diff --git a/tests/Adapters/MongoDatabaseAdapterTest.php b/tests/Adapters/MongoDatabaseAdapterTest.php
new file mode 100644
index 0000000..5ac3fc1
--- /dev/null
+++ b/tests/Adapters/MongoDatabaseAdapterTest.php
@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Maatify\DataAdapters\Tests\Adapters;
+
+use Maatify\DataAdapters\Adapters\Mongo\MongoDatabaseAdapter;
+use Maatify\DataAdapters\Contracts\Adapter\AdapterInterface;
+use PHPUnit\Framework\TestCase;
+
+class MongoDatabaseAdapterTest extends TestCase
+{
+    protected function setUp(): void
+    {
+        if (! class_exists('MongoDB\Database')) {
+            $this->markTestSkipped('MongoDB\Database class is not available.');
+        }
+    }
+
+    public function test_it_implements_adapter_interface(): void
+    {
+        $driver = $this->createStub('MongoDB\Database');
+        $adapter = new MongoDatabaseAdapter($driver);
+
+        $this->assertInstanceOf(AdapterInterface::class, $adapter);
+    }
+
+    public function test_construction_and_get_driver(): void
+    {
+        $driver = $this->createStub('MongoDB\Database');
+        $adapter = new MongoDatabaseAdapter($driver);
+
+        $this->assertSame($driver, $adapter->getDriver());
+    }
+
+    public function test_get_driver_returns_correct_type(): void
+    {
+        $driver = $this->createStub('MongoDB\Database');
+        $adapter = new MongoDatabaseAdapter($driver);
+
+        $this->assertInstanceOf('MongoDB\Database', $adapter->getDriver());
+    }
+
+    public function test_repeated_calls_return_same_instance(): void
+    {
+        $driver = $this->createStub('MongoDB\Database');
+        $adapter = new MongoDatabaseAdapter($driver);
+
+        $first = $adapter->getDriver();
+        $second = $adapter->getDriver();
+
+        $this->assertSame($first, $second);
+    }
+}
diff --git a/tests/Adapters/MySQLDBALAdapterTest.php b/tests/Adapters/MySQLDBALAdapterTest.php
new file mode 100644
index 0000000..c698f34
--- /dev/null
+++ b/tests/Adapters/MySQLDBALAdapterTest.php
@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Maatify\DataAdapters\Tests\Adapters;
+
+use Maatify\DataAdapters\Adapters\MySQL\MySQLDBALAdapter;
+use Maatify\DataAdapters\Contracts\Adapter\AdapterInterface;
+use PHPUnit\Framework\TestCase;
+
+class MySQLDBALAdapterTest extends TestCase
+{
+    protected function setUp(): void
+    {
+        if (! class_exists('Doctrine\DBAL\Connection')) {
+            $this->markTestSkipped('Doctrine DBAL Connection class is not available.');
+        }
+    }
+
+    public function test_it_implements_adapter_interface(): void
+    {
+        $driver = $this->createStub('Doctrine\DBAL\Connection');
+        $adapter = new MySQLDBALAdapter($driver);
+
+        $this->assertInstanceOf(AdapterInterface::class, $adapter);
+    }
+
+    public function test_construction_and_get_driver(): void
+    {
+        $driver = $this->createStub('Doctrine\DBAL\Connection');
+        $adapter = new MySQLDBALAdapter($driver);
+
+        $this->assertSame($driver, $adapter->getDriver());
+    }
+
+    public function test_get_driver_returns_correct_type(): void
+    {
+        $driver = $this->createStub('Doctrine\DBAL\Connection');
+        $adapter = new MySQLDBALAdapter($driver);
+
+        $this->assertInstanceOf('Doctrine\DBAL\Connection', $adapter->getDriver());
+    }
+
+    public function test_repeated_calls_return_same_instance(): void
+    {
+        $driver = $this->createStub('Doctrine\DBAL\Connection');
+        $adapter = new MySQLDBALAdapter($driver);
+
+        $first = $adapter->getDriver();
+        $second = $adapter->getDriver();
+
+        $this->assertSame($first, $second);
+    }
+}
diff --git a/tests/Adapters/MySQLPDOAdapterTest.php b/tests/Adapters/MySQLPDOAdapterTest.php
new file mode 100644
index 0000000..cd06720
--- /dev/null
+++ b/tests/Adapters/MySQLPDOAdapterTest.php
@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Maatify\DataAdapters\Tests\Adapters;
+
+use Maatify\DataAdapters\Adapters\MySQL\MySQLPDOAdapter;
+use Maatify\DataAdapters\Contracts\Adapter\AdapterInterface;
+use PHPUnit\Framework\TestCase;
+
+class MySQLPDOAdapterTest extends TestCase
+{
+    protected function setUp(): void
+    {
+        if (! class_exists(\PDO::class)) {
+            $this->markTestSkipped('PDO class is not available.');
+        }
+    }
+
+    public function test_it_implements_adapter_interface(): void
+    {
+        $driver = $this->createStub(\PDO::class);
