code: def test_P(self):
      self.assert_unpack("P", "P;1", b"\xe4", 1, 1, 1, 0, 0, 1, 0, 0)
      self.assert_unpack("P", "P;2", b"\xe4", 3, 2, 1, 0)
      # erroneous?
      # self.assert_unpack("P", "P;2L", b'\xe4', 1, 1, 1, 0)
      self.assert_unpack("P", "P;4", b"\x02\xef", 0, 2, 14, 15)
      # erroneous?
      # self.assert_unpack("P", "P;4L", b'\x02\xef', 2, 10, 10, 0)
      self.assert_unpack("P", "P", 1, 1, 2, 3, 4)
      self.assert_unpack("P", "P;R", 1, 128, 64, 192, 32)
  
imports: import sys
  import pytest
  from PIL import Image
label_desc: Use image node_id 6 for calling the TestLibUnpack obj's underlying member method code with example usage: obj.test_P() without return types