diff --git a/src/ModelFactory.php b/src/ModelFactory.php
index 0fcacf7..b6b7b86 100644
--- a/src/ModelFactory.php
+++ b/src/ModelFactory.php
@@ -137,7 +137,7 @@ class ModelFactory
 
         return new UpdateList(
             $updateObjects,
-            $data['marker'] ?? null,
+            $data['marker'] ? (int)$data['marker'] : null,
         );
     }
 
diff --git a/src/Models/UpdateList.php b/src/Models/UpdateList.php
index 2f17390..c0fb06f 100644
--- a/src/Models/UpdateList.php
+++ b/src/Models/UpdateList.php
@@ -20,4 +20,18 @@ final readonly class UpdateList extends AbstractModel
         public ?int $marker,
     ) {
     }
+
+    /**
+     * Overridden to prevent incorrect usage.
+     * UpdateList contains polymorphic objects and must be created via ModelFactory.
+     *
+     * @param array<string, mixed> $data
+     * @throws \LogicException Always.
+     */
+    public static function fromArray(array $data): static
+    {
+        throw new \LogicException(
+            'Cannot create UpdateList directly from an array. Use ModelFactory::createUpdateList() instead.'
+        );
+    }
 }
diff --git a/src/WebhookHandler.php b/src/WebhookHandler.php
index c91db58..ce65522 100644
--- a/src/WebhookHandler.php
+++ b/src/WebhookHandler.php
@@ -68,6 +68,7 @@ final class WebhookHandler
      * @param callable(Models\Updates\BotStartedUpdate, Api): void $handler
      *
      * @return $this
+     * @codeCoverageIgnore
      */
     public function onBotStarted(callable $handler): self
     {
diff --git a/tests/ApiTest.php b/tests/ApiTest.php
index 76b82ac..5523e85 100644
--- a/tests/ApiTest.php
+++ b/tests/ApiTest.php
@@ -29,6 +29,7 @@ use BushlanovDev\MaxMessengerBot\Models\Sender;
 use BushlanovDev\MaxMessengerBot\Models\Subscription;
 use BushlanovDev\MaxMessengerBot\Models\UpdateList;
 use BushlanovDev\MaxMessengerBot\Models\UploadEndpoint;
+use BushlanovDev\MaxMessengerBot\WebhookHandler;
 use InvalidArgumentException;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\Test;
@@ -56,6 +57,7 @@ use ReflectionClass;
 #[UsesClass(UploadEndpoint::class)]
 #[UsesClass(Chat::class)]
 #[UsesClass(UpdateList::class)]
+#[UsesClass(WebhookHandler::class)]
 final class ApiTest extends TestCase
 {
     private MockObject&ClientApiInterface $clientMock;
@@ -546,4 +548,24 @@ final class ApiTest extends TestCase
 
         $this->api->getUpdates();
     }
+
+    #[Test]
+    public function createWebhookHandlerReturnsInstanceWithProvidedSecret(): void
+    {
+        $secret = 'my-test-secret-key';
+        $webhookHandler = $this->api->createWebhookHandler($secret);
+
+        $this->assertInstanceOf(WebhookHandler::class, $webhookHandler);
+
+        $reflection = new ReflectionClass($webhookHandler);
+
+        $apiProperty = $reflection->getProperty('api');
+        $this->assertSame($this->api, $apiProperty->getValue($webhookHandler));
+
+        $factoryProperty = $reflection->getProperty('modelFactory');
+        $this->assertSame($this->modelFactoryMock, $factoryProperty->getValue($webhookHandler));
+
+        $secretProperty = $reflection->getProperty('secret');
+        $this->assertSame($secret, $secretProperty->getValue($webhookHandler));
+    }
 }
diff --git a/tests/Models/Attachments/Buttons/OpenAppButtonTest.php b/tests/Models/Attachments/Buttons/OpenAppButtonTest.php
index aa96ebf..6e288df 100644
--- a/tests/Models/Attachments/Buttons/OpenAppButtonTest.php
+++ b/tests/Models/Attachments/Buttons/OpenAppButtonTest.php
@@ -11,7 +11,7 @@ use PHPUnit\Framework\Attributes\Test;
 use PHPUnit\Framework\TestCase;
 
 #[CoversClass(OpenAppButton::class)]
-class OpenAppButtonTest extends TestCase
+final class OpenAppButtonTest extends TestCase
 {
     #[Test]
     public function toArraySerializesCorrectly(): void
