goonframe/test.php

<?php
use PHPUnit\Framework\TestCase;

class IndexTest extends TestCase
{
    public function testHello(): void
    {
        $_GET['name'] = 'Poopiebutt';

        ob_start();
        include 'index.php';
        $content = ob_get_clean();

        $this->assertEquals('Hello Poopiebutt', $content);
    }

    public function testHelloNoParam(): void
    {
        unset($_GET['name']);
        ob_start();
        include 'index.php';
        $content = ob_get_clean();

        $this->assertEquals('Hello Dingo', $content);
    }
}