diff --git a/src/ContainerRuntime/ContainerRuntimeClient.php b/src/ContainerRuntime/ContainerRuntimeClient.php
new file mode 100644
index 0000000..5728217
--- /dev/null
+++ b/src/ContainerRuntime/ContainerRuntimeClient.php
@@ -0,0 +1,45 @@
+<?php
+
+namespace Testcontainers\ContainerRuntime;
+
+use Docker\Docker as DockerClient;
+
+class ContainerRuntimeClient
+{
+    /**
+     * @var DockerClient|null Singleton instance of DockerClient
+     */
+    private static ?DockerClient $dockerClient = null;
+
+    /**
+     * Private constructor to prevent creating instance outside the class.
+     */
+    private function __construct()
+    {
+    }
+
+    /**
+     * Returns the singleton DockerClient instance.
+     *
+     * @return DockerClient The singleton DockerClient instance.
+     * @throws \RuntimeException If the DockerClient instance could not be created.
+     */
+    public static function getDockerClient(): DockerClient
+    {
+        if (self::$dockerClient === null) {
+            self::$dockerClient = DockerClient::create();
+        }
+
+        return self::$dockerClient;
+    }
+
+    /**
+     * Injects a DockerClient instance for testing or special use cases.
+     *
+     * @param DockerClient $client The DockerClient instance to set.
+     */
+    public static function setDockerClient(DockerClient $client): void
+    {
+        self::$dockerClient = $client;
+    }
+}
diff --git a/tests/Integration/ContainerTestCase.php b/tests/Integration/ContainerTestCase.php
new file mode 100644
index 0000000..5f83c64
--- /dev/null
+++ b/tests/Integration/ContainerTestCase.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Testcontainers\Tests\Integration;
+
+use PHPUnit\Framework\TestCase;
+use Testcontainers\Container\GenericContainer;
+
+abstract class ContainerTestCase extends TestCase
+{
+    protected static GenericContainer $container;
+
+    protected function tearDown(): void
+    {
+        self::$container->remove();
+    }
+}
diff --git a/tests/Integration/MariaDBContainerTest.php b/tests/Integration/MariaDBContainerTest.php
new file mode 100644
index 0000000..f0629a7
--- /dev/null
+++ b/tests/Integration/MariaDBContainerTest.php
@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Testcontainers\Tests\Integration;
+
+use Testcontainers\Container\MariaDBContainer;
+
+class MariaDBContainerTest extends ContainerTestCase
+{
+    public static function setUpBeforeClass(): void
+    {
+        self::$container = (new MariaDBContainer())
+            ->withMariaDBDatabase('foo')
+            ->withMariaDBUser('bar', 'baz')
+            ->start();
+    }
+
+    public function testMySQLContainer(): void
+    {
+        $pdo = new \PDO(
+            sprintf('mysql:host=%s;port=3306', self::$container->getAddress()),
+            'bar',
+            'baz',
+        );
+
+        $query = $pdo->query('SHOW databases');
+
+        $this->assertInstanceOf(\PDOStatement::class, $query);
+
+        $databases = $query->fetchAll(\PDO::FETCH_COLUMN);
+
+        $this->assertContains('foo', $databases);
+    }
+}
diff --git a/tests/Integration/MySQLContainerTest.php b/tests/Integration/MySQLContainerTest.php
new file mode 100644
index 0000000..d625a90
--- /dev/null
+++ b/tests/Integration/MySQLContainerTest.php
@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Testcontainers\Tests\Integration;
+
+use Testcontainers\Container\MySQLContainer;
+
+class MySQLContainerTest extends ContainerTestCase
+{
+    public static function setUpBeforeClass(): void
+    {
+        self::$container = (new MySQLContainer())
+            ->withMySQLDatabase('foo')
+            ->withMySQLUser('bar', 'baz')
+            ->start();
+    }
+
+    public function testMySQLContainer(): void
+    {
+        $pdo = new \PDO(
+            sprintf('mysql:host=%s;port=3306', self::$container->getAddress()),
+            'bar',
+            'baz',
+        );
+
+        $query = $pdo->query('SHOW databases');
+
+        $this->assertInstanceOf(\PDOStatement::class, $query);
+
+        $databases = $query->fetchAll(\PDO::FETCH_COLUMN);
+
+        $this->assertContains('foo', $databases);
+    }
+}
diff --git a/tests/Integration/OpenSearchContainerTest.php b/tests/Integration/OpenSearchContainerTest.php
new file mode 100644
index 0000000..92fd1cb
--- /dev/null
+++ b/tests/Integration/OpenSearchContainerTest.php
@@ -0,0 +1,38 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Testcontainers\Tests\Integration;
+
+use Testcontainers\Container\OpenSearchContainer;
+
+class OpenSearchContainerTest extends ContainerTestCase
+{
+    public static function setUpBeforeClass(): void
+    {
+        self::$container = (new OpenSearchContainer())
+            ->withDisabledSecurityPlugin()
+            ->start();
+    }
+
+    /**
+     * @throws \JsonException
+     */
+    public function testOpenSearch(): void
+    {
+        $ch = curl_init();
+        curl_setopt($ch, CURLOPT_URL, sprintf('http://%s:%d', self::$container->getAddress(), 9200));
+        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+
+        $response = (string) curl_exec($ch);
+
+        $this->assertNotEmpty($response);
+
+        /** @var array{cluster_name: string} $data */
+        $data = json_decode($response, true, JSON_THROW_ON_ERROR, JSON_THROW_ON_ERROR);
+
+        $this->assertArrayHasKey('cluster_name', $data);
+
+        $this->assertEquals('docker-cluster', $data['cluster_name']);
+    }
+}
diff --git a/tests/Integration/PostgreSQLContainerTest.php b/tests/Integration/PostgreSQLContainerTest.php
new file mode 100644
index 0000000..7691435
--- /dev/null
+++ b/tests/Integration/PostgreSQLContainerTest.php
@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Testcontainers\Tests\Integration;
+
+use Testcontainers\Container\PostgresContainer;
+
+class PostgreSQLContainerTest extends ContainerTestCase
+{
+    public static function setUpBeforeClass(): void
+    {
+        self::$container = (new PostgresContainer('latest', 'test'))
+            ->withPostgresUser('test')
+            ->withPostgresDatabase('foo')
+            ->start();
+    }
+
+    public function testPostgreSQLContainer(): void
+    {
+        $pdo = new \PDO(
+            sprintf('pgsql:host=%s;port=5432;dbname=foo', self::$container->getAddress()),
+            'test',
+            'test',
+        );
+
+        $query = $pdo->query('SELECT datname FROM pg_database');
+
+        $this->assertInstanceOf(\PDOStatement::class, $query);
+
+        $databases = $query->fetchAll(\PDO::FETCH_COLUMN);
+
+        $this->assertContains('foo', $databases);
+    }
+}