+        $adapter = new MySQLPDOAdapter($driver);
+
+        $this->assertInstanceOf(AdapterInterface::class, $adapter);
+    }
+
+    public function test_construction_and_get_driver(): void
+    {
+        $driver = $this->createStub(\PDO::class);
+        $adapter = new MySQLPDOAdapter($driver);
+
+        $this->assertSame($driver, $adapter->getDriver());
+    }
+
+    public function test_get_driver_returns_correct_type(): void
+    {
+        $driver = $this->createStub(\PDO::class);
+        $adapter = new MySQLPDOAdapter($driver);
+
+        $this->assertInstanceOf(\PDO::class, $adapter->getDriver());
+    }
+
+    public function test_repeated_calls_return_same_instance(): void
+    {
+        $driver = $this->createStub(\PDO::class);
+        $adapter = new MySQLPDOAdapter($driver);
+
+        $first = $adapter->getDriver();
+        $second = $adapter->getDriver();
+
+        $this->assertSame($first, $second);
+    }
+}
diff --git a/tests/Adapters/RedisAdapterTest.php b/tests/Adapters/RedisAdapterTest.php
new file mode 100644
index 0000000..d2e0b85
--- /dev/null
+++ b/tests/Adapters/RedisAdapterTest.php
@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Maatify\DataAdapters\Tests\Adapters;
+
+use Maatify\DataAdapters\Adapters\Redis\RedisAdapter;
+use Maatify\DataAdapters\Contracts\Adapter\AdapterInterface;
+use PHPUnit\Framework\TestCase;
+
+class RedisAdapterTest extends TestCase
+{
+    protected function setUp(): void
+    {
+        if (! class_exists(\Redis::class)) {
+            $this->markTestSkipped('Redis class is not available.');
+        }
+    }
+
+    public function test_it_implements_adapter_interface(): void
+    {
+        $driver = $this->createStub(\Redis::class);
+        $adapter = new RedisAdapter($driver);
+
+        $this->assertInstanceOf(AdapterInterface::class, $adapter);
+    }
+
+    public function test_construction_and_get_driver(): void
+    {
+        $driver = $this->createStub(\Redis::class);
+        $adapter = new RedisAdapter($driver);
+
+        $this->assertSame($driver, $adapter->getDriver());
+    }
+
+    public function test_get_driver_returns_correct_type(): void
+    {
+        $driver = $this->createStub(\Redis::class);
+        $adapter = new RedisAdapter($driver);
+
+        $this->assertInstanceOf(\Redis::class, $adapter->getDriver());
+    }
+
+    public function test_repeated_calls_return_same_instance(): void
+    {
+        $driver = $this->createStub(\Redis::class);
+        $adapter = new RedisAdapter($driver);
+
+        $first = $adapter->getDriver();
+        $second = $adapter->getDriver();
+
+        $this->assertSame($first, $second);
+    }
+}
diff --git a/tests/Adapters/RedisPredisAdapterTest.php b/tests/Adapters/RedisPredisAdapterTest.php
new file mode 100644
index 0000000..55de73c
--- /dev/null
+++ b/tests/Adapters/RedisPredisAdapterTest.php
@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Maatify\DataAdapters\Tests\Adapters;
+
+use Maatify\DataAdapters\Adapters\Redis\RedisPredisAdapter;
+use Maatify\DataAdapters\Contracts\Adapter\AdapterInterface;
+use PHPUnit\Framework\TestCase;
+
+class RedisPredisAdapterTest extends TestCase
+{
+    protected function setUp(): void
+    {
+        if (! class_exists('Predis\Client')) {
+            $this->markTestSkipped('Predis\Client class is not available.');
+        }
+    }
+
+    public function test_it_implements_adapter_interface(): void
+    {
+        $driver = $this->createStub('Predis\Client');
+        $adapter = new RedisPredisAdapter($driver);
+
+        $this->assertInstanceOf(AdapterInterface::class, $adapter);
+    }
+
+    public function test_construction_and_get_driver(): void
+    {
+        $driver = $this->createStub('Predis\Client');
+        $adapter = new RedisPredisAdapter($driver);
+
+        $this->assertSame($driver, $adapter->getDriver());
+    }
+
+    public function test_get_driver_returns_correct_type(): void
+    {
+        $driver = $this->createStub('Predis\Client');
+        $adapter = new RedisPredisAdapter($driver);
+
+        $this->assertInstanceOf('Predis\Client', $adapter->getDriver());
+    }
+
+    public function test_repeated_calls_return_same_instance(): void
+    {
+        $driver = $this->createStub('Predis\Client');
+        $adapter = new RedisPredisAdapter($driver);
+
+        $first = $adapter->getDriver();
+        $second = $adapter->getDriver();
+
+        $this->assertSame($first, $second);
+    }
+}