text: 'use strict'
  
  // Do this as the first thing so that any code reading it knows the right env.
  process.env.BABEL_ENV = 'test'
  process.env.NODE_ENV = 'test'
  process.env.PUBLIC_URL = ''
  
  // Makes the script crash on unhandled rejections instead of silently
  // ignoring them. In the future, promise rejections that are not handled will
  // terminate the Node.js process with a non-zero exit code.
  process.on('unhandledRejection', err => {
  	throw err
  })
  
  // Ensure environment variables are read.
  require('../config/env')
  
  
  const jest = require('jest')
  const execSync = require('child_process').execSync
  let argv = process.argv.slice(2)
  
  function isInGitRepository() {
  	try {
  		execSync('git rev-parse --is-inside-work-tree', { stdio: 'ignore' })
  		return true
  	} catch (e) {
  		return false
  	}
  }
  
  function isInMercurialRepository() {
  	try {
  		execSync('hg --cwd . root', { stdio: 'ignore' })
  		return true
  	} catch (e) {
  		return false
  	}
  }
  
  // Watch unless on CI, in coverage mode, explicitly adding `--no-watch`,
  // or explicitly running all tests
  if (
  	!process.env.CI &&
  	argv.indexOf('--coverage') === -1 &&
  	argv.indexOf('--no-watch') === -1 &&
  	argv.indexOf('--watchAll') === -1
  ) {
  	// https://github.com/facebook/create-react-app/issues/5210
  	const hasSourceControl = isInGitRepository() || isInMercurialRepository()
  	argv.push(hasSourceControl ? '--watch' : '--watchAll')
  }
  
  // Jest doesn't have this option so we'll remove it
  if (argv.indexOf('--no-watch') !== -1) {
  	argv = argv.filter(arg => arg !== '--no-watch')
  }
  
  console.log(`[scripts | test] About to run jest tests...`, JSON.stringify(argv, null, 4))
  
  jest.run(argv)
  