code: def test_emacs_insert_comment():
      # Test insert-comment (M-#) binding.
      result, cli = _feed_cli_with_input(
          "hello\x1b#", check_line_ending=False
      )
      assert result.text == "#hello"
  
      result, cli = _feed_cli_with_input(
          "hello\rworld\x1b#", check_line_ending=False, multiline=True
      )
      assert result.text == "#hello\n#world"
  
imports: from __future__ import annotations
  from functools import partial
  import pytest
  from prompt_toolkit.clipboard import ClipboardData, InMemoryClipboard
  from prompt_toolkit.enums import EditingMode
  from prompt_toolkit.filters import ViInsertMode
  from prompt_toolkit.history import InMemoryHistory
  from prompt_toolkit.input.defaults import create_pipe_input
  from prompt_toolkit.input.vt100_parser import ANSI_SEQUENCES
  from prompt_toolkit.key_binding.bindings.named_commands import prefix_meta
  from prompt_toolkit.key_binding.key_bindings import KeyBindings
  from prompt_toolkit.output import DummyOutput
  from prompt_toolkit.shortcuts import PromptSession
label_desc: Use image node_id 18 for calling a global function with example usage: test_emacs_insert_comment() without return types