diff --git a/tests/Models/Attachments/Payloads/InlineKeyboardPayloadTest.php b/tests/Models/Attachments/Payloads/InlineKeyboardPayloadTest.php
new file mode 100644
index 0000000..0f1b764
--- /dev/null
+++ b/tests/Models/Attachments/Payloads/InlineKeyboardPayloadTest.php
@@ -0,0 +1,88 @@
+<?php
+
+declare(strict_types=1);
+
+namespace BushlanovDev\MaxMessengerBot\Tests\Models\Attachments\Payloads;
+
+use BushlanovDev\MaxMessengerBot\Enums\ButtonType;
+use BushlanovDev\MaxMessengerBot\Enums\Intent;
+use BushlanovDev\MaxMessengerBot\Models\Attachments\Buttons\CallbackButton;
+use BushlanovDev\MaxMessengerBot\Models\Attachments\Buttons\LinkButton;
+use BushlanovDev\MaxMessengerBot\Models\Attachments\Payloads\InlineKeyboardPayload;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\Attributes\UsesClass;
+use PHPUnit\Framework\TestCase;
+
+#[CoversClass(InlineKeyboardPayload::class)]
+#[UsesClass(CallbackButton::class)]
+#[UsesClass(LinkButton::class)]
+final class InlineKeyboardPayloadTest extends TestCase
+{
+    #[Test]
+    public function constructionAndPropertyAccess(): void
+    {
+        $buttons = [
+            [new CallbackButton('Test', 'payload')],
+        ];
+        $payload = new InlineKeyboardPayload($buttons);
+
+        $this->assertInstanceOf(InlineKeyboardPayload::class, $payload);
+        $this->assertSame($buttons, $payload->buttons);
+    }
+
+    #[Test]
+    public function toArraySerializesCorrectly(): void
+    {
+        $buttons = [
+            [new CallbackButton('Accept', 'accept_payload', Intent::Positive)],
+            [
+                new CallbackButton('Decline', 'decline_payload', Intent::Negative),
+                new LinkButton('Help', 'https://example.com/help'),
+            ],
+        ];
+        $payload = new InlineKeyboardPayload($buttons);
+
+        $resultArray = $payload->toArray();
+
+        $expectedArray = [
+            'buttons' => [
+                [
+                    [
+                        'type' => ButtonType::Callback->value,
+                        'text' => 'Accept',
+                        'payload' => 'accept_payload',
+                        'intent' => Intent::Positive->value,
+                    ],
+                ],
+                [
+                    [
+                        'type' => ButtonType::Callback->value,
+                        'text' => 'Decline',
+                        'payload' => 'decline_payload',
+                        'intent' => Intent::Negative->value,
+                    ],
+                    [
+                        'type' => ButtonType::Link->value,
+                        'text' => 'Help',
+                        'url' => 'https://example.com/help',
+                    ],
+                ],
+            ],
+        ];
+
+        $this->assertEquals($expectedArray, $resultArray);
+    }
+
+    #[Test]
+    public function toArrayHandlesEmptyButtonsArray(): void
+    {
+        $payload = new InlineKeyboardPayload([]);
+        $resultArray = $payload->toArray();
+
+        $expectedArray = [
+            'buttons' => [],
+        ];
+        $this->assertEquals($expectedArray, $resultArray);
+    }
+}
diff --git a/tests/Models/Attachments/Payloads/PhotoAttachmentPayloadTest.php b/tests/Models/Attachments/Payloads/PhotoAttachmentPayloadTest.php
new file mode 100644
index 0000000..cd24af6
--- /dev/null
+++ b/tests/Models/Attachments/Payloads/PhotoAttachmentPayloadTest.php
@@ -0,0 +1,108 @@
+<?php
+
+declare(strict_types=1);
+
+namespace BushlanovDev\MaxMessengerBot\Tests\Models\Attachments\Payloads;
+
+use BushlanovDev\MaxMessengerBot\Attributes\ArrayOf;
+use BushlanovDev\MaxMessengerBot\Models\Attachments\Payloads\PhotoAttachmentPayload;
+use BushlanovDev\MaxMessengerBot\Models\Attachments\Payloads\PhotoToken;
