Question

我不知道为什么在终端中键入“ npm run test”时会出现此错误。看起来它是从lottery.test.js文件生成的。我仔细检查了语法，似乎我从编译文件中正确导出了模块。但是，我仍然在测试文件中出现错误。对于任何想知道的人，统一文件的名称都是Lottery.sol。

Lottery.test.js：

// Modules 
const assert = require('assert'); // used for ganache assertion
const ganache = require('ganache-cli'); // local ethereum testing netwrok 
const Web3 = require('web3'); // Web3 is a constructor function (that's why it is capatalized)

 // creating an instance of Web3
 const provider = ganache.provider();
 const web3 = new Web3(provider);
 
const { interface, bytecode } = require('../compile'); // descructors - going up the directory tree 



let lottery; 
let accounts; 

beforeEach( async () => {
    accounts = await web3.eth.getAccounts();

    lottery = await new web3.eth.Contract(JSON.parse(interface))
    .deploy({ data: bytecode })
    .send({ from: accounts[0], gas: '1000000' });

});

describe('Lottery Contract', () => {

    // General Test - Contact has been deployed
    it('deployes a contract', ()=> { 
        assert.ok(lottery.options.address);
    });

    // Test One - Allows one account to be enter
    it('allows one account to enter', async () => {
        await lottery.methods.enter().send({
            from: accounts[0],
            value: web3.utils.toWei('0.02', 'ether') // converts value from ether to wei since value is measured in wei
        });

        const players = await lottery.methods.getPlayers().call({from: accounts[0]});

        assert.equal(accounts[0], players[0]);
        assert.equal(1, players.length); 
    }); 

    // Test Two - Allows more than one account to be enter
    it('allows multiple accounts to enter', async () => {

        await lottery.methods.enter().send({
            from: accounts[0],
            value: web3.utils.toWei('0.02', 'ether') // converts value from ether to wei since value is measured in wei
        });

        await lottery.methods.enter().send({
            from: accounts[1],
            value: web3.utils.toWei('0.02', 'ether') // converts value from ether to wei since value is measured in wei
        });

        await lottery.methods.enter().send({
            from: accounts[2],
            value: web3.utils.toWei('0.02', 'ether') // converts value from ether to wei since value is measured in wei
        });

        const players = await lottery.methods.getPlayers().call({from: accounts[0]});

        assert.equal(accounts[0], players[0]);
        assert.equal(accounts[1], players[1]);
        assert.equal(accounts[2], players[2]);

        assert.equal(1, players.length); 
    }); 

    // Test Three - Only accounts that send more than 1 Ether can enter
    // Done by sending an entery fee LESS than what is expected and anticipating the error 
    // Using a Try-Catch structure 
    it('requires a minimum amount of ether to enter', async () => {

        try {  // trying to push an error to happen 
        await lottery.methods.enter().send({
            from: accounts[0],
            value: 0
        }); 
        assert(false); // pushing the function to generate an error
    }
        catch(err){ // triggered when an error is triggered
            
         assert(err);

        }
    });

    // Test Four - Only the manager can pick the winner 
    // By letting someone else BESIDE the manager choose the winner causing an error 
    it ('Only manager can call pickWinner', async () => {

        try {
            await lottery.methods.pickWinner().send({
                from: accounts[1] // someone else - not the manager
            });
            assert(false); 

        } catch(err){
            assert(err); 
        }

    });
 
    // Test Five - Resets the lottery when done 
    it('Sends money to the winner and resets the players array', async () => {
        // 1. Entering the lottery means the player sends an amount of Ether (2 Ether here)
        await lottery.methods.enter().send({
            from: accounts[0],
            value: web3.untils.toWei('2', 'ether')
        });

        // 2. Inital balance has to be less by 2 Ether
        const initialBalance = await web3.eth.getBalance(accounts[0]); // amount of Ether in units of wei in an account

        // 3. After picking the winner, the amountd are reset
        await lottery.methods.pickWinner().send({from: accounts[0]});

        // 4. Final balance should be more by 2 Ehter (normal before entering)
        const finalBalance = await web3.eth.getBalance(accounts[0]);

        // 5. Difference has to be less than 2 Ether - its not exactly 2 because we have to pay for gas 

        const difference = finalBalance - initialBalance; 

        assert(difference > web3.untils.toWei('1.8', 'ether'));

    });


});

compile.js：

// Modules 
const path = require ('path'); // module used to help build a path from compile.js to inbox.sol - guaranteed to get compatibility with OS used  
const fs = require ('fs');
const solc = require ('solc'); 

const lotteryPath = path.resolve(__dirname, 'contracts', 'Lottery.sol');
const source = fs.readFileSync(lotteryPath, 'utf8'); // to read the content of the inbox.sol file
module.exports = solc.compile(source, 1).contracts[':Lottery']; // compile statement

Answer 1

因为我无法评论 ngambinos 的帖子。这在 2021 年也对我有用。（感谢）ngambino0192：

问题可能在于 solc 编译器的版本控制。将版本的依赖项转换为更新的版本可能会解决您的问题。

尝试以下操作：

rm -rf node_modules // 删除 node_modules
rm -rf package-lock.json // 删除 package-lock.json
将 .sol 文件的导入语句更改为：pragma solidity ^0.4.25
将 .sol 文件的导入语句更改为：pragma solidity ^0.4.25
将 package.json 中的依赖更改为 "solc": "^0.4.25"
npm install // 安装新的依赖

然后你可以运行你的测试

终端错误：TypeError：无法解构'require（...）'的属性'interface'，因为它未定义

1 个答案: