wp-bootstrap/wp-bootstrap-loader

<?php
/**
 * PHPUnit bootstrap file
 *
 * @package Wp_Bootstrap_Loader
 */
 
$_tests_dir = getenv( 'WP_TESTS_DIR' );
if ( ! $_tests_dir ) {
    $_tests_dir = '/tmp/wordpress-tests-lib';
}
 
// Give access to tests_add_filter() function.
require_once $_tests_dir . '/includes/functions.php';
 
/**
 * Manually load the plugin being tested.
 */
function _manually_load_plugin() {
    require dirname( dirname( __FILE__ ) ) . '/wp-bootstrap-loader.php';
}
tests_add_filter( 'muplugins_loaded', '_manually_load_plugin' );
 
// Start up the WP testing environment.
require $_tests_dir . '/includes/bootstrap.php';