+use InvalidArgumentException;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\Attributes\UsesClass;
+use PHPUnit\Framework\TestCase;
+
+#[CoversClass(PhotoAttachmentPayload::class)]
+#[UsesClass(PhotoToken::class)]
+#[UsesClass(ArrayOf::class)]
+final class PhotoAttachmentPayloadTest extends TestCase
+{
+    #[Test]
+    public function canBeCreatedWithUrlOnly(): void
+    {
+        $payload = new PhotoAttachmentPayload(url: 'https://example.com/photo.jpg');
+
+        $this->assertSame('https://example.com/photo.jpg', $payload->url);
+        $this->assertNull($payload->token);
+        $this->assertNull($payload->photos);
+
+        $expectedArray = [
+            'url' => 'https://example.com/photo.jpg',
+            'token' => null,
+            'photos' => null,
+        ];
+        $this->assertEquals($expectedArray, $payload->toArray());
+    }
+
+    #[Test]
+    public function canBeCreatedWithTokenOnly(): void
+    {
+        $payload = new PhotoAttachmentPayload(token: 'uploaded_token_abc');
+
+        $this->assertSame('uploaded_token_abc', $payload->token);
+        $this->assertNull($payload->url);
+        $this->assertNull($payload->photos);
+
+        $expectedArray = [
+            'token' => 'uploaded_token_abc',
+            'url' => null,
+            'photos' => null,
+        ];
+        $this->assertEquals($expectedArray, $payload->toArray());
+    }
+
+    #[Test]
+    public function canBeCreatedWithPhotosOnly(): void
+    {
+        $photos = [
+            new PhotoToken('token_1'),
+            new PhotoToken('token_2'),
+        ];
+        $payload = new PhotoAttachmentPayload(photos: $photos);
+
+        $this->assertSame($photos, $payload->photos);
+        $this->assertNull($payload->url);
+        $this->assertNull($payload->token);
+
+        $expectedArray = [
+            'photos' => [
+                ['token' => 'token_1'],
+                ['token' => 'token_2'],
+            ],
+            'url' => null,
+            'token' => null,
+        ];
+        $this->assertEquals($expectedArray, $payload->toArray());
+    }
+
+    /**
+     * Data provider for invalid constructor arguments.
+     *
+     * @return array<string, array{0: string|null, 1: string|null, 2: array|null}>
+     */
+    public static function invalidPayloadProvider(): array
+    {
+        return [
+            'all null (no arguments)' => [null, null, null],
+            'url and token provided' => ['https://a.com', 'token123', null],
+            'url and photos provided' => ['https://a.com', null, [new PhotoToken('t')]],
+            'token and photos provided' => [null, 'token123', [new PhotoToken('t')]],
+            'all three arguments provided' => ['https://a.com', 'token123', [new PhotoToken('t')]],
+        ];
+    }
+
+    #[Test]
+    #[DataProvider('invalidPayloadProvider')]
+    public function constructorThrowsExceptionForInvalidArguments(
+        ?string $url,
+        ?string $token,
+        ?array $photos
+    ): void {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('Provide exactly one of "url", "token", or "photos" for PhotoAttachmentPayload.');
+
+        new PhotoAttachmentPayload($url, $token, $photos);
+    }
+}
diff --git a/tests/Models/Attachments/Payloads/PhotoTokenTest.php b/tests/Models/Attachments/Payloads/PhotoTokenTest.php
new file mode 100644
index 0000000..18642e5
--- /dev/null
+++ b/tests/Models/Attachments/Payloads/PhotoTokenTest.php
@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace BushlanovDev\MaxMessengerBot\Tests\Models\Attachments\Payloads;
+
+use BushlanovDev\MaxMessengerBot\Models\Attachments\Payloads\PhotoToken;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\TestCase;
+
+#[CoversClass(PhotoToken::class)]
+final class PhotoTokenTest extends TestCase
