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我正在用 chai 和 hardhat 测试我的合同，我想在Transactions块测试中测试一个依赖于 if 语句的函数：bool(Date.now() < timestamp)。

我检查了：如何在 Mocha 测试中模拟时间的流逝，以便调用 setTimeout 回调？

我当然安装了 sinon：yarn add sinon

但我得到：

TypeError: Cannot read property 'useFakeTimers' of undefined

代码：

const { expect } = require("chai");
const { ethers } = require("hardhat");
const { sinon } = require("sinon");


describe("TokenContract", function () {

    var tubblySupply = 55_000_000;
    var unfreezeTime = Date.now() + 100;

    var seed_tokenPrice = 1000000000000000;
    var firstRoundTokensAllocation = 500000;
    var firstRoundTime = Date.now() + 20;

    let tubblySale;
    let tubblyToken;

    let owner;
    let addr1;
    let addr2;

  beforeEach(async function () {
      TubblyToken = await ethers.getContractFactory("TubblyToken");
      TubblySale = await ethers.getContractFactory("TubblySale");
      [owner, addr1, addr2] = await ethers.getSigners();

      tubblyToken = await TubblyToken.deploy(55_000_000, unfreezeTime);
      tubblySale = await TubblySale.deploy(tubblyToken.address, seed_tokenPrice, firstRoundTime, firstRoundTokensAllocation);
    });

  describe("Deployment", function () {
    it("Checks the totalSupply", async function() {
      expect(await tubblyToken.totalSupply()).to.equal(55_000_000);
    });

    it("Checks unfreeze time", async function() {
      expect(await tubblyToken.unfreezeTime()).to.equal(unfreezeTime);
    });

    it("Checks owner", async function() {
      expect(await tubblyToken.admin()).to.equal(owner.address);
    });

    it("Checks if saleAddress was assigned succesfuly", async function() {
      await tubblyToken.assignSaleAddress(tubblySale.address);
      expect(await tubblyToken.saleAddress()).to.equal(tubblySale.address);
    });
  });


  describe("Transactions", function() {
    it("Checks if transfer can occur before unfreeze but as owner", async function() {
      await tubblyToken.transfer(addr1.address, 20, { from: owner.address });
      expect(await tubblyToken.balanceOf(addr1.address)).to.equal(20);
    });

    it("Checks if transfer can occur from non-privileged account before unfreeze", async function() {
      try {
          await tubblyToken.connect(addr1).transfer(addr2.address, 20);
      } catch (err) {
      if (err.message === "VM Exception while processing transaction: reverted with reason string 'Fund are frozen.'") {
      }}
    });

    it("Checks if transfer can be done after unfreeze", async function() {
      var clock = sinon.useFakeTimers(now);
      clock.tick(unfreezeTime);
      await tubblyToken.connect(addr1).transfer(addr2.address, 20);
      expect(await tubblyToken.balanceOf(addr2.address)).to.equal(20);

    })

  });
});

describe("TubblySale", function() {
#TODO
})

感谢帮助！

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