Truffle 单元案例的 Truffle Chai 断言错误

Question

问题：在我的合约中尝试实施 ERC20 令牌时遇到以下 Truffle 测试用例的问题。

contract("Token Test", async(accounts) => {

const[deployerAccount, recipient, anotherAccount] = accounts;

it("All tokens should be in deployer's account", async() => {
    let instance = await Token.deployed();
    let totalSupply = await instance.totalSupply();
    // let balance = await instance.balanceOf(accounts[0]);
    // assert.equal(balance.valueOf(), totalSupply.valueOf(), "The Balance Was not same");

    expect(instance.balanceOf(deployerAccount)).to.eventually.be.a.bignumber.equal(totalSupply);
});

it("Is possible to send tokens between accounts", async() => {
    const sendToken = 1;
    let instance = await Token.deployed();
    let totalSupply = await instance.totalSupply();
    expect(instance.balanceOf(deployerAccount)).to.eventually.be.a.bignumber.equal(totalSupply);
    expect(instance.transfer(recipient, sendToken)).to.eventually.be.fulfilled;
    expect(instance.balanceOf(deployerAccount)).to.eventually.be.a.bignumber.equal(totalSupply.sub(new BN(sendToken)));
    expect(instance.balanceOf(recipient)).to.eventually.be.a.bignumber.equal(new BN(sendToken));
}); 

it("Should not be able to send more token than available with owner", async() => {
    let instance = await Token.deployed();
    let balanceOfDeployer = await instance.balanceOf(deployerAccount);
    console.log(balanceOfDeployer+ " : " + await instance.balanceOf(deployerAccount));
    // expect(instance.transfer(recipient, new BN(balanceOfDeployer+3))).to.eventually.be.rejected;

    expect(instance.balanceOf(deployerAccount)).to.eventually.be.a.bignumber.equal(balanceOfDeployer);
});

});

描述：当我尝试同时执行测试用例 2 和 3 时失败并出现以下错误：

"before all" hook: prepare suite for "Should not be able to send more token than available with owner":

  Uncaught AssertionError: expected '1000000000' to equal '999999999'
  + expected - actual

  -1000000000
  +999999999
  
  at /project_dir/node_modules/chai-as-promised/lib/chai-as-promised.js:302:22
  at processTicksAndRejections (internal/process/task_queues.js:95:5)



UnhandledRejections detected
Promise {
  <rejected> AssertionError: expected '1000000000' to equal '999999999'
      at /project_dir/node_modules/chai-as-promised/lib/chai-as-promised.js:302:22
      at processTicksAndRejections (internal/process/task_queues.js:95:5) {
    showDiff: true,
    actual: '1000000000',
    expected: '999999999',
    operator: 'strictEqual',
    uncaught: true
  }

然而，当我尝试独立执行两个测试用例时（评论测试用例 2 保留 3，反之亦然）。它们工作正常并且没有任何错误地完成。

需要帮助了解我在这里缺少什么以及如何修复它。

我尝试过的事情：最初，我认为这可能是由于测试用例 2 中变量的状态变化而发生的。所以我将测试用例 3 移动到一个新的 contract() 中。但我仍然面临同样的问题。然而，这不应该发生，因为 contract() 在执行每个合约测试之前提供了一个干净的房间环境。

P.S.: 我在 Contract 的构造函数中将 totalSupply 的值初始化为 1000000000。

Answer 1

在每个 expect() 我试图与合约通信的地方之前添加等待。这有助于解决问题。

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