mocha Illegal Token Error

[anderslyman]

I'm on Windows 8.
I have a spec folder containing a single test file, and when I run:

istanbul cover _mocha -- -R spec

Inside that folder, I get:

C:\Users\alyman\AppData\Roaming\npm\_mocha.CMD:1
(function (exports, require, module, __filename, __dirname) { @IF EXIST "%~dp0
                                                              ^
No coverage information was collected, exit without writing coverage information
SyntaxError: Unexpected token ILLEGAL
    at Module._compile (module.js:439:25)
    at Module._extensions..js (module.js:474:10)
    at Object.Module._extensions..js (C:\Users\alyman\AppData\Roaming\npm\node_modules\istanbul\lib\hook.js:101:13)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)
    at runFn (C:\Users\alyman\AppData\Roaming\npm\node_modules\istanbul\lib\command\common\run-with-cover.js:86:16)
    at C:\Users\alyman\AppData\Roaming\npm\node_modules\istanbul\lib\command\common\run-with-cover.js:189:17
    at C:\Users\alyman\AppData\Roaming\npm\node_modules\istanbul\lib\util\file-matcher.js:52:16
    at C:\Users\alyman\AppData\Roaming\npm\node_modules\istanbul\lib\util\file-matcher.js:35:9

[gotwarlost]

istanbul assumes that the _mocha you specify translates to a JS file which is true in non-windows environments. In a windows environment, this is likely a batch file that is getting loaded by node and, of course, fails.

Providing the relative path to the _mocha JS file should solve this problem. As in:

$ istanbul cover node_modules/mocha/bin/_mocha -- -R spec

[anderslyman]

Works great, thanks!

[BoyCook]

Hi, I'm also having a similar issue when using mocha. All my tests run fine and I get a spec report in the console, but I get this message at the end:

No coverage information was collected, exit without writing coverage information

I've tried several different combinations of running the tests (as mentioned above):

istanbul cover mocha -- -R spec
istanbul cover _mocha -- -R spec
istanbul cover node_modules/mocha/bin/mocha -- -R spec
istanbul cover node_modules/mocha/bin/_mocha -- -R spec

I've also tried with the mocha-lcov-reporter (-R mocha-lcov-reporter) and get the same result. Any help will be greatly appreciated. (I'm on OS X running node v0.10.15 if it helps).

[BoyCook]

I've got an update. I've realised the reason why it's not working is because the tests are not using require to include the libs being tested (I'm testing 'plain JavaScript' and don't want to do module.exports).

My tests are using vm.runInThisContext(fs.readFileSync('lib.js')); to load in the source being tested. I've tried with a different project using modules and require and it works fine.

[gotwarlost]

Try the --hook-run-in-context istanbul setting and see if that helps. So your command should be:

$ istanbul cover --hook-run-in-context _mocha -- -R spec

[EvanHongYousan]

it works ,thank you! @gotwarlost

[DevinXian]

Thank you, it works!@gotwarlost

[iongion]

Using windows 10
Using node v5.7.0
Using istanbul 0.4.3
Using mocha 2.4.5

No cygwin, no mingw, no linux emulation, plain old Windows with bat and cmd files
I've tried:

node_modules\.bin\istanbul cover --hook-run-in-context _mocha --compilers js:babel-core/register --bail --sort --reporter dot --require .\test\bootstrap.js --recursive test/unit/**/**/*.spec.js

I get:

No coverage information was collected, exit without writing coverage information
C:\Users\me\AppData\Roaming\npm\_mocha.CMD:1
(function (exports, require, module, __filename, __dirname) { @IF EXIST "%~dp0\node.exe" (
                                                              ^
SyntaxError: Unexpected token ILLEGAL
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:387:25)
    at Object.Module._extensions..js (module.js:422:10)
    at Object.Module._extensions.(anonymous function) [as .js]

[iongion]

In the end it is working, like this:
(this not bash, it is windows batch)

node_modules\.bin\babel-node.cmd ./node_modules/istanbul/lib/cli cover node_modules/mocha/bin/_mocha -- --compilers js:babel-core/register --bail --sort --reporter dot --require test/bootstrap.js --recursive test/unit/**/**/*.spec.js

[legendtang]

Still encounter this issue.

Using Windows 10
Using node v6.1.0
Using istanbul 0.4.3
Using mocha 2.5.3

[xunshicheng]

i do like below, it works:
npm install mocha， not add -g;
then $ istanbul cover node_modules/mocha/bin/_mocha

[bennycode]

I am on Windows 10 and installed "istanbul" globally (v0.4.5). My "npm test" script looks like this:

"test": "istanbul cover node_modules/mocha/bin/_mocha -s 30000 -t 30000 --recursive test/harness.js test --trace-warnings"

When I am running npm test I am getting this exception:

> istanbul cover node_modules/mocha/bin/_mocha -s 30000 -t 30000 --recursive test/harness.js test --trace-warnings

No coverage information was collected, exit without writing coverage information
D:\dev\projects\wireapp\proteus.js\node_modules\mocha\lib\utils.js:634
        throw new Error("cannot resolve path (or pattern) '" + path + "'");
        ^

Error: cannot resolve path (or pattern) '30000'
    at Object.lookupFiles (D:\dev\projects\wireapp\proteus.js\node_modules\mocha\lib\utils.js:634:15)

Can you help me with this?

[bennycode]

Note: I also got a similar issue when running istanbul together with jasmine:

istanbul cover --report html jasmine
No coverage information was collected, exit without writing coverage information
D:\dev\projects\wireapp\wire-web-packages\packages\cryptobox\node_modules.bin\jasmine.CMD:1
(function (exports, require, module, __filename, __dirname) { @if EXIST "%~dp0\node.exe" (

What I needed to do is change:

istanbul cover --report html jasmine

To:

istanbul cover --report html ./node_modules/jasmine/bin/jasmine.js