code: def test_get_rng(self):
      try:
          get_rng("a")
      except ValueError:
          assert True
  
imports: import unittest
  import numpy
  import numpy.testing
  import scipy.sparse
  from cornac.utils.common import sigmoid
  from cornac.utils.common import safe_indexing
  from cornac.utils.common import validate_format
  from cornac.utils.common import scale
  from cornac.utils.common import clip
  from cornac.utils.common import excepts
  from cornac.utils.common import intersects
  from cornac.utils.common import estimate_batches
  from cornac.utils.common import get_rng
  from cornac.utils.common import normalize
label_desc: Use image node_id 9 for calling the TestCommon obj's underlying member method code with example usage: obj.test_get_rng() without return types