test::func doesn't work I expected

[sapsaldog]

I am not sure I just misunderstand how to use "test:func"

but those tests are not working as I expect

<?php

namespace NDS\LeapMarketing\Util\FileFunctions;

class TestClass
{
    public static function test(string $target)
    {
        return strlen($target);
    }
}

<?php

namespace demo;

use AspectMock\Test as test;
use NDS\LeapMarketing\Util\FileFunctions\TestClass;

class AspectMockTest extends \PHPUnit\Framework\TestCase
{
    protected function tearDown(): void
    {
        test::clean(); // remove all registered test doubles
    }

    public function testFunc0()
    {
        $this->assertEquals(TestClass::test('haha'), 4);
    }

    public function testFunc1()
    {
        test::func('NDS\LeapMarketing\Util\FileFunctions', 'strlen', 10);

        $this->assertEquals(TestClass::test('haha'), 10);
    }

    public function testFunc2()
    {
        test::func('NDS\LeapMarketing\Util\FileFunctions', 'strlen', 3);

        $this->assertEquals(TestClass::test('haha'), 3);
    }
}

The result of the tests is like below

PHPUnit 9.5.21 #StandWithUkraine

.FF                                                                 3 / 3 (100%)

Time: 00:00.104, Memory: 8.00 MB

There were 2 failures:

1) demo\AspectMockTest::testFunc1
Failed asserting that 10 matches expected 4.

/mnt/devvm/projects/leaf-marketing/tests/unit/Util/FileFunctions/AspectMockTest.php:25
phpvfscomposer:///mnt/devvm/projects/leaf-marketing/vendor/phpunit/phpunit/phpunit:97

2) demo\AspectMockTest::testFunc2
Failed asserting that 3 matches expected 4.

/mnt/devvm/projects/leaf-marketing/tests/unit/Util/FileFunctions/AspectMockTest.php:32
phpvfscomposer:///mnt/devvm/projects/leaf-marketing/vendor/phpunit/phpunit/phpunit:97

FAILURES!
Tests: 3, Assertions: 3, Failures: 2.

if I move the testFunc0 to the bottom, the test does work.

[sapsaldog]

I think I found a workaround.

I guess this is because of the initial loading mechanism.

add this function to a PHPUnit test class

    protected function setUp(): void
    {
        test::func('\NDS\LeapMarketing\Util\FileFunctions', 'strlen', function($target){
            return strlen($target);
        });
    }