symfony-bundles / redis-bundle

Tests/Kernel.php

<?php

namespace SymfonyBundles\RedisBundle\Tests;

class Kernel
{
    /**
     * @var Fixtures\app\AppKernel
     */
    private static $instance;

    /**
     * @return Fixtures\app\AppKernel
     */
    public static function make(): Fixtures\app\AppKernel
    {
        if (null === static::$instance) {

Since $instance is declared private, accessing it with static will lead to errors in possible sub-classes; you can either use self, or increase the visibility of $instance to at least protected.

            static::$instance = new Fixtures\app\AppKernel('test', true);

            static::$instance->boot();
        }

        return static::$instance;
    }
}