4.5 WebTestCase $environment BC break

[mikysan]

Preconditions

1. PHP 8.0
2. Symfony 5.4
3. liip/functional-test-bundle 4.5

Steps to reproduce

1. rename Symfony test environment to testing
2. create a test like following

namespace App\Tests;

use Liip\FunctionalTestBundle\Test\WebTestCase;

class FunctionalTestCase extends WebTestCase
{
    protected $environment = 'testing';

    public function testFoo()
    {
        $this->assertTrue(true);
    }
}

Expected result

The test should pass or at least should be failing with a proper error message or deprecation warning

Actual result

test fail with You have requested a non-existent parameter "secret". error message.