diff --git a/src/Bot/Client.php b/src/Bot/Client.php
index 1006032..31f513c 100644
--- a/src/Bot/Client.php
+++ b/src/Bot/Client.php
@@ -504,7 +504,7 @@ class Client
      */
     public function uploadFile(string $filename)
     {
-        return $this->client->uploadFileViaForm($filename);
+        return $this->client->postFile($filename);
     }
 
     /**
diff --git a/src/Bot/HttpClient.php b/src/Bot/HttpClient.php
index dea1bc3..1f392c4 100644
--- a/src/Bot/HttpClient.php
+++ b/src/Bot/HttpClient.php
@@ -182,7 +182,7 @@ class HttpClient
      *
      * @throws \Exception
      */
-    public function uploadFileViaForm(string $filename): UploadFileResponse
+    public function postFile(string $filename): UploadFileResponse
     {
         if (!file_exists($filename)) {
             throw new \InvalidArgumentException("File doesn't exist");
@@ -196,13 +196,7 @@ class HttpClient
                     'headers' => [
                         'X-Bot-Token' => $this->token
                     ],
-                    'multipart' => [
-                        [
-                            'name' => basename($filename),
-                            'filename' => basename($filename),
-                            'contents' => fopen($filename, 'r')
-                        ]
-                    ]
+                    'body' => fopen($filename, 'r')
                 ]
             );
         } catch (GuzzleException $exception) {
diff --git a/tests/Bot/Test/TestCase.php b/tests/Bot/Test/TestCase.php
index 1ede82c..c05f10e 100644
--- a/tests/Bot/Test/TestCase.php
+++ b/tests/Bot/Test/TestCase.php
@@ -114,6 +114,23 @@ class TestCase extends BaseCase
         }
     }
 
+    /**
+     * @param int    $statusCode
+     * @param array ...$errors
+     *
+     * @return Response
+     */
+    public function getErrorsResponse(int $statusCode = 400, ...$errors)
+    {
+        $json = ['errors' => []];
+
+        foreach ($errors as $error) {
+            $json['errors'][] = is_string($error) ? $error : null;
+        }
+
+        return $this->getResponse(json_encode(array_filter($json)), $statusCode);
+    }
+
     /**
      * Generate and return empty response
      *
diff --git a/tests/Bot/Tests/CommandsTest.php b/tests/Bot/Tests/CommandsTest.php
index b4a9d78..91f059d 100644
--- a/tests/Bot/Tests/CommandsTest.php
+++ b/tests/Bot/Tests/CommandsTest.php
@@ -13,8 +13,6 @@
 
 namespace RetailCrm\Mg\Bot\Tests;
 
-use Exception;
-use InvalidArgumentException;
 use RetailCrm\Common\Exception\InvalidJsonException;
 use RetailCrm\Mg\Bot\Model\Request\CommandEditRequest;
 use RetailCrm\Mg\Bot\Model\Response\ErrorOnlyResponse;
@@ -38,13 +36,13 @@ class CommandsTest extends TestCase
      */
     public function testCommandEditException()
     {
-        self::expectException(InvalidArgumentException::class);
+        self::expectException(InvalidJsonException::class);
 
         $client = self::getApiClient(
             null,
             null,
             false,
-            $this->getResponse('EOF',400)
+            $this->getResponse('EOF', 400)
         );
 
         $request = new CommandEditRequest();
@@ -59,7 +57,7 @@ class CommandsTest extends TestCase
      */
     public function testCommandDeleteException()
     {
-        self::expectException(Exception::class);
+        self::expectException(\Exception::class);
 
         $client = self::getApiClient();
 
diff --git a/tests/Bot/Tests/DialogsTest.php b/tests/Bot/Tests/DialogsTest.php
index 61ed1d5..7cfa32c 100644
--- a/tests/Bot/Tests/DialogsTest.php
+++ b/tests/Bot/Tests/DialogsTest.php
@@ -41,7 +41,7 @@ class DialogsTest extends TestCase
             null,
             null,
             false,
-            $this->getResponse('{"errors":["incorrect dialog_id"]}', 400)
+            $this->getErrorsResponse(400, "incorrect dialog_id")
         );
 
         $request = new DialogAssignRequest();
@@ -90,7 +90,7 @@ class DialogsTest extends TestCase
             null,
             null,
             false,
-            $this->getResponse('{"errors":["dialog #2131231231 not found"]}', 404)
+            $this->getErrorsResponse(404, "dialog #2131231231 not found")
         );
 
         $client->dialogClose('2131231231');
diff --git a/tests/Bot/Tests/MessagesTest.php b/tests/Bot/Tests/MessagesTest.php
index c7b5099..52c2400 100644
--- a/tests/Bot/Tests/MessagesTest.php
+++ b/tests/Bot/Tests/MessagesTest.php
@@ -39,9 +39,9 @@ class MessagesTest extends TestCase
             null,
             null,
             false,
-            $this->getResponse(
-                '{"errors":["chat_id is a required field"]}',
-                400
+            $this->getErrorsResponse(
+                400,
+                'chat_id is a required field'
             )
         );