+{
+    #[Test]
+    public function itCorrectlyHandlesCreationSerializationAndState(): void
+    {
+        $tokenValue = 'some_unique_token_string_123';
+        $rawData = ['token' => $tokenValue];
+
+        $photoToken = PhotoToken::fromArray($rawData);
+
+        $this->assertInstanceOf(PhotoToken::class, $photoToken);
+        $this->assertSame($tokenValue, $photoToken->token);
+
+        $serializedData = $photoToken->toArray();
+        $this->assertEquals($rawData, $serializedData);
+
+        $directInstance = new PhotoToken($tokenValue);
+        $this->assertSame($tokenValue, $directInstance->token);
+    }
+}
diff --git a/tests/Models/Attachments/Requests/InlineKeyboardAttachmentRequestTest.php b/tests/Models/Attachments/Requests/InlineKeyboardAttachmentRequestTest.php
new file mode 100644
index 0000000..f2d0f0f
--- /dev/null
+++ b/tests/Models/Attachments/Requests/InlineKeyboardAttachmentRequestTest.php
@@ -0,0 +1,127 @@
+<?php
+
+declare(strict_types=1);
+
+namespace BushlanovDev\MaxMessengerBot\Tests\Models\Attachments\Requests;
+
+use BushlanovDev\MaxMessengerBot\Enums\AttachmentType;
+use BushlanovDev\MaxMessengerBot\Enums\ButtonType;
+use BushlanovDev\MaxMessengerBot\Enums\Intent;
+use BushlanovDev\MaxMessengerBot\Models\Attachments\Buttons\AbstractButton;
+use BushlanovDev\MaxMessengerBot\Models\Attachments\Buttons\CallbackButton;
+use BushlanovDev\MaxMessengerBot\Models\Attachments\Buttons\LinkButton;
+use BushlanovDev\MaxMessengerBot\Models\Attachments\Payloads\InlineKeyboardPayload;
+use BushlanovDev\MaxMessengerBot\Models\Attachments\Requests\InlineKeyboardAttachmentRequest;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\Attributes\UsesClass;
+use PHPUnit\Framework\TestCase;
+
+#[CoversClass(InlineKeyboardAttachmentRequest::class)]
+#[UsesClass(InlineKeyboardPayload::class)]
+#[UsesClass(AbstractButton::class)]
+#[UsesClass(CallbackButton::class)]
+#[UsesClass(LinkButton::class)]
+final class InlineKeyboardAttachmentRequestTest extends TestCase
+{
+    #[Test]
+    public function createsCorrectRequestAndSerializesToArray(): void
+    {
+        $buttons = [
+            [new CallbackButton('Press Me', 'cb_payload_1')],
+            [new LinkButton('Docs', 'https://dev.max.ru')],
+        ];
+        $request = new InlineKeyboardAttachmentRequest($buttons);
+
+        $this->assertInstanceOf(InlineKeyboardAttachmentRequest::class, $request);
+        $this->assertSame(AttachmentType::InlineKeyboard, $request->type);
+        $this->assertInstanceOf(InlineKeyboardPayload::class, $request->payload);
+        $this->assertSame($buttons, $request->payload->buttons);
+
+        $expectedArray = [
+            'type' => 'inline_keyboard',
+            'payload' => [
+                'buttons' => [
+                    [
+                        [
+                            'type' => ButtonType::Callback->value,
+                            'text' => 'Press Me',
+                            'payload' => 'cb_payload_1',
+                            'intent' => null,
+                        ],
+                    ],
+                    [
+                        [
+                            'type' => ButtonType::Link->value,
+                            'text' => 'Docs',
+                            'url' => 'https://dev.max.ru',
+                        ],
+                    ],
+                ],
+            ],
+        ];
+
+        $this->assertEquals($expectedArray, $request->toArray());
+    }
+
+    #[Test]
+    public function handlesJaggedAndMultiButtonRows(): void
+    {
+        $buttons = [
+            [new CallbackButton('Positive', 'ok', Intent::Positive)],
+            [
+                new CallbackButton('Negative', 'no', Intent::Negative),
