Example of getting Mocha going with React Native

.babelrc

{
  "presets": ["react-native"]
}

package.json

{
  "name": "MochaTestableApp",
  ...
  "scripts": {
    ...
    "test": "mocha --require test/testhook --compilers js:babel-register --recursive",
  },
  ...
}

testhook.js

// The purpose of this file is to ensure
// the babel transpiler is activated prior to any
// test code, and using the same babel options

/* eslint semi: [2, "always"] */


const fs = require('fs');
const path = require('path');
const config = getBabelRC();

function getBabelRC() {
	const rcpath = path.join(__dirname, '..', '.babelrc');
	const source = fs.readFileSync(rcpath).toString();
	return JSON.parse(source);
}

config.ignore = (filename) => {
	if (!(/\/node_modules\//).test(filename)) {
		return false; // if not in node_modules, we want to compile it
	} else if ((/\/node_modules\/react-native\//).test(filename)) {
		// its RN source code, so we want to compile it
		return false;
	}
	// else it's in node modules and NOT RN source code
	return true;
};

require('babel-register')(config);

global.__DEV__ = true;

// Now get some global things available
const chai = require('chai');
const sinon = require('sinon');
const dirtyChai = require('dirty-chai');
const chaiImmutable = require('chai-immutable');
const expect = chai.expect;
const should = chai.should();

chai.use(dirtyChai);
// chai.use(chaiImmutable);

global.chai = chai;
global.expect = expect;
global.should = should;
global.sinon = sinon;