.BasePrice)
      ).to.be.revertedWith(Base_Price_cannot_be_Zero());
    });
  });
});

deploy.js #

const { ethers, deployments } = require("hardhat");
require("dotenv").config();
async function main() {
  // const { deploy, log } = deployments;
  //const { deployer } = await getNamedAccounts();

  const Auction = await ethers.getContractFactory("Ebay");
  const auction = await Auction.deploy();
  await auction.deployed();
  console.log(auction.address);

  // const Auction = await deploy("Auctionbargain", {
  //   from: deployer,
  //   args: [],
  //   log: true,
  //   waitconfirmations: network.config.blockConfirmations || 1,
  // });
  //console.log(Auction.address);
  //log("------------------------------------");
}

main()
  .then(() => process.exit(0))
  .catch((error) => {
    console.log(error);
    process.exit(1);
  });

hardhat.config.js #

require("@nomicfoundation/hardhat-toolbox");
require("hardhat-deploy");
require("dotenv").config();

/** @type import('hardhat/config').HardhatUserConfig */
module.exports = {
  solidity: {
    compilers: [{ version: "0.6.6" }, { version: "0.8.8" }],
  },
  networks: {
    hardhat: {
      chainId: 31337,
    },
    // goerli: {
    // url: GOERLI_RPC_URL,
    // accounts: [PRIVATE_KEY],
    // chainId: 5,
    // blockConfirmations: 6,
    // },
  },
  namedAccounts: {
    deployer: {
      default: 0, // here this will by default take the first account as deployer
    },
  },
};

问题原因及解决方案 #

核心原因 #

测试代码中使用ethers.getContract("Ebay")获取合约实例，这个方法依赖hardhat-deploy插件的部署记录。但当前deploy.js是直接用ethers.getContractFactory部署合约，不会将合约信息注册到hardhat-deploy的系统中，导致测试时找不到对应的合约记录。

解决方案一：改用hardhat-deploy的deploy函数部署（推荐） #

修改deploy.js，启用注释的hardhat-deploy部署逻辑，确保合约名和测试中使用的"Ebay"一致：

const { deployments, getNamedAccounts } = require("hardhat");
const { deploy, log } = deployments;
require("dotenv").config();

async function main() {
  const { deployer } = await getNamedAccounts();

  const Auction = await deploy("Ebay", { // 合约名改为"Ebay"，匹配测试中的调用
    from: deployer,
    args: [],
    log: true,
    waitConfirmations: network.config.blockConfirmations || 1, // 修正拼写：waitConfirmations
  });
  console.log(Auction.address);
  log("------------------------------------");
}

main()
  .then(() => process.exit(0))
  .catch((error) => {
    console.log(error);
    process.exit(1);
  });

之后测试前先执行部署命令：npx hardhat deploy，再运行测试即可正常获取合约实例。

解决方案二：测试时手动部署合约 #

如果不想依赖hardhat-deploy，修改Test.js的beforeEach逻辑，直接在测试环境中部署合约：

const { expect, assert } = require("chai");
const { ethers, getNamedAccounts } = require("hardhat");
describe("Ebay Smart Contract", async function() {
  let Ebay;
  let deployer;
  const product = {
    name: "CYCLE",
    description: "gare cycles",
    BasePrice: "-1", // 修改为负数触发回滚
  };
  beforeEach(async () => {
    deployer = (await getNamedAccounts()).deployer;
    console.log("This is deployer" + deployer);
    // 手动部署合约
    const ebayFactory = await ethers.getContractFactory("Ebay");
    Ebay = await ebayFactory.deploy();
    await Ebay.deployed();
  });

  describe("Upload Product function", async function() {
    it("if the base Price is less than 0 or invalid should revert", async function() {
      // 修正：revertedWith参数为字符串，且需await异步操作
      await expect(
        Ebay.UploadProduct(product.name, product.description, product.BasePrice)
      ).to.be.revertedWith("Base_Price_cannot_be_Zero");
    });
  });
});

额外修正点 #

测试代码中的revertedWith存在两个问题：

1. 参数应该是字符串，不是函数调用Base_Price_cannot_be_Zero()，需改为"Base_Price_cannot_be_Zero"（需和合约中定义的错误信息完全一致）。
2. 原测试传入的BasePrice是"5"，不会触发回滚，应改为负数如"-1"才能触发预期的回滚逻辑；同时要对合约方法调用添加await，因为合约操作是异步的。

内容的提问来源于stack exchange，提问作者Abhishek Yadav