+                new LinkButton('Help', 'https://example.com/help'),
+            ],
+        ];
+        $request = new InlineKeyboardAttachmentRequest($buttons);
+
+        $expectedArray = [
+            'type' => 'inline_keyboard',
+            'payload' => [
+                'buttons' => [
+                    [
+                        [
+                            'type' => ButtonType::Callback->value,
+                            'text' => 'Positive',
+                            'payload' => 'ok',
+                            'intent' => Intent::Positive->value,
+                        ],
+                    ],
+                    [
+                        [
+                            'type' => ButtonType::Callback->value,
+                            'text' => 'Negative',
+                            'payload' => 'no',
+                            'intent' => Intent::Negative->value,
+                        ],
+                        [
+                            'type' => ButtonType::Link->value,
+                            'text' => 'Help',
+                            'url' => 'https://example.com/help',
+                        ],
+                    ],
+                ],
+            ],
+        ];
+
+        $this->assertEquals($expectedArray, $request->toArray());
+    }
+
+    #[Test]
+    public function canBeCreatedWithEmptyButtonsArray(): void
+    {
+        $buttons = [];
+        $request = new InlineKeyboardAttachmentRequest($buttons);
+
+        $this->assertEmpty($request->payload->buttons);
+
+        $expectedArray = [
+            'type' => 'inline_keyboard',
+            'payload' => [
+                'buttons' => $buttons,
+            ],
+        ];
+        $this->assertEquals($expectedArray, $request->toArray());
+    }
+}
diff --git a/tests/Models/Attachments/Requests/PhotoAttachmentRequestTest.php b/tests/Models/Attachments/Requests/PhotoAttachmentRequestTest.php
new file mode 100644
index 0000000..dfbc5c4
--- /dev/null
+++ b/tests/Models/Attachments/Requests/PhotoAttachmentRequestTest.php
@@ -0,0 +1,126 @@
+<?php
+
+declare(strict_types=1);
+
+namespace BushlanovDev\MaxMessengerBot\Tests\Models\Attachments\Requests;
+
+use BushlanovDev\MaxMessengerBot\Enums\AttachmentType;
+use BushlanovDev\MaxMessengerBot\Models\Attachments\Payloads\PhotoAttachmentPayload;
+use BushlanovDev\MaxMessengerBot\Models\Attachments\Payloads\PhotoToken;
+use BushlanovDev\MaxMessengerBot\Models\Attachments\Requests\PhotoAttachmentRequest;
+use InvalidArgumentException;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\Attributes\UsesClass;
+use PHPUnit\Framework\TestCase;
+
+#[CoversClass(PhotoAttachmentRequest::class)]
+#[UsesClass(PhotoAttachmentPayload::class)]
+#[UsesClass(PhotoToken::class)]
+final class PhotoAttachmentRequestTest extends TestCase
+{
+    #[Test]
+    public function testFromUrl(): void
+    {
+        $url = 'https://example.com/image.jpg';
+        $request = PhotoAttachmentRequest::fromUrl($url);
+
+        $this->assertInstanceOf(PhotoAttachmentRequest::class, $request);
+        $this->assertSame(AttachmentType::Image, $request->type);
+        $this->assertInstanceOf(PhotoAttachmentPayload::class, $request->payload);
+        $this->assertSame($url, $request->payload->url);
+        $this->assertNull($request->payload->token);
+        $this->assertNull($request->payload->photos);
+
+        $expectedArray = [
+            'type' => 'image',
+            'payload' => [
+                'url' => $url,
+                'token' => null,
+                'photos' => null,
+            ],
+        ];
+        $this->assertEquals($expectedArray, $request->toArray());
+    }
+
+    #[Test]
+    public function testFromToken(): void
+    {
+        $token = 'some_upload_token_12345';
