fix issue with passing envs into the container. Remove container registry usage.

tests/Integration/RedisContainerTest.php

@@ -4,33 +4,30 @@ declare(strict_types=1);
 
 namespace Testcontainers\Tests\Integration;
 
-use PHPUnit\Framework\TestCase;
-use Testcontainers\Container\GenericContainer;
-use Testcontainers\Registry;
+use Predis\Client;
+use Testcontainers\Container\RedisContainer;
 
-class RedisContainerTest extends TestCase
+class RedisContainerTest extends ContainerTestCase
 {
-//    public static function tearDownAfterClass(): void
-//    {
-//        parent::tearDownAfterClass();
-//
-//        Registry::cleanup();
-//    }
+    public static function setUpBeforeClass(): void
+    {
+        self::$container = (new RedisContainer())
+            ->start();
+    }
 
     public function testRedisContainer(): void
     {
-        $redisContainer = (new GenericContainer('redis:alpine'))
-            ->withExposedPorts(6379)
-            ->start();
-
-        $redisClient = new \Predis\Client([
+        $redisClient = new Client([
             'host' => 'localhost',
             'port' => 6379,
         ]);
 
+        $redisClient->ping();
+
+        $this->assertTrue($redisClient->isConnected());
+
         $redisClient->set('greetings', 'Hello, World!');
 
         $this->assertEquals('Hello, World!', $redisClient->get('greetings'));
-        $redisContainer->remove();
     }
 }