docstr: Presigned file URL should have a unique ID.
docstr_tok: ["Presigned","file","URL","should","have","a","unique","ID","."]
code: def test_added_file_id(self):
      """Presigned file URL should have a unique ID."""
      info1, info2 = self.mgr.get_upload_urls(
          "session", ["name1", "name1"]
      )
      self.assertNotEqual(info1.file_id, info2.file_id)
  
file_path: streamlit/lib/tests/streamlit/runtime/uploaded_file_manager_test.py
imports: import unittest
  from streamlit.runtime.memory_uploaded_file_manager import MemoryUploadedFileManager
  from streamlit.runtime.stats import CacheStat
  from streamlit.runtime.uploaded_file_manager import UploadedFileRec
  from tests.exception_capturing_thread import call_on_threads
label_desc: Use image node_id 2 for calling the UploadedFileManagerTest obj's underlying member method code with example usage: obj.test_added_file_id() without return types