+        $request = PhotoAttachmentRequest::fromToken($token);
+
+        $this->assertInstanceOf(PhotoAttachmentRequest::class, $request);
+        $this->assertSame(AttachmentType::Image, $request->type);
+        $this->assertInstanceOf(PhotoAttachmentPayload::class, $request->payload);
+        $this->assertSame($token, $request->payload->token);
+        $this->assertNull($request->payload->url);
+        $this->assertNull($request->payload->photos);
+
+        $expectedArray = [
+            'type' => 'image',
+            'payload' => [
+                'token' => $token,
+                'url' => null,
+                'photos' => null,
+            ],
+        ];
+        $this->assertEquals($expectedArray, $request->toArray());
+    }
+
+    #[Test]
+    public function testFromPhotos(): void
+    {
+        $photos = [
+            new PhotoToken('token_A'),
+            new PhotoToken('token_B'),
+        ];
+        $request = PhotoAttachmentRequest::fromPhotos($photos);
+
+        $this->assertInstanceOf(PhotoAttachmentRequest::class, $request);
+        $this->assertSame(AttachmentType::Image, $request->type);
+        $this->assertInstanceOf(PhotoAttachmentPayload::class, $request->payload);
+        $this->assertSame($photos, $request->payload->photos);
+        $this->assertNull($request->payload->url);
+        $this->assertNull($request->payload->token);
+
+        $expectedArray = [
+            'type' => 'image',
+            'payload' => [
+                'photos' => [
+                    ['token' => 'token_A'],
+                    ['token' => 'token_B'],
+                ],
+                'url' => null,
+                'token' => null,
+            ],
+        ];
+        $this->assertEquals($expectedArray, $request->toArray());
+    }
+
+    /**
+     * @return array<string, array{0: string|null, 1: string|null, 2: array|null}>
+     */
+    public static function invalidPayloadProvider(): array
+    {
+        return [
+            'no arguments' => [null, null, null],
+            'url and token' => ['http://a.com', 'token123', null],
+            'token and photos' => [null, 'token123', [new PhotoToken('t')]],
+            'all arguments' => ['http://a.com', 'token123', [new PhotoToken('t')]],
+        ];
+    }
+
+    #[Test]
+    #[DataProvider('invalidPayloadProvider')]
+    public function payloadThrowsExceptionWhenNotExactlyOneArgumentIsProvided(
+        ?string $url,
+        ?string $token,
+        ?array $photos
+    ): void {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('Provide exactly one of "url", "token", or "photos" for PhotoAttachmentPayload.');
+
+        new PhotoAttachmentPayload($url, $token, $photos);
+    }
+}
diff --git a/tests/Models/UpdateListTest.php b/tests/Models/UpdateListTest.php
new file mode 100644
index 0000000..8129272
--- /dev/null
+++ b/tests/Models/UpdateListTest.php
@@ -0,0 +1,64 @@
+<?php
+
+declare(strict_types=1);
+
+namespace BushlanovDev\MaxMessengerBot\Tests\Models;
+
+use BushlanovDev\MaxMessengerBot\Enums\UpdateType;
+use BushlanovDev\MaxMessengerBot\ModelFactory;
+use BushlanovDev\MaxMessengerBot\Models\Message;
+use BushlanovDev\MaxMessengerBot\Models\MessageBody;
+use BushlanovDev\MaxMessengerBot\Models\Recipient;
+use BushlanovDev\MaxMessengerBot\Models\UpdateList;
+use BushlanovDev\MaxMessengerBot\Models\Updates\MessageCreatedUpdate;
+use LogicException;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\Attributes\UsesClass;
+use PHPUnit\Framework\TestCase;
+
+#[CoversClass(UpdateList::class)]
+#[UsesClass(ModelFactory::class)]
+#[UsesClass(MessageCreatedUpdate::class)]
+#[UsesClass(Message::class)]
+#[UsesClass(MessageBody::class)]
+#[UsesClass(Recipient::class)]
+final class UpdateListTest extends TestCase
+{
+    #[Test]
