code: def test_init(self) -> None:
      decoder = ImageDecoder()
      assert isinstance(decoder, ImageDecoder)
  
file_path: fairseq2/tests/unit/data/image/test_image_decoder.py
imports: from pathlib import Path
  from typing import Any, Final
  import pytest
  import torch
  from fairseq2n import supports_image
  from fairseq2.data.image import ImageDecoder
  from fairseq2.memory import MemoryBlock
  from tests.common import assert_close, device
label_desc: Use image node_id 1 for calling the TestImageDecoder obj's underlying member method code with example usage: obj.test_init() without return types