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				'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 or explicitly running all tests
				if (
				!process.env.CI &&
				argv.indexOf('--watchAll') === -1 &&
				argv.indexOf('--watchAll=false') === -1
				) {
				// https://github.com/facebook/create-react-app/issues/5210
				const hasSourceControl = isInGitRepository() \|\| isInMercurialRepository();
				argv.push(hasSourceControl ? '--watch' : '--watchAll');
				}

				jest.run(argv);