I get TypeError: cannot read property 'send' of null for mocha test I'm writing for solidity

Question

我正在为智能合约编写测试，但运行出错了。

这是代码

 beforeEach ( async () => {
    // Get a list of all accounts
    accounts = await web3.eth.getAccounts();

    // use one of those accounts to deploy the contract
    inbox = await new web3.eth.Contract(JSON.parse(interface))
        .deploy({ data: bytecode, arguments: ['Hello'] })
        .send({from: accounts[0], gas: '1000000'});    
 });

 describe("Inbox", () => {
    it('deploys a contract',() => {
        console.log(inbox);
    })
 })

和错误

  Inbox
    1) "before each" hook for "deploys a contract"

  1) "before each" hook for "deploys a contract":
     TypeError: Cannot read property 'send' of null
      at Context.beforeEach (test/Inbox.test.js:63:9)
      at process._tickCallback (internal/process/next_tick.js:68:7)

我做错了什么？

Answer 1

问题是我将合约的初始构造函数设置为私有；这意味着它没有被初始化，所以我没有部署字节码，因此为 null。

I get TypeError: cannot read property 'send' of null for mocha test I'm writing for solidity

I get TypeError: cannot read property 'send' of null for mocha test I'm writing for solidity

mocha.js

node.js

ethereum

solidity