Test coverage using jest-junit fails in a create-react-app project

Question

In a create-react-app/[email protected] project, I'm trying to generate a coverage report using jest-junit. Unfortunately, it fails with the following:

$ yarn run test --coverage
      Failed to write coverage reports:
      ERROR: Error: Invalid report format [jest-junit]
      STACK: Error: Invalid report format [jest-junit]
  at Object.module.exports.create (D:\Users\username\Documents\Project\node_modules\istanbul-api\lib\input-error.js:6:15)
  at Reporter.add (D:\Users\username\Documents\Project\node_modules\istanbul-api\lib\reporter.js:51:30)
  at D:\Users\username\Documents\Project\node_modules\istanbul-api\lib\reporter.js:62:18
  at Array.forEach (<anonymous>)
  at Reporter.addAll (D:\Users\username\Documents\Project\node_modules\istanbul-api\lib\reporter.js:61:14)
  at D:\Users\username\Documents\Project\node_modules\jest-cli\build\reporters\coverage_reporter.js:180:18
  at Generator.next (<anonymous>)
  at step (D:\Users\username\Documents\Project\node_modules\jest-cli\build\reporters\coverage_reporter.js:75:30)
  at D:\Users\username\Documents\Project\node_modules\jest-cli\build\reporters\coverage_reporter.js:86:15
  at process._tickCallback (internal/process/next_tick.js:68:7)

I encounter no errors if I run yarn run test. The following configuration block was added to the project's package.json file:

{
  ...
  "jest": {
    "collectCoverageFrom": [
      "src/**/*.{js,jsx,ts,tsx}",
      "!src/**/*.d.ts",
      "!src/**/__stories__/",
      "!<rootDir>/node_modules/"
    ],
    "coverageReporters": [
      "jest-junit"
    ]
  }
  ...
}

Has anyone successfully configured jest-junit in a create-react-app@2 project?

Your configuration doesn't seem to match what's shown on the jest-junit page, why have you diverged from that? — jonrsharpe
– jonrsharpe, Commented Nov 14, 2018 at 8:27

seniorquico · Accepted Answer · 2018-11-14 09:03:00Z

9

Thanks to @jonrsharpe for the quick comment. I wasn't paying close enough attention... my mistake was dropping jest-junit into coverageReporters (as opposed to reporters).

Unfortunately, create-react-app@2 does not appear to support a custom reporters configuration in package.json. Interestingly, the following command works:

$ yarn run test --coverage --reporters=default --reporters=jest-junit

I'm used to most of create-react-app's configs overriding any explicitly defined options. However, it appears an exception (or loophole?) exists for yarn run test. With the above, I get the desired junit.xml file.

answered Nov 14, 2018 at 9:03

seniorquico

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2 Comments

seniorquico Over a year ago

@twinlakes What do you mean by duplicate? In the end, I didn't add anything to package.json. I simply added the --reporters arguments to the test command.

Edgard Leal Over a year ago

It is because jest will produce two types of reports: default and jest-junit

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