Tests an Abstract Class

AbstractTest.php

<?php

namespace Tests;

use PHPUnit\Framework\TestCase;
use MyVendor\MyPackage\AbstractClass;

class AbstractTest extends TestCase
{
    protected $newAnonymousClassFromAbstract;
    
    protected function setUp()
    {
        // Create a new instance from the Abstract Class
        $this->newAnonymousClassFromAbstract = new class extends AbstractClass {
            // Just a sample public function that returns this anonymous instance
            public function returnThis()
            {
                return $this;
            }
        };
    }
    
    public function testAbstractClassMethod()
    {
        // Let's test the public function we created in the anonymous class
        $this->assertInstanceOf(
            AbstractService::class, 
            $this->newAnonymousClassFromAbstract->returnThis()
        );
    }
    
    public function testAbstractClassInternalMethod()
    {
        // Let's test a function declared in the Abstract Clas
        $this->assertTrue(
            $this->newAnonymousClassFromAbstract->returnTrue()
        };
    }
}