<?php

use PHPUnit\Framework\TestCase;

/**
 * This code snippet shows how to create spies
 * with PHPUnit's mock object as shown by
 *
 * Anna Filina - https://twitter.com/afilina
 
 * in her video
 * https://www.youtube.com/watch?v=_LeCyU1X5bY
 */
class SpyPhpUnitTest extends TestCase
{
    public function testSpyOnBar() : void
    {
        $bar = $this->getMockBuilder(Bar::class)
            ->enableProxyingToOriginalMethods()
            ->getMock();
        
        // Creating spies
        $bar->expects($spy1 = self::any())
            ->method('first');
        $bar->expects($spy2 = self::any())
            ->method('second');
        
        $val = (new Foo())->doStuff($bar);
        
        self::assertSame(1, $val);
        
        self::assertSame(1, $spy1->getInvocationCount());
        $invocation = $spy1->getInvocations()[0];
        self::assertSame([1], $invocation->getParameters());
        
        self::assertSame(0, $spy2->getInvocationCount());
    }
}

class Foo
{
    public function doStuff(Bar $bar) : int
    {
        return $bar->first(1);
    }
}

class Bar
{
    public function first(int $val) : int
    {
        return $val;
    }
    
    public function second() : int
    {
        return 2;
    }
}


Time: 00:00.008, Memory: 4.00 MB

There was 1 error:

1) SpyPhpUnitTest::testSpyOnBar
Call to undefined method PHPUnit\Framework\MockObject\Rule\AnyInvokedCount::getInvocations()

PhpunitExec.php:21

ERRORS!
Tests: 1, Assertions: 0, Errors: 1.

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