test: Add test for TelegramBot#sendDocument() using 'fileOpts' param

References:

  * Original PR: https://github.com/yagop/node-telegram-bot-api/pull/152
  * Original Author: @evolun

test/telegram.js

@@ -522,6 +522,13 @@ describe('TelegramBot', function telegramSuite() {
         assert.ok(is.object(resp.document));
       });
     });
+    it('should send a document with custom file options', function test() {
+      const document = fs.createReadStream(`${__dirname}/data/photo.gif`);
+      const fileOpts = { filename: 'customfilename.gif' };
+      return bot.sendDocument(USERID, document, {}, fileOpts).then(resp => {
+        assert.equal(resp.document.file_name, fileOpts.filename);
+      });
+    });
   });
 
   describe('#sendSticker', function sendStickerSuite() {