测试智能契约时无效的柴属性

Question

在硬帽项目中，我使用工作服模拟ERC20合同，使用柴氏曾被称为断言：

    const {expect} = require("chai")
    const {artifacts, ethers} = require("hardhat")
    const {smock} = require("@defi-wonderland/smock")

    it("Should successfuly invoke transfer of given ERC20", async () => {
        //ARRANGE
        const MyContractFactory = await ethers.getContractFactory("MyContract")
        const myContract = await MyContractFactory.deploy()
        await myContract.deployed()

        const fakeERC20 = await smock.fake('IERC20');
        fakeERC20.transfer.returns(true)

        const erc20Contract = fakeERC20.address
        const amount = 5
        const to = '0xEA674fdDe714fd979de3EdF0F56AA9716B898ec8'

        //ACT
        const txReceipt = await myContract.myTransfer(erc20Contract, to, amount)

        //ASSERT
        expect(fakeERC20.transfer).to.have.been.calledOnce
        expect(fakeERC20.transfer).to.have.been.calledWith(to, amount);
    })

我收到一个错误：

Error: Invalid Chai property: calledOnce

我尝试过使用西农并解释了这里，但得到了另一个错误：

TypeError: { [Function]
  _watchable: 
   { callHistory: [ [Object] ],
     name: 'transfer',
     answerByIndex: {},
     answerByArgs: [],
     encoder: [Function],
     defaultAnswer: { value: true, shouldRevert: false } },
  atCall: [Function: bound atCall],
  getCall: [Function: bound getCall],
  returns: [Function: bound returns],
  returnsAtCall: [Function: bound returnsAtCall],
  reverts: [Function: bound reverts],
  revertsAtCall: [Function: bound revertsAtCall],
  whenCalledWith: [Function: bound whenCalledWith],
  reset: [Function: bound reset] } is not a spy or a call to a spy!

有什么想法吗？

Answer 1

通过增加

chai.use(smock.matchers)

所以基本上你应该：

• 遵循工作服的官方文档(一个很棒的库！)
• 如果您的测试在Invalid Chai property when calling calledOnce中失败，您应该安装sinon和sinon-chai。
• 最终，您的进口看起来或多或少类似于：const chai = require('chai') const sinon = require('sinon') const sinonChai = require('sinon-chai') const {ethers} = require('hardhat') const {smock} = require('@defi-wonderland/smock') const expect = chai.expect chai.use(smock.matchers)

Answer 2

从这里开始这里。

您可以通过在测试开始时添加以下内容来解决此问题。chai.config.proxyExcludedKeys.push('calledOnce');