jest-runner-mocha-next

It's a fork!

It is an experimental fork of jest-runner-mocha with some amazing features and fixes:

• Support for mocha custom version
• Support for setupFilesAfterEnv
• Support for custom clearMocks implementation (ex. for sinon)
• Support for jest flag coverageProvider v8 (node 10+ only)
• See more in changelog!

Usage

Install

Install jest(it needs Jest 21+) and jest-runner-mocha-next

npm install --save-dev jest jest-runner-mocha-next

Add it to your Jest config

In your package.json

{
  "jest": {
    "runner": "jest-runner-mocha-next"
  }
}

Or in jest.config.js

module.exports = {
  runner: 'jest-runner-mocha-next',
}

Run Jest

npx jest

Options

This project uses cosmiconfig, so you can provide config via:

• a jest-runner-mocha property in your package.json
• a jest-runner-mocha.config.js JS file
• a .jest-runner-mocharc JSON file

In package.json

{
  "jest-runner-mocha": {
    "cliOptions": {
      // Options here
    },
    "coverageOptions": {
      // Options here
    }
  }
}

or in jest-runner-mocha.config.js

module.exports = {
  cliOptions: {
    // Options here
  },
  "coverageOptions": {
    // Options here
  }
}

cliOptions

jest-runner-mocha maps some mocha CLI arguments to config options. For example --ui is cliOptions.ui

option	example
ui	"ui": "tdd"
timeout	"timeout": 10000
compiler	"compiler": "./path/to/babel-register"
file	"file": ["./path/to/include.js", "/supports/multiple/files.js"]

coverageOptions

jest-runner-mocha has some optional configuration for code coverage

option	example	description
useBabelRc	"useBabelRc": true	read .babelrc when instrumenting for code coverage (required if you transpile your code with babel).

Coverage

Coverage works outside of the box, simply npx jest -- --coverage

You can also use other Jest options like coveragePathIgnorePatterns and coverageReporters

Custom clearMocks function

Just make an export with a clearMocks function in your setupFilesAfterEnv, like this:

'use strict';

const sinon = require('sinon');
const nock = require('nock');

module.exports = {
	clearMocks: (suite) => {
		sinon.sandbox.restore();
		if(!nock.isDone()) {
			console.log(`Warning: pending mocks in ${suite.file}: ${nock.pendingMocks()}`);
			nock.cleanAll();
		}
	}
};