The class \Closure is marked final and its methods cannot be replaced.

[4n70w4]

Other final classes mocked sucessfully. But \Closure from PHP core don't mocked =(

https://www.php.net/manual/en/class.closure.php

    public function test() {
       BypassFinals::enable(
       Mockery::mock(\Closure::class)
    }

Mockery\Exception: The class \Closure is marked final and its methods cannot be replaced. Classes marked final can be passed in to \Mockery::mock() as instantiated objects to create a partial mock, but only if the mock is not subject to type hinting checks.

/var/www/app/vendor/mockery/mockery/library/Mockery/Generator/MockConfiguration.php:332
/var/www/app/vendor/mockery/mockery/library/Mockery/Generator/MockConfiguration.php:434
/var/www/app/vendor/mockery/mockery/library/Mockery/Generator/StringManipulationGenerator.php:74
/var/www/app/vendor/mockery/mockery/library/Mockery/Generator/CachingGenerator.php:40
/var/www/app/vendor/mockery/mockery/library/Mockery/Container.php:221
/var/www/app/vendor/mockery/mockery/library/Mockery.php:114

    public function test() {
       BypassFinals::enable(
       $this->createMock(\Closure::class);
    }

Class "Closure" is declared "final" and cannot be mocked.

composer info | grep dg

dg/bypass-finals                                 v1.2.1                                Removes final keyword from source code on-the-fly and allows moc...

composer info | grep phpunit

phpunit/php-code-coverage                        8.0.2                                 Library that provides collection, processing, and rendering func...
phpunit/php-file-iterator                        3.0.4                                 FilterIterator implementation that filters files based on a list...
phpunit/php-invoker                              3.0.2                                 Invoke callables with a timeout
phpunit/php-text-template                        2.0.2                                 Simple template engine.
phpunit/php-timer                                3.1.4                                 Utility class for timing
phpunit/php-token-stream                         4.0.3                                 Wrapper around PHP's tokenizer extension.
phpunit/phpunit                                  9.1.5                                 The PHP Unit Testing framework.
rregeer/phpunit-coverage-check                   0.3.1                                 Check the code coverage using the clover report of phpunit

php -v

PHP 7.4.3 (cli) (built: Feb 18 2020 11:53:05) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
    with Zend OPcache v7.4.3, Copyright (c), by Zend Technologies
    with Xdebug v2.9.2, Copyright (c) 2002-2020, by Derick Rethans

[dg]

Unfortunately, this is a system limitation and there is nothing you can do about it.

[4n70w4]

@dg description about limitations would like to see the notes in the readme, and not waste time to asking.

[dg]

I did not realize that there is such a limitation.