<?php

use PHPUnit\Framework\TestCase;

class MockClassNameTest extends TestCase
{
    public function testMockClassName() : void
    {
        $mock = $this->getMockBuilder('FooAbstract')
            ->setMockClassName('Foo')
            ->getMock();
        $mock->expects($this->once())
            ->method('fooey')
            ->willReturn(2);
        
        $foo = new Foo();
        
        $this->assertInstanceOf('FooAbstract', $mock);
        $this->assertInstanceOf('Foo', $mock);
        $this->assertSame(2, $mock->fooey());
        
        $this->assertInstanceOf('FooAbstract', $foo);
        $this->assertInstanceOf('Foo', $foo);
        $this->assertNull($foo->fooey());
    }
}

abstract class FooAbstract
{
    public function fooey()
    {
        return 1;
    }
}

Time: 00:00.007, Memory: 18.00 MB

OK (1 test, 0 assertions)

• PHPUnit 4 Annotations
• Test your Traits in PHPUnit
• PHPUnit - Using a value map for mocked functions with more than 1 return value

PHP 8.2, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8