code: def test_while_basic(self, target, x, type_, a):
      x = type_(x)
      self.assertFunctionMatchesEager(target, x, a, 0)
  
imports: import itertools
  from absl.testing import parameterized
  import tensorflow
  from tensorflow.python.autograph.tests import reference_test_base
label_desc: Use image node_id 4 for calling the ReferenceTest obj's underlying member method code with example usage: obj.test_while_basic(target, x, type_, a) without return types