code: def test_nested_while_loops(self, n1, type1, n2, type2):
      n1 = type1(n1)
      n2 = type1(n2)
      self.assertFunctionMatchesEager(nested_while_loops, n1, n2)
  
imports: import functools
  import itertools
  from absl.testing import parameterized
  import tensorflow
  from tensorflow.python.autograph.tests import reference_test_base
label_desc: Use image node_id 19 for calling the ReferenceTest obj's underlying member method code with example usage: obj.test_nested_while_loops(n1, type1, n2, type2) without return types