laravel - Mock a method in enum using PHPunit Mockery in PHP

one text

I have run into a problem when mocking Enums using Mockery + PHPUnit in PHP 8.1 (im using the laravel framework but I'm not sure this is relevant).

I have defined an enum:

<?php namespace MyNamespace\Enums;

enum MyEnum {

    case A;
    case B;

    public function method1(): string {
        return match ($this) {
            self::A => 'A',
            self::B => 'B',
        };
    }

}

I am trying to mock MyEnum. I have created a test that looks something like this:

public function testShouldCanReturnsB() {
    $mock = \Mockery::mock('\MyNamespace\Enums\MyEnum');
    $mock->shouldReceive('method1')->andReturn('B');
}

When I run the test I receive the message:

Mockery\Exception : The class \MyNamespace\Enums\MyEnum 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.

How could I mock the method inside Enum?