diff --git a/tests/unit/ClientTest.php b/tests/unit/ClientTest.php
index c1df3f4..654ece1 100644
--- a/tests/unit/ClientTest.php
+++ b/tests/unit/ClientTest.php
@@ -3,9 +3,13 @@
 
 namespace TK\Test\Unit;
 
+use TK\SDK\Exception\RequestException;
+use TK\SDK\Client;
 use TK\SDK\ValueObject\Factory\RetrieveReservationDetailParametersFactory;
 use TK\SDK\ClientBuilder;
+use TK\Test\Unit\Resources\ExampleEndpoint;
 use Dotenv;
+use ReflectionMethod;
 
 class ClientTest extends \Codeception\Test\Unit
 {
@@ -14,6 +18,9 @@ class ClientTest extends \Codeception\Test\Unit
      */
     protected $tester;
 
+    /**
+     * @var Client
+     */
     private $client;
     
     protected function _before()
@@ -67,4 +74,17 @@ public function shouldThrowExceptionForInvalidArgument() : void
     {
         $this->client->retrieveReservationDetail([]);
     }
+
+    /**
+     * @test
+     * @expectedException \TK\SDK\Exception\RequestException
+     */
+    public function shouldThrowExceptionForGuzzleRequestError() : void
+    {
+        $endpoint = new ExampleEndpoint();
+
+        $httpRequest = new ReflectionMethod($this->client, 'httpRequest');
+        $httpRequest->setAccessible(true);
+        $httpRequest->invoke($this->client, $endpoint);
+    }
 }
diff --git a/tests/unit/Resources/ExampleEndpoint.php b/tests/unit/Resources/ExampleEndpoint.php
new file mode 100644
index 0000000..08070e1
--- /dev/null
+++ b/tests/unit/Resources/ExampleEndpoint.php
@@ -0,0 +1,17 @@
+<?php
+declare(strict_types=1);
+
+namespace TK\Test\Unit\Resources;
+
+use TK\SDK\Endpoint\EndpointAbstract;
+use TK\SDK\Endpoint\EndpointInterface;
+
+class ExampleEndpoint extends EndpointAbstract implements EndpointInterface
+{
+    public function __construct()
+    {
+        $this->endpoint = '/nonExistedEndpoint';
+        $this->responseRoot = 'none';
+        $this->queryParameters = [];
+    }
+}