diff --git a/src/Bot/HttpClient.php b/src/Bot/HttpClient.php
index 491da2e..2f5073a 100644
--- a/src/Bot/HttpClient.php
+++ b/src/Bot/HttpClient.php
@@ -203,11 +203,15 @@ class HttpClient
      */
     private function validateRequest($class)
     {
-        $validator = Validation::createValidatorBuilder()
-            ->enableAnnotationMapping()
-            ->getValidator();
+        if (method_exists($class, 'validate')) {
+            $errors = $class->validate();
+        } else {
+            $validator = Validation::createValidatorBuilder()
+                ->enableAnnotationMapping()
+                ->getValidator();
 
-        $errors = $validator->validate($class);
+            $errors = $validator->validate($class);
+        }
 
         if ($errors->count() > 0) {
             $message = (string) $errors;
diff --git a/src/Bot/Model/Entity/Message/MessageDelivery.php b/src/Bot/Model/Entity/Message/MessageDelivery.php
index 3b0d48c..6769dcc 100644
--- a/src/Bot/Model/Entity/Message/MessageDelivery.php
+++ b/src/Bot/Model/Entity/Message/MessageDelivery.php
@@ -14,6 +14,7 @@
 namespace RetailCrm\Mg\Bot\Model\Entity\Message;
 
 use LazyJsonMapper\LazyJsonMapper;
+use Symfony\Component\Validator\Validation;
 
 /**
  * PHP version 7.0
diff --git a/tests/Bot/Tests/ClientListTest.php b/tests/Bot/Tests/ClientListTest.php
index f31604d..969a267 100644
--- a/tests/Bot/Tests/ClientListTest.php
+++ b/tests/Bot/Tests/ClientListTest.php
@@ -17,8 +17,10 @@ use RetailCrm\Mg\Bot\Model\Constants;
 use RetailCrm\Mg\Bot\Model\Entity\Channel;
 use RetailCrm\Mg\Bot\Model\Entity\Chat\Chat;
 use RetailCrm\Mg\Bot\Model\Entity\Chat\ChatMember;
+use RetailCrm\Mg\Bot\Model\Entity\Customer;
 use RetailCrm\Mg\Bot\Model\Entity\Dialog;
 use RetailCrm\Mg\Bot\Model\Entity\Message\Message;
+use RetailCrm\Mg\Bot\Model\Entity\User;
 use RetailCrm\Mg\Bot\Model\Request;
 use RetailCrm\Mg\Bot\Model\Response;
 use RetailCrm\Mg\Bot\Test\TestCase;
@@ -171,7 +173,12 @@ class ClientListTest extends TestCase
      */
     public function testUsers()
     {
-        $client = self::getApiClient();
+        $client = self::getApiClient(
+            null,
+            null,
+            false,
+            $this->getJsonResponse('users')
+        );
 
         $request = new Request\UsersRequest();
         $request->setActive(1);
@@ -179,7 +186,8 @@ class ClientListTest extends TestCase
 
         $response = $client->users($request);
 
-        print_r($response);
+        self::assertEquals(2, $response->count());
+        self::assertTrue($response[0] instanceof User);
     }
 
     /**
@@ -188,13 +196,21 @@ class ClientListTest extends TestCase
      */
     public function testDialogs()
     {
-        $client = self::getApiClient();
+        $client = self::getApiClient(
+            null,
+            null,
+            false,
+            $this->getJsonResponse('dialogs')
+        );
 
         $request = new Request\DialogsRequest();
         $request->setActive(1);
         $request->setAssign(1);
 
         $response = $client->dialogs($request);
+
+        self::assertEquals(2, $response->count());
+        self::assertTrue($response[0] instanceof Dialog);
     }
 
     /**
@@ -203,12 +219,18 @@ class ClientListTest extends TestCase
      */
     public function testCustomers()
     {
-        $client = self::getApiClient();
+        $client = self::getApiClient(
+            null,
+            null,
+            false,
+            $this->getJsonResponse('customers')
+        );
 