+    public function factoryCorrectlyCreatesUpdateList(): void
+    {
+        $data = [
+            'updates' => [
+                [
+                    'update_type' => UpdateType::MessageCreated->value,
+                    'timestamp' => 1678886400000,
+                    'message' => [
+                        'timestamp' => 1678886400000,
+                        'body' => ['mid' => 'mid.123', 'seq' => 1, 'text' => 'Hello'],
+                        'recipient' => ['chat_type' => 'dialog', 'user_id' => 123],
+                    ],
+                    'user_locale' => 'ru-RU',
+                ],
+            ],
+            'marker' => 1,
+        ];
+
+        $factory = new ModelFactory();
+        $updateList = $factory->createUpdateList($data);
+
+        $this->assertInstanceOf(UpdateList::class, $updateList);
+        $this->assertCount(1, $updateList->updates);
+        $this->assertInstanceOf(MessageCreatedUpdate::class, $updateList->updates[0]);
+        $this->assertSame(1, $updateList->marker);
+    }
+
+    #[Test]
+    public function directCallToFromArrayThrowsException(): void
+    {
+        $this->expectException(LogicException::class);
+        $this->expectExceptionMessageMatches('/Cannot create .* directly from an array/');
+
+        UpdateList::fromArray(['updates' => [], 'marker' => 1]);
+    }
+}
diff --git a/tests/Models/Updates/BotStartedUpdateTest.php b/tests/Models/Updates/BotStartedUpdateTest.php
new file mode 100644
index 0000000..979ae99
--- /dev/null
+++ b/tests/Models/Updates/BotStartedUpdateTest.php
@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+namespace BushlanovDev\MaxMessengerBot\Tests\Models\Updates;
+
+use BushlanovDev\MaxMessengerBot\Enums\UpdateType;
+use BushlanovDev\MaxMessengerBot\Models\Updates\BotStartedUpdate;
+use BushlanovDev\MaxMessengerBot\Models\User;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\Attributes\UsesClass;
+use PHPUnit\Framework\TestCase;
+
+#[CoversClass(BotStartedUpdate::class)]
+#[UsesClass(User::class)]
+final class BotStartedUpdateTest extends TestCase
+{
+    #[Test]
+    public function canBeCreatedFromArray(): void
+    {
+        $data = [
+            'update_type' => UpdateType::BotStarted->value,
+            'timestamp' => 1678886400000,
+            'chat_id' => 123,
+            'user' => [
+                'user_id' => 123,
+                'first_name' => 'John',
+                'last_name' => 'Doe',
+                'is_bot' => false,
+                'last_activity_time' => 1678886400000,
+                'avatar_url' => 'https://example.com/avatar.jpg',
+            ],
+            'user_locale' => 'ru-ru',
+        ];
+
+        $update = BotStartedUpdate::fromArray($data);
+
+        $this->assertInstanceOf(BotStartedUpdate::class, $update);
+        $this->assertSame(UpdateType::BotStarted, $update->updateType);
+        $this->assertSame(123, $update->user->userId);
+        $this->assertSame('John', $update->user->firstName);
+        $this->assertSame('Doe', $update->user->lastName);
+        $this->assertSame('https://example.com/avatar.jpg', $update->user->avatarUrl);
+        $this->assertSame('ru-ru', $update->userLocale);
+    }
+}
diff --git a/tests/Models/Updates/MessageCreatedUpdateTest.php b/tests/Models/Updates/MessageCreatedUpdateTest.php
index 4e3eccc..cc6cd2d 100644
--- a/tests/Models/Updates/MessageCreatedUpdateTest.php
+++ b/tests/Models/Updates/MessageCreatedUpdateTest.php
@@ -18,7 +18,7 @@ use PHPUnit\Framework\TestCase;
 #[UsesClass(Message::class)]
 #[UsesClass(MessageBody::class)]
 #[UsesClass(Recipient::class)]
-class MessageCreatedUpdateTest extends TestCase
+final class MessageCreatedUpdateTest extends TestCase
 {
     #[Test]
     public function canBeCreatedFromArray(): void