javascript - Istanbul 尔给了我报道但以错误结束输出

Question

我正在测试一个简单的应用程序(来自此处的 Mocha 教程代码 https://marcofranssen.nl/using-mocha-chai-sinon-to-test-node-js/ )以尝试让 Istanbul 正常工作。我的问题是 Istanbul 可以很好地为我提供覆盖范围摘要，但随后由于某种原因吐出一个错误，我不确定为什么。我的测试都通过了，所以希望它们不是问题所在。以下是我管理 Istanbul 尔的方式:

$ istanbul cover test.js

=============================================================================
Writing coverage object [C:\Users\path\test\coverage\coverage.json]
Writing coverage reports at [C:\Users\path\test\coverage]
=============================================================================

=============================== Coverage summary ===============================

Statements   : 54.55% ( 6/11 )
Branches     : 100% ( 0/0 )
Functions    : 0% ( 0/2 )
Lines        : 54.55% ( 6/11 )
================================================================================
ReferenceError: describe is not defined
    at Object.<anonymous> (C:\Users\path\test.js:9:386)
    at Module._compile (module.js:435:26)
    at Object.Module._extensions.(anonymous function) [as .js] (C:\Users\path
\AppData\Roaming\npm\node_modules\istanbul\lib\hook.js:107:24)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:311:12)
    at Function.Module.runMain (module.js:467:10)
    at runFn (C:\Users\path\AppData\Roaming\npm\node_modules\istanbul\lib\com
mand\common\run-with-cover.js:122:16)
    at C:\Users\path\AppData\Roaming\npm\node_modules\istanbul\lib\command\co
mmon\run-with-cover.js:251:17
    at C:\Users\path\AppData\Roaming\npm\node_modules\istanbul\lib\util\file-
matcher.js:68:16
    at C:\Users\path\AppData\Roaming\npm\node_modules\istanbul\node_modules\a
sync\lib\async.js:52:16

我不太确定为什么 describe 没有被识别，因为所有测试都运行良好并通过。

Answer 1

发现问题:mocha 没有全局安装所以我不得不引用它:

istanbul cover /path/to/bin/_mocha path/to/test.js