Jest --coverage : help

[seeliang]

Hi everyone,

is anyway i can setup this with Jest?

many thanks

[jseminck]

Just add: && cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js

    "test": "node --harmony_proxies node_modules/.bin/jest --coverage && cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js",

[tizmagik]

Thanks @jseminck would be good to add this to the README, I think?

[ndelvalle]

I followed @jseminck approach, but now Im getting the following error:

[error] "2016-11-04T14:51:39.503Z"  'error from lcovParse: ' 'Failed to parse string'
[error] "2016-11-04T14:51:39.505Z"  'input: ' ''
[error] "2016-11-04T14:51:39.506Z"  'error from convertLcovToCoveralls'

Any ideas? Thanks in advanced.

[cdaringe]

@ndelvalle, most likely, your coverage/lcov.info is empty

[ndelvalle]

yep @cdaringe that was the problem 👍

[joseluisq]

👍

[bcoe]

@jseminck @seeliang worth noting that Jest's coverage implementation outputs a .JSON report that is compatible with nyc and Istanbul in the coverage/ folder. So this would totally work:

nyc report --temp-directory=coverage --reporter=text-lcov | coveralls

[seeliang]

Thanks, guys.
I will give a go later :)

[iddan]

Can this be added to the README?

[nickmccurdy]

👍 For adding to readme.

Is there any advantage to any specific coverage format? Which file in coverage should we pipe into coveralls if we add it to the readme?

  -rw-r--r--   1 nick  staff  10945 Sep  7 15:15 clover.xml
  -rw-r--r--   1 nick  staff  28542 Sep  7 15:15 coverage-final.json
  -rw-r--r--   1 nick  staff  23445 Sep  6 21:46 coverage.json
  -rw-r--r--   1 nick  staff  25730 Sep  6 03:59 coverage.raw.json
  drwxr-xr-x   9 nick  staff    306 Sep  7 13:36 lcov-report
  -rw-r--r--   1 nick  staff   4024 Sep  7 15:15 lcov.info

[arkgast]

Why not use a script like this?

jest --coverage && cat ./coverage/lcov.info | coveralls

[nickmccurdy]

Personally I like to set "jest": { "collectCoverage": true } in package.json to enable coverage reporting everywhere, add coveralls as a devDependency, and have CI run coveralls < coverage/lcov.info.

[arkgast]

😮 now I got it, so most people don't have coveralls as a devDependency that's way ./node_modules/coveralls/bin/coveralls.js appears in their configurations.

I was asking about that part specially.

By the way I think this is the best approach to maintain configurations clearer. As a side effect you had clarify my doubt 😆, thanks man

[nickmccurdy]

I don't think that's the case. Assuming that the other technique is to npm install coveralls in CI after a build, it would still install the package to node_modules with a binary in that location. Whether or not you install as a saved devDependency, it will only be executable directly via coveralls if you have it in your $PATH (some CI services like Travis do this automatically) or if you're calling it in an npm script (which does something similar).

[dennisja]

@nickmccurdy Your solution isnot supported by create-react-app
It gives the warning below:
Out of the box, Create React App only supports overriding these Jest options:
• collectCoverageFrom
• coverageReporters
• coverageThreshold
• snapshotSerializers.
These options in your package.json Jest configuration are not currently supported by Create React App:
• collectCoverage

[nickmccurdy]

Yes, but you can still use jest --coverage in your build script even though the config option isn't supported.

[dennisja]

Yeah,
I solved it by run yarn test --coverage which later runs jest --coverage

[ummahusla]

This is how I got it to work

node_modules/.bin/jest --coverage && cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js

[jeff1evesque]

@jseminck, @tizmagik: sorry to bother in this thread. I'm using jest + enzyme, and hoping to pipe the coverage results to coveralls. So, I implemented test:coveralls, a script from my package.json:

  "scripts": {
    "build:browserify": "browserify -t [ babelify --presets env,stage-2,react ] content.jsx > ../../interface/static/js/content.js",
    "prebuild:dos2unix": "find . -type f -print0 | xargs -0 dos2unix",
    "watch:jsx": "onchange 'src/jsx/**/*.jsx' 'src/jsx/**/*.js' -- npm run build:browserify",
    "test": "NODE_ENV=test jest --config jest.config.js",
    "test:coveralls": "npm run test --coverage --coverageReporters=lcov.info | ./node_modules/coveralls/bin/coveralls.js"
  },

I've verified both coveralls.js, and lcov.info are nonempty. However, my travis build, seems to error:

[error] "2018-05-31T16:37:12.946Z"  'error from convertLcovToCoveralls'
/home/travis/build/jeff1evesque/machine-learning/src/jsx/node_modules/coveralls/bin/coveralls.js:18
        throw err;
        ^
Failed to parse string
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! reactjs@1.0.0 test:coveralls: `npm run test --coverage --coverageReporters=lcov.info | ./node_modules/coveralls/bin/coveralls.js`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the reactjs@1.0.0 test:coveralls script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR!     /home/travis/.npm/_logs/2018-05-31T16_37_12_965Z-debug.log
The command "npm run test:coveralls" exited with 1.

[jeff1evesque]

@jseminck, @tizmagik: nevermind, I think I've fixed it. The corresponding travis build, seems to have run the following without erroring:

cat lcov.info | ./node_modules/coveralls/bin/coveralls.js

I guess I'll merge my corresponding pull request, and see if my webhook updates coveralls.

[jeff1evesque]

Ah, didn't have to wait for PR to be merged. Seems like the configurations worked. Thank you everyone, pretty much recycled different aspects from various comments in this issue.

[petermikitsh]

@nickmccurdy's solution worked for me. Thanks Nick!

[ambroiseRabier]

Based on @jeff1evesque and @nickmccurdy answer:

package.json

"scripts": {
  "ci-process-cover": "cat coverage/lcov.info | coveralls"
}

jest.config.js

module.exports = {
  "collectCoverage": true
  // ...
}

.travis.yml

script:
  - npm run test
after_script:
  - npm run ci-process-cover

Or have tests run twice:

package.json

`cover`: `jest --coverage --coverageReporters=text-lcov | coveralls`

.travis.yml

script:
  - npm run test
after_script:
  - npm run cover

If you replace npm run test by npm run cover, coverage will work, but your CI will not fail if one test fail.

[zdrawku]

I've faced a similar problem, hope this post might help you a little bit.

[adefemi171]

Hi all am facing

[error] "2021-01-11T05:26:15.227Z"  'error from lcovParse: ' 'Failed to parse string'
[error] "2021-01-11T05:26:15.230Z"  'input: ' ''
[error] "2021-01-11T05:26:15.230Z"  'error from convertLcovToCoveralls'

when running it locally and in my Github action. How do I generate .lcov so the file won't be empty? @nickmccurdy @jseminck @tizmagik

[zdrawku]

@adefemi171 if you are using Angular --code-coverage will generate a coverage report for you.

[adefemi171]

Am using Node and Jest and I ran jest --coverage which created a coverage folder but with an empty lcov.info @zdrawku

[Yegorich555]

Why not use a script like this?

jest --coverage && cat ./coverage/lcov.info | coveralls

Because it doesn't work on Windows.

Do we have any cross-platform solution ?

I figured only following:

jest --coverage && coveralls < coverage\\lcov.info

Ordinary pipe jest --coverage --coverageReporters=text-lcov | coveralls somehow doesn't work with NodeJS 14.15.*