Make React PropType warnings throw errors in Jasmine/Jest

setupTestFramework.js

/* global jasmine */
/* eslint-disable no-console */
// this file is a modified version of https://gist.github.com/jsdf/6fc35890e4ed4a219072
import util from 'util'; // this is a node module

/**
 * This file is called by Jest when running tests
 * It elevates React PropType console warnings to exceptions.
 * This can be helpful because it will prevent tests from passing if PropTypes
 * for the component are not valid.
 * Additionally, this enables you to use Jest's expect().toThrowError() or expect().not.toThrowError()
 * against component invocations
 */

// keep a reference to the original console methods
const consoleWarn = console.warn;
const consoleError = console.error;

const elevateLogToError = (...args) => {
  throw new Error(util.format.apply(this, args).replace(/^Error: (?:Warning: )?/, ''));
};

jasmine.getEnv().beforeEach(() => {
  // make calls to console.warn and console.error throw an error
  console.warn = elevateLogToError;
  console.error = elevateLogToError;
});

jasmine.getEnv().afterEach(() => {
  // return console.warn and console.error to default behaviour
  console.warn = consoleWarn;
  console.error = consoleError;
});