Add SendMediaGroup method to send media albums

tests/TgBotLib/Methods/SendMediaGroupTest.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace TgBotLib\Methods;
+
+use PHPUnit\Framework\TestCase;
+use TgBotLib\Bot;
+use TgBotLib\Enums\Types\ParseMode;
+use TgBotLib\Objects\InputMedia\InputMediaPhoto;
+use TgBotLib\Objects\LinkPreviewOptions;
+use TgBotLib\Objects\Message;
+
+class SendMediaGroupTest extends TestCase
+{
+    const string TEST_IMAGE_PATH = __DIR__ . DIRECTORY_SEPARATOR . 'sample' . DIRECTORY_SEPARATOR . 'oj_simpson.png';
+    private static Bot $bot;
+
+    /**
+     * @return void
+     */
+    public static function setUpBeforeClass(): void
+    {
+        self::$bot = new Bot(BOT_TOKEN);
+        self::$bot->setAutoRetry(true);
+    }
+
+    /**
+     * Tests the `sendMessage` function of the bot instance.
+     *
+     * @return void
+     */
+    public function testSendMediaGroup(): void
+    {
+        $result = self::$bot->sendMediaGroup(
+            chat_id: TEST_CHAT_ID,
+            media: [
+                (new InputMediaPhoto())->setMedia(self::TEST_IMAGE_PATH),
+                (new InputMediaPhoto())->setMedia(self::TEST_IMAGE_PATH)
+            ]
+        );
+
+        $this->assertIsArray($result);
+
+        foreach ($result as $message)
+        {
+            $this->assertInstanceOf(Message::class, $message);
+        }
+    }
+
+}