運行松露測試時的不確定性異常

Question

我一直在使用他們的測試服務（我相信使用Mocha和Chai）編寫自動化測試來測試我在Truffle中的眾籌功能。 我很難理解為什么測試會不確定性地失敗（即，它們似乎在隨機點失敗，但有隨機例外）。

例如，我運行測試，有時它們都通過了

我運行測試，有時會收到以下錯誤消息：

✓ 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)

這很容易混淆，因為斷言與錯誤消息不匹配-更改斷言失敗，但是，返回的消息是通過的較早測試的一部分（受益人單擊開始時設置了截止日期）。

再次運行測試，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)

現在，我有了上一條錯誤消息，現在又出現了另一條錯誤消息，該錯誤消息與斷言錯誤不匹配。

我第四次運行測試：

✓ 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)

與前兩個錯誤完全不同。 由於先前的測試（受益人應該能夠提取資金）也使狀態等於6的測試也通過了此測試，因此這又一次令人困惑。

每次測試前，我退出松露控制台，從項目中刪除我的構建文件夾，重新進入松露控制台並進行測試（這樣我就可以假定鏈已被重置），但是我仍然收到錯誤，首先我沒有通過Dapp對其進行測試時沒有得到這些結果，這是沒有道理的；其次，每次都不會顯示出來，這似乎是隨機的，帶有隨機的錯誤。

其他人對此有麻煩嗎？

Answer 1

• 這很容易混淆，因為斷言與錯誤消息不匹配-更改斷言失敗，但是，返回的消息是通過的較早測試的一部分（受益人單擊開始時設置了截止日期）。

這是javaScript異步測試的非常典型的結果，無論您是進行以太坊松露測試還是只是前端的純Karma-Jasmine測試。

我非常有信心在某些規范未正確設置的回調中包含斷言。 規范通過是由於缺少調用'done'回調參數的原因，或者是因為您沒有在it調用內正確返回Promise，因此測試只是作為誤報通過，忽略了回調內容。

一段時間后，回調中的代碼將運行並失敗，從而使正在運行的測試失敗，但會給出來自其測試的錯誤消息以及錯誤的否定值-因為您在錯誤的測試中遇到了異常，因此它失敗了。

這也可能由.catch語句大量記錄已done調用引起。

當然，也許我錯了，而您的問題與Truffle本身或testrpc 。

如果您是絕對確保所有it的規格得以妥善處理異步返回-或者一個承諾或打電話done - ，那么你應該粘貼測試代碼，等待更多的反饋：-S

另外，您在測試期間是否將testrpc用作區塊鏈？