fix: serialize message_ids in #forwardMessages #1215 (#1283)

* fix: forwardMessages #1215

* test: Add test for #forwardMessages()

---------

Co-authored-by: 乔瘦子m <qiaoshouzi@cfm.moe>

Author: GochoMugo

src/telegram.js

@@ -257,6 +257,13 @@ class TelegramBot extends EventEmitter {
     }
   }
 
+  _fixMessageIds(obj) {
+    const messageIds = obj.message_ids;
+    if (messageIds && typeof messageIds !== 'string') {
+      obj.message_ids = stringify(messageIds);
+    }
+  }
+
   /**
    * Fix 'reply_parameters' parameter by making it JSON-serialized, as
    * required by the Telegram Bot API
@@ -290,6 +297,7 @@ class TelegramBot extends EventEmitter {
       this._fixReplyMarkup(options.form);
       this._fixEntitiesField(options.form);
       this._fixReplyParameters(options.form);
+      this._fixMessageIds(options.form);
     }
     if (options.qs) {
       this._fixReplyMarkup(options.qs);

test/telegram.js

@@ -625,6 +625,28 @@ describe('TelegramBot', function telegramSuite() {
     });
   });
 
+  describe('#forwardMessages', function forwardMessagesSuite() {
+    before(function before() {
+      utils.handleRatelimit(bot, 'sendMessage', this);
+      utils.handleRatelimit(bot, 'forwardMessages', this);
+    });
+    it('should forward multiple messages', function test() {
+      return Promise.all([
+        bot.sendMessage(USERID, 'test 1'),
+        bot.sendMessage(USERID, 'test 2'),
+      ]).then(responses => {
+        const messageIds = [
+          responses[0].message_id,
+          responses[1].message_id,
+        ].sort();
+        return bot.forwardMessages(GROUPID, USERID, messageIds).then(forwarded => {
+          assert.ok(is.array(forwarded));
+          assert.ok(forwarded.length === 2);
+        });
+      });
+    });
+  });
+
   describe('#copyMessage', function copyMessageSuite() {
     before(function before() {
       utils.handleRatelimit(bot, 'sendMessage', this);