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process.exit before console buffer flushed in Windows

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評估

難度
3/5
預估耗時
1-2 天
新手友好度
38/100
Issue 類型
缺陷
描述清晰度
基本清楚
活躍度
停滯
技術堆疊
javascript

研究方向

從 bin/nodeunit 的第 128-132 行附近開始,尤其是第 130 行的 process.exit(1),並在 Cygwin 下使用提供的 tests.js 重現此問題。確認失敗的執行會顯示所有主控台輸出,同時仍回傳結束代碼 1;現有的 workaround 提供了要驗證的預期行為。

由索引模型根據 Issue 內容生成。

描述

Symptoms

If any test fails, not all the console output is shown (console output is truncated).

Problem does not show up in standard Windows cmd, but does show up if tests are run from Cygwin or within Sublime Text build system. In Cygwin, if the output is piped to a file instead of being displayed on the console then all the results show in the file, even though they did not show in the console when not piped.

Environment

  • nodeunit 0.9.0,
  • node 0.10.17
  • Windows 7

Minimal Example

I have the following test file, tests.js:

for (var i = 0; i < 30; i++)
    console.log('' + i);

exports.dummy = function(test) {
    test.fail();
    test.done();
}

Running from Cygwin, the result is:

$ nodeunit tests.js
0

(I.e., only the first console.log appears). But if I remove the test.fail line then all the output appears.

Cause

My guess of the cause is given in the title. It appears that under different circumstances, sometimes the node console is asynchronous (perhaps due to the way Windows pipes work, I'm not sure), and doesn't flush the output after every write. When a test fails, line 130 in nodeunit/nodeunit process.exit(1); seems to recognize the error and exit the process, but process.exit does not seem to always wait for the console output to be received by the terminal. To confirm this hypothesis, if I remove the process.exit line, then the output is displayed correctly.

Solution

A work-around seems to be to change lines 128-132 to the following:

testrunner.run(files, options, function(err) {
    if (err) {
        process.on('exit', function() {
            process.exit(1);
        });
    }
});

This seems to produce the correct error code for the process and also show all the output. I don't know if there are any other side effects of not ending the process immediately in the callback function.

主要語言
JavaScript
星號
1.9k
分支
359
PR 合併指標
30 天內沒有已合併 PR

環境準備

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從這裡開始

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  2. 在 Issue 下留言說明你要接手 —— 這能避免兩個人做同樣的事。
  3. Fork 儲存庫,在一個分支上完成修改。
  4. 送出 Pull Request,並在描述裡引用這個 Issue 編號。

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