code: def test_read_n0(bytesmode):
      # Arrange
      with open(TEST_FILE, "rb" if bytesmode else "r") as fh:
          container = ContainerIO.ContainerIO(fh, 22, 100)
  
          # Act
          container.seek(81)
          data = container.read()
  
          # Assert
          if bytesmode:
              data = data.decode()
          assert data == "7\nThis is line 8\n"
  
file_path: pillow/Tests/test_file_container.py
imports: from __future__ import annotations
  import pytest
  from PIL import ContainerIO, Image
  from .helper import hopper
label_desc: Use image node_id 6 for calling a global function with example usage: test_read_n0(bytesmode) without return types