code: def test_large_bitmasks(self):
      bitstring = "0b" + "1" * 5678
      mask = BitMask.from_bin(bitstring)
      mask_as_bitstring = mask.to_bin()
      self.assertEqual(mask_as_bitstring, bitstring)
  
imports: import unittest
  from copy import deepcopy
  from random import randint, random, seed
  from lightly.api.bitmask import BitMask
label_desc: Use image node_id 3 for calling the TestBitMask obj's underlying member method code with example usage: obj.test_large_bitmasks() without return types