Setup requirements During the unit testing, if enabled, please disable the Xdebug on your PHP CLI config. PHPRedis: https://github.com/phpredis/phpredis The testings use two types of connection, Redis standalone and Redis cluster. Each connection uses a different docker image. Redis standalone , run the below command: docker run --name redis -p 6380 : 6379 -d redis:alpine Redis cluster Clone this repo: https://github.com/meirzamoodle/middleware-tutorials-redis-cluster-tls/tree/main#usage and please follow the instructions on Usage section. Note This bug needs to be tested with 2 versions of PHPRedis: 5.3.7 and 6.0.2 To install PHPRedis with a specific version, do as below: git clone https://github.com/phpredis/phpredis.git cd phpredis git checkout tags/ [Target_Version] -b [Target_Version] phpize ./configure make && make install Add extension=redis.so to your php.ini file Restart PHP and Apache/Nginx service Redis standalone // Session Open config.php and add the below codes:  define(   'TEST_SESSION_REDIS_HOST' ,   '127.0.0.1:6380' ); VERIFY all the tests in lib/tests/session/redis_test.php are passed. mdk phpunit -r -u lib/tests/session/redis_test.php or vendor/bin/phpunit lib/tests/session/redis_test.php Redis Cluster // Session Open config.php and add the below codes: define(   'TEST_SESSION_REDIS_HOSTCLUSTER' ,   '172.23.0.11,172.23.0.12,172.23.0.13,172.23.0.14,172.23.0.15,172.23.0.16' ); define(   'TEST_SESSION_REDIS_ENCRYPTCLUSTER' ,   [ 'verify_peer' => false , 'verify_peer_name' => false ], ); define(   'TEST_SESSION_REDIS_AUTHCLUSTER' ,   'foobared' ); VERIFY all the tests in lib/tests/session_redis_cluster_test.php are passed. mdk phpunit -r -u lib/tests/session_redis_cluster_test.php or vendor/bin/phpunit lib/tests/session_redis_cluster_test.php Redis standalone // Cache store Open config.php and add the below codes: define(   'TEST_CACHESTORE_REDIS_TESTSERVERS' ,   '127.0.0.1:6380' ); VERIFY all the tests in cache/stores/redis/tests/cachestore_redis_test.php are passed. mdk phpunit -r -u cache/stores/redis/tests/cachestore_redis_test.php or vendor/bin/phpunit cache/stores/redis/tests/cachestore_redis_test.php Redis Cluster // Cache store Open config.php and add the below codes: define(   'TEST_CACHESTORE_REDIS_SERVERSCLUSTER' ,   '172.23.0.11,172.23.0.12,172.23.0.13,172.23.0.14,172.23.0.15,172.23.0.16' ); define(   'TEST_CACHESTORE_REDIS_ENCRYPTCLUSTER' ,   true ); define(   'TEST_CACHESTORE_REDIS_AUTHCLUSTER' ,   'foobared' ); VERIFY  all the tests in cache/stores/redis/tests/cachestore_cluster_redis_test.php are passed. mdk phpunit -r -u cache/stores/redis/tests/cachestore_cluster_redis_test.php or vendor/bin/phpunit cache/stores/redis/tests/cachestore_cluster_redis_test.php