code: def test_L(self):
      self.assert_pack("L", "L", 1, 1, 2, 3, 4)
      self.assert_pack("L", "L;16", b"\x00\xc6\x00\xaf", 198, 175)
      self.assert_pack("L", "L;16B", b"\xc6\x00\xaf\x00", 198, 175)
  
imports: from __future__ import annotations
  import sys
  import pytest
  from PIL import Image
label_desc: Use image node_id 3 for calling the TestLibPack obj's underlying member method code with example usage: obj.test_L() without return types