I have setup jest and jest-junit as the reporter and followed the simple instructions given by jest-junit.

This includes npm install jest --save-dev and npm install jest-junit --save-dev

My package.json looks like this (excerpt):

  devDependencies: { 

    jest: ^22.4.4,

    jest-junit: ^4.0.0,

  },

  scripts: {

    test: jest --ci --testResultsProcessor='jest-junit'

  },

  jest: {

    verbose: true,

    testResultsProcessor: jest-junit

  },

  jest-junit: {

    suiteName: Test Suite,

    output: ./junit.xml

  }

When running npm run test on my machine (OSX), it works well. When running it as part of the CI build process or on another Windows machine, I am getting the following error:

Module 'jest-junit' in the testResultsProcessor option was not found.