Wordpress plug-in test pattern

wp-test.php

<?php

function wpcw_gg_RunTests() {
    global $wpdb;
    
    echo "<h3>Running Tests...</h3>";
    
    $course_id = wpcw_gg_getFirstCourseId();
    gg_OK($course_id, "First Course Id: {$course_id}");
    
    $unit_url = wpcw_gg_getFirstUnitLink($course_id);
    gg_OK($unit_url!="", "Unit url is {$unit_url}");
}

function wpcw_gg_getFirstCourseId() {
    global $wpdb;
    $tbl = $wpdb->prefix . 'wpcw_courses';
    return $wpdb->get_var("SELECT course_id FROM $tbl ORDER BY course_id ASC LIMIT 0,1");
}

function gg_OK($result, $msg) {
    if($result) {
        echo "<br>{$msg}<br>";
    } else {
        echo "Test Failed -> {$msg}";
    }
}

function gg_NO($result, $msg) {
    if( !$result ) {
        echo "<br>{$msg}<br>";
    } else {
        echo "<br>Test Failed -> {$msg}<br>";
    }
}

////
add_action("admin_menu", "wpcw_groups_grading_menu");
function wpcw_groups_grading_menu() {
    add_menu_page('Groups Grading', 'Groups Grading', 'publish_posts', 'wpcw-groups-grading-2', 'wpcw_groups_grading_manage', WP_PLUGIN_URL . '/wpcw-groups-grading-2/icon.png');
    add_submenu_page('wpcw-groups-grading-2', "Plugin Tests", "Plugin Tests", "manage_options", "wpcw_gg_RunTests", "wpcw_gg_RunTests");
}

// Hide Plugin tests item from menu
add_action( 'admin_head', 'wpcw_gg_AdjustMenu', 999 );
function wpcw_gg_AdjustMenu() {
    $status = remove_submenu_page('wpcw-groups-grading-2', 'wpcw_gg_RunTests');
}