Use `::class` where possible.

tests/unit/Commands/CommandTest.php

@@ -13,6 +13,7 @@ namespace Longman\TelegramBot\Tests\Unit\Commands;
 use Longman\TelegramBot\Telegram;
 use Longman\TelegramBot\Tests\Unit\TestCase;
 use Longman\TelegramBot\Tests\Unit\TestHelpers;
+use Longman\TelegramBot\Commands\Command;
 
 /**
  * @package         TelegramTest
@@ -26,7 +27,7 @@ class CommandTest extends TestCase
     /**
      * @var string
      */
-    private $command_namespace = 'Longman\TelegramBot\Commands\Command';
+    private $command_namespace = Command::class;
 
     /**
      * @var \Longman\TelegramBot\Telegram

tests/unit/Entities/AudioTest.php

@@ -34,7 +34,7 @@ class AudioTest extends TestCase
     public function testInstance()
     {
         $audio = new Audio($this->record);
-        self::assertInstanceOf('Longman\TelegramBot\Entities\Audio', $audio);
+        self::assertInstanceOf(Audio::class, $audio);
     }
 
     public function testGetProperties()

tests/unit/Entities/FileTest.php

@@ -38,7 +38,7 @@ class FileTest extends TestCase
     public function testBaseStageLocation()
     {
         $file = new File($this->data);
-        $this->assertInstanceOf('Longman\TelegramBot\Entities\File', $file);
+        $this->assertInstanceOf(File::class, $file);
     }
 
     public function testGetFileId()

tests/unit/Entities/LocationTest.php

@@ -34,7 +34,7 @@ class LocationTest extends TestCase
     public function testBaseStageLocation()
     {
         $location = new Location($this->coordinates);
-        $this->assertInstanceOf('Longman\TelegramBot\Entities\Location', $location);
+        $this->assertInstanceOf(Location::class, $location);
     }
 
     public function testGetLongitude()

tests/unit/Entities/ServerResponseTest.php

@@ -15,6 +15,12 @@ namespace Longman\TelegramBot\Tests\Unit;
 use Longman\TelegramBot\Entities\Message;
 use Longman\TelegramBot\Entities\ServerResponse;
 use Longman\TelegramBot\Request;
+use Longman\TelegramBot\Entities\Sticker;
+use Longman\TelegramBot\Entities\StickerSet;
+use Longman\TelegramBot\Entities\File;
+use Longman\TelegramBot\Entities\PhotoSize;
+use Longman\TelegramBot\Entities\UserProfilePhotos;
+use Longman\TelegramBot\Entities\Update;
 
 /**
  * @package         TelegramTest
@@ -54,7 +60,7 @@ class ServerResponseTest extends TestCase
         self::assertTrue($server->isOk());
         self::assertNull($server->getErrorCode());
         self::assertNull($server->getDescription());
-        self::assertInstanceOf('\Longman\TelegramBot\Entities\Message', $server_result);
+        self::assertInstanceOf(Message::class, $server_result);
 
         //Message
         self::assertEquals('1234', $server_result->getMessageId());
@@ -181,7 +187,7 @@ class ServerResponseTest extends TestCase
         $server = new ServerResponse(json_decode($result, true), 'testbot');
 
         self::assertCount(4, $server->getResult());
-        self::assertInstanceOf('\Longman\TelegramBot\Entities\Update', $server->getResult()[0]);
+        self::assertInstanceOf(Update::class, $server->getResult()[0]);
     }
 
     public function getUpdatesEmpty()
@@ -239,8 +245,8 @@ class ServerResponseTest extends TestCase
         //Photo size count
         self::assertCount(3, $photos[0]);
 
-        self::assertInstanceOf('\Longman\TelegramBot\Entities\UserProfilePhotos', $server_result);
-        self::assertInstanceOf('\Longman\TelegramBot\Entities\PhotoSize', $photos[0][0]);
+        self::assertInstanceOf(UserProfilePhotos::class, $server_result);
+        self::assertInstanceOf(PhotoSize::class, $photos[0][0]);
     }
 
     public function getFile()
@@ -261,7 +267,7 @@ class ServerResponseTest extends TestCase
         $result = $this->getFile();
         $server = new ServerResponse(json_decode($result, true), 'testbot');
 
-        self::assertInstanceOf('\Longman\TelegramBot\Entities\File', $server->getResult());
+        self::assertInstanceOf(File::class, $server->getResult());
     }
 
     public function testSetGeneralTestFakeResponse()
@@ -287,7 +293,7 @@ class ServerResponseTest extends TestCase
         self::assertTrue($server->isOk());
         self::assertNull($server->getErrorCode());
         self::assertNull($server->getDescription());
-        self::assertInstanceOf('\Longman\TelegramBot\Entities\Message', $server_result);
+        self::assertInstanceOf(Message::class, $server_result);
 
         //Message
         self::assertEquals('1234', $server_result->getMessageId());
@@ -365,13 +371,13 @@ class ServerResponseTest extends TestCase
 
         $server_result = $server->getResult();
 
-        self::assertInstanceOf('\Longman\TelegramBot\Entities\StickerSet', $server_result);
+        self::assertInstanceOf(StickerSet::class, $server_result);
         self::assertEquals('stickerset_name', $server_result->getName());
         self::assertEquals('Some name', $server_result->getTitle());
         self::assertFalse($server_result->getContainsMasks());
 
         $stickers = $server_result->getStickers();
         self::assertCount(4, $stickers);
-        self::assertInstanceOf('\Longman\TelegramBot\Entities\Sticker', $stickers[0]);
+        self::assertInstanceOf(Sticker::class, $stickers[0]);
     }
 }

tests/unit/Entities/UserTest.php

@@ -24,7 +24,7 @@ class UserTest extends TestCase
     public function testInstance()
     {
         $user = new User(['id' => 1]);
-        self::assertInstanceOf('Longman\TelegramBot\Entities\User', $user);
+        self::assertInstanceOf(User::class, $user);
     }
 
     public function testGetId()

tests/unit/Entities/WebhookInfoTest.php

@@ -42,7 +42,7 @@ class WebhookInfoTest extends TestCase
     public function testBaseStageWebhookInfo()
     {
         $webhook = new WebhookInfo($this->data);
-        $this->assertInstanceOf('Longman\TelegramBot\Entities\WebhookInfo', $webhook);
+        $this->assertInstanceOf(WebhookInfo::class, $webhook);
     }
 
     public function testGetUrl()

tests/unit/TelegramLogTest.php

@@ -36,7 +36,7 @@ class TelegramLogTest extends TestCase
     protected function setUp()
     {
         // Make sure no monolog instance is set before each test.
-        TestHelpers::setStaticProperty('Longman\TelegramBot\TelegramLog', 'monolog', null);
+        TestHelpers::setStaticProperty(TelegramLog::class, 'monolog', null);
     }
 
     protected function tearDown()