运行松露测试时的不确定性异常

Question

我一直在使用他们的测试服务（我相信使用Mocha和Chai）编写自动化测试来测试我在Truffle中的众筹功能。 我很难理解为什么测试会不确定性地失败（即，它们似乎在随机点失败，但有随机例外）。

例如，我运行测试，有时它们都通过了

我运行测试，有时会收到以下错误消息：

✓ deadline is set when beneficiary clicks start
✓ should return a State of 'Funding' after start is clicked (101ms)
✓ should allow someone to invest and record balance
✓ should send 1 ERC20 token to participant (184ms)
✓ softcap should not return reached when amountRaised is smaller
✓ softcap should return reached when amountRaised is bigger
✓ hardcap should not return reached when amountRaised is smaller
✓ hardcap should return reached when amountRaised is bigger
1) should give 1 ETH in change as hard cap was exceeded
> No events were emitted
✓ should return a State of 'Successful' when hardcap reached
✓ beneficiary should be able to withdraw funds
✓ should return a State of 'Finished' when beneficiary has funds


22 passing (2s)
1 failing

1) Contract: Sale should give 1 ETH in change as hard cap was exceeded:
 Uncaught AssertionError: deadline was not set after start pressed by beneficiary: expected '0' to not equal 0
  at test/2Crowdsale_Test.js:119:14
  at <anonymous>
  at process._tickDomainCallback (internal/process/next_tick.js:228:7)



 1
 truffle(develop)> 
 /usr/local/lib/node_modules/truffle/build/cli.bundled.js:320098
    throw reason;
    ^

 TypeError: Cannot read property 'currentRetry' of undefined
at 

/usr/local/lib/node_modules/truffle/node_modules/mocha/lib/runner.js: 
552:28
at done 
(/usr/local/lib/node_modules/truffle/node_modules/mocha/lib/runnable.js 
:295:5)
at 
/usr/local/lib/node_modules/truffle/node_modules/mocha/lib/runnable.js: 
359:11
at <anonymous>
at process._tickDomainCallback (internal/process/next_tick.js:228:7)

这很容易混淆，因为断言与错误消息不匹配-更改断言失败，但是，返回的消息是通过的较早测试的一部分（受益人单击开始时设置了截止日期）。

再次运行测试，我得到：

✓ approves contract by beneficiary
✓ should return a State of 'Not Started' before start is clicked (134ms)
✓ deadline is set when beneficiary clicks start
✓ should return a State of 'Funding' after start is clicked (98ms)
✓ should allow someone to invest and record balance
✓ should send 1 ERC20 token to participant (143ms)
✓ softcap should not return reached when amountRaised is smaller
✓ softcap should return reached when amountRaised is bigger
✓ hardcap should not return reached when amountRaised is smaller
✓ hardcap should return reached when amountRaised is bigger
1) should give 1 ETH in change as hard cap was exceeded
> No events were emitted
2) should return a State of 'Successful' when hardcap reached

Events emitted during test:
---------------------------

Transfer(_from: <indexed>, _to: <indexed>, _value: 5)
FundTransfer(backer: 0xf17f52151ebef6c7334fad080c5704d77216b732, amount: 5000000000000000000, isContribution: true)
reachedSoftCap(recipient: 0x627306090abab3a6e1400e9345bc60c78a8bef57, totalAmountRaised: 6000000000000000000)

---------------------------
✓ beneficiary should be able to withdraw funds
✓ should return a State of 'Finished' when beneficiary has funds


21 passing (2s)
2 failing

1) Contract: Sale should give 1 ETH in change as hard cap was exceeded:
 Uncaught AssertionError: deadline was not set after start pressed by beneficiary: expected '0' to not equal 0
  at test/2Crowdsale_Test.js:119:14
  at <anonymous>
  at process._tickDomainCallback (internal/process/next_tick.js:228:7)

2) Contract: Sale should return a State of 'Successful' when hardcap reached:
 Uncaught AssertionError: hardcap was not met when amountRaised was bigger: expected false to equal true
  at test/2Crowdsale_Test.js:195:14
  at <anonymous>
  at process._tickDomainCallback (internal/process/next_tick.js:228:7)



  2
  truffle(develop)> 
  /usr/local/lib/node_modules/truffle/build/cli.bundled.js:320098
    throw reason;
    ^

  TypeError: Cannot set property 'state' of undefined
  at 
  /usr/local/lib/node_modules/truffle/node_modules/mocha/lib/runner.js: 
  576:20
  at done 
(/usr/local/lib/node_modules/truffle/node_modules/mocha/lib/runnable.js 
:295:5)
at /usr/local/lib/node_modules/truffle/node_modules/mocha/lib/runnable.js:353:11
at <anonymous>
at process._tickDomainCallback (internal/process/next_tick.js:228:7)

现在，我有了上一条错误消息，现在又出现了另一条错误消息，该错误消息与断言错误不匹配。

我第四次运行测试：

✓ should allow someone to invest and record balance
✓ should send 1 ERC20 token to participant (120ms)
✓ softcap should not return reached when amountRaised is smaller
✓ softcap should return reached when amountRaised is bigger
✓ hardcap should not return reached when amountRaised is smaller
✓ hardcap should return reached when amountRaised is bigger
✓ should give 1 ETH in change as hard cap was exceeded (275ms)
✓ should return a State of 'Successful' when hardcap reached (61ms)
✓ beneficiary should be able to withdraw funds
1) should return a State of 'Finished' when beneficiary has funds
> No events were emitted


 22 passing (2s)
 1 failing

 1) Contract: Sale should return a State of 'Finished' when beneficiary has funds:
 AssertionError: State of contract was not 'Finished': expected '4' to equal 6
  at test/2Crowdsale_Test.js:243:14
  at <anonymous>
  at process._tickDomainCallback (internal/process/next_tick.js:228:7)

与前两个错误完全不同。 由于先前的测试（受益人应该能够提取资金）也使状态等于6的测试也通过了此测试，因此这又一次令人困惑。

每次测试前，我退出松露控制台，从项目中删除我的构建文件夹，重新进入松露控制台并进行测试（这样我就可以假定链已被重置），但是我仍然收到错误，首先我没有通过Dapp对其进行测试时没有得到这些结果，这是没有道理的；其次，每次都不会显示出来，这似乎是随机的，带有随机的错误。

其他人对此有麻烦吗？

Answer 1

• 这很容易混淆，因为断言与错误消息不匹配-更改断言失败，但是，返回的消息是通过的较早测试的一部分（受益人单击开始时设置了截止日期）。

这是javaScript异步测试的非常典型的结果，无论您是进行以太坊松露测试还是只是前端的纯Karma-Jasmine测试。

我非常有信心在某些规范未正确设置的回调中包含断言。 规范通过是由于缺少调用'done'回调参数的原因，或者是因为您没有在it调用内正确返回Promise，因此测试只是作为误报通过，忽略了回调内容。

一段时间后，回调中的代码将运行并失败，从而使正在运行的测试失败，但会给出来自其测试的错误消息以及错误的否定值-因为您在错误的测试中遇到了异常，因此它失败了。

这也可能由.catch语句大量记录已done调用引起。

当然，也许我错了，而您的问题与Truffle本身或testrpc 。

如果您是绝对确保所有it的规格得以妥善处理异步返回-或者一个承诺或打电话done - ，那么你应该粘贴测试代码，等待更多的反馈：-S

另外，您在测试期间是否将testrpc用作区块链？