Throw error if Unsupported Buffer file type. Test 'should send a video from a Buffer'

src/telegram.js

@@ -239,6 +239,9 @@ TelegramBot.prototype._formatSendData = function (type, data) {
     };
   } else if (Buffer.isBuffer(data)) {
     var filetype = fileType(data);
+    if (!filetype) {
+      throw new Error('Unsupported Buffer file type');
+    }
     formData = {};
     formData[type] = {
       value: data,

test/index.js

@@ -367,6 +367,17 @@ describe('Telegram', function () {
         done();
       });
     });
+
+    /* Currently unsupported (https://github.com/sindresorhus/file-type/pull/44)
+    it('should send a video from a Buffer', function (done) {
+      var bot = new Telegram(TOKEN);
+      var video = fs.readFileSync(__dirname+'/video.mp4');
+      bot.sendVideo(USERID, video).then(function (resp) {
+        resp.should.be.an.instanceOf(Object);
+        done();
+      });
+    });
+    */
   });
 
   describe('#sendVoice', function () {