src/telegram: Populate Stream#path from TelegramBot#getFileStream()

doc/api.md

@@ -846,12 +846,13 @@ which returns just path to file on remote server (you will have to manually buil
 
 ### telegramBot.getFileStream(fileId, [options]) ⇒ <code>stream.Readable</code>
 Return a readable stream for file.
+`fileStream.path` is the specified file ID i.e. `fileId`.
 
 This method is a sugar extension of the [getFileLink](#TelegramBot+getFileLink) method,
 which returns the full URI to the file on remote server.
 
 **Kind**: instance method of <code>[TelegramBot](#TelegramBot)</code>  
-**Returns**: <code>stream.Readable</code> - stream  
+**Returns**: <code>stream.Readable</code> - fileStream  
 
 | Param | Type | Description |
 | --- | --- | --- |

src/telegram.js

@@ -1324,16 +1324,18 @@ class TelegramBot extends EventEmitter {
 
   /**
    * Return a readable stream for file.
+   * `fileStream.path` is the specified file ID i.e. `fileId`.
    *
    * This method is a sugar extension of the [getFileLink](#TelegramBot+getFileLink) method,
    * which returns the full URI to the file on remote server.
    *
    * @param  {String} fileId File identifier to get info about
    * @param  {Object} [options] Additional Telegram query options
-   * @return {stream.Readable} stream
+   * @return {stream.Readable} fileStream
    */
   getFileStream(fileId, form = {}) {
     const fileStream = new stream.PassThrough();
+    fileStream.path = fileId;
     this.getFileLink(fileId, form)
       .then((fileURI) => {
         pump(streamedRequest({ uri: fileURI }), fileStream);

test/telegram.js

@@ -1173,6 +1173,7 @@ describe('TelegramBot', function telegramSuite() {
     it('should get a file stream', function test(done) {
       const fileStream = bot.getFileStream(FILE_ID);
       assert.ok(fileStream instanceof stream.Readable);
+      assert.equal(fileStream.path, FILE_ID);
       fileStream.pipe(concat(function readFile(buffer) {
         buffer.equals(fs.readFileSync(FILE_PATH)); // sync :(
         return done();