Add SendPhoto method for sending photos in TgBotLib

tests/TgBotLib/Methods/SendPhotoTest.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace TgBotLib\Methods;
+
+use PHPUnit\Framework\TestCase;
+use TgBotLib\Bot;
+use TgBotLib\Enums\Types\ParseMode;
+use TgBotLib\Objects\LinkPreviewOptions;
+use TgBotLib\Objects\Message;
+
+class SendPhotoTest extends TestCase
+{
+    const string TEST_IMAGE_PATH = __DIR__ . DIRECTORY_SEPARATOR . 'sample' . DIRECTORY_SEPARATOR . 'oj_simpson.png';
+    const string TEST_IMAGE_URL = 'https://avatars.githubusercontent.com/u/22669599';
+    private static Bot $bot;
+
+    /**
+     * @return void
+     */
+    public static function setUpBeforeClass(): void
+    {
+        self::$bot = new Bot(BOT_TOKEN);
+    }
+
+    /**
+     * Tests the `sendMessage` function of the bot instance.
+     *
+     * @return void
+     */
+    public function testSendPhoto(): void
+    {
+        $result = self::$bot->sendPhoto(
+            chat_id: TEST_CHAT_ID,
+            photo: self::TEST_IMAGE_PATH,
+            caption: 'Test Unit: testSendPhoto',
+        );
+
+        $this->assertInstanceOf(Message::class, $result);
+        $this->assertEquals('Test Unit: testSendPhoto', $result->getCaption());
+    }
+
+    /**
+     * Tests the `sendPhoto` function of the bot instance with a URL.
+     *
+     * @return void
+     */
+    public function testSendPhotoWithUrl(): void
+    {
+        $result = self::$bot->sendPhoto(
+            chat_id: TEST_CHAT_ID,
+            photo: self::TEST_IMAGE_URL,
+            caption: 'Test Unit: testSendPhotoWithUrl',
+        );
+
+        $this->assertInstanceOf(Message::class, $result);
+        $this->assertEquals('Test Unit: testSendPhotoWithUrl', $result->getCaption());
+    }
+}