         $request = new Request\CustomersRequest();
 
         $response = $client->customers($request);
 
-        print_r($response);
+        self::assertEquals(2, $response->count());
+        self::assertTrue($response[0] instanceof Customer);
     }
 }
diff --git a/tests/Resources/customers.json b/tests/Resources/customers.json
new file mode 100644
index 0000000..280b478
--- /dev/null
+++ b/tests/Resources/customers.json
@@ -0,0 +1,34 @@
+[
+  {
+    "id": 39,
+    "external_id": "333296016",
+    "channel_id": 3,
+    "username": "user1",
+    "first_name": "User1",
+    "last_name": "Lastname1",
+    "created_at": "2019-06-11T12:49:26.935824Z",
+    "updated_at": "2019-06-11T14:36:20.840304Z",
+    "avatar_url": "",
+    "profile_url": "",
+    "country": "",
+    "language": "en",
+    "phone": "",
+    "email": ""
+  },
+  {
+    "id": 38,
+    "external_id": "2272664739519803",
+    "channel_id": 3,
+    "username": "user2",
+    "first_name": "User2",
+    "last_name": "Lastname2",
+    "created_at": "2019-06-11T07:34:16.079453Z",
+    "updated_at": "2019-06-13T08:07:14.898472Z",
+    "avatar_url": "",
+    "profile_url": "",
+    "country": "",
+    "language": "ru",
+    "phone": "",
+    "email": ""
+  }
+]
\ No newline at end of file
diff --git a/tests/Resources/dialogs.json b/tests/Resources/dialogs.json
new file mode 100644
index 0000000..b7e750b
--- /dev/null
+++ b/tests/Resources/dialogs.json
@@ -0,0 +1,34 @@
+[
+  {
+    "id": 60,
+    "chat_id": 30,
+    "begin_message_id": 3540,
+    "ending_message_id": 3625,
+    "created_at": "2019-06-11T12:49:26.955306Z",
+    "updated_at": "2019-06-14T14:40:28.711974Z",
+    "closed_at": "2019-06-14T14:40:28.684683Z",
+    "is_assigned": true,
+    "responsible": {
+      "type": "user",
+      "id": 12,
+      "assigned_at": "2019-06-11T12:49:34.716716Z"
+    },
+    "is_active": true
+  },
+  {
+    "id": 59,
+    "chat_id": 29,
+    "begin_message_id": 3483,
+    "ending_message_id": 3626,
+    "created_at": "2019-06-11T07:34:16.101228Z",
+    "updated_at": "2019-06-16T08:10:28.659389Z",
+    "closed_at": "2019-06-16T08:10:28.645607Z",
+    "is_assigned": true,
+    "responsible": {
+      "type": "user",
+      "id": 12,
+      "assigned_at": "2019-06-11T08:40:14.136916Z"
+    },
+    "is_active": true
+  }
+]
\ No newline at end of file
diff --git a/tests/Resources/users.json b/tests/Resources/users.json
new file mode 100644
index 0000000..4a47fa8
--- /dev/null
+++ b/tests/Resources/users.json
@@ -0,0 +1,23 @@
+[
+  {
+    "id": 1,
+    "external_id": "11",
+    "username": "User 1",
+    "first_name": "User",
+    "created_at": "2018-10-02T10:10:10.066295Z",
+    "updated_at": "2019-06-17T07:40:26.613546Z",
+    "is_online": false,
+    "is_active": true,
+    "avatar_url": "<url>"
+  },
+  {
+    "id": 2,
+    "external_id": "22",
+    "username": "User 2",
+    "first_name": "User",
+    "created_at": "2018-09-06T13:19:25.01842Z",
+    "updated_at": "2019-06-07T11:36:52.342065Z",
+    "is_online": false,
+    "is_active": true
+  }
+]
\ No newline at end of file