code: def test_n_frames():
      with Image.open(TEST_FILE) as im:
          assert im.n_frames == 1
          assert not im.is_animated
  
file_path: pillow-simd/Tests/test_file_dcx.py
imports: import pytest
  from PIL import DcxImagePlugin, Image
  from .helper import assert_image_equal, hopper, is_pypy
label_desc: Use image node_id 7 for calling a global function with example usage: test_n_frames() without return types