code: def test_seed(self):
      for args in [(), (None,), (1234,), ([1234, 5678],)]:
          rg = default_rng(*args)
          assert isinstance(rg.bit_generator, PCG64)
  
imports: import os
  from os.path import join
  import sys
  import numpy
  from numpy.testing import assert_equal, assert_allclose, assert_array_equal, assert_raises
  import pytest
  from numpy.random import Generator, MT19937, PCG64, PCG64DXSM, Philox, RandomState, SeedSequence, SFC64, default_rng
  from numpy.random._common import interface
  import yatest.common
label_desc: Use image node_id 1 for calling the TestDefaultRNG obj's underlying member method code with example usage: obj.test_seed() without return types