Istanbul provides me with a thorough analysis, yet it always seems to conclude with an error

Currently, I am experimenting with a basic application (found in the Mocha tutorial code available at ) to troubleshoot why Istanbul is giving me trouble. The issue is that Istanbul successfully generates a coverage summary but then throws an error for unknown reasons. Despite all my tests passing without any issues, I am puzzled as to why this error is occurring. Below is the command I use to run Istanbul:

$ 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

It's puzzling why describe is not being recognized since all the tests are functioning correctly and passing.

javascriptmocha.jschaiistanbul

Answer №1

I have identified the issue: mocha was not installed globally, so I needed to specify its reference:

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

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