code: def testSmallValues(self):
      f4 = np.finfo(np.float32)
      f8 = np.finfo(np.float64)
      self._testAll(
          np.array(
              [
                  0,
                  -1,
                  1,
                  -f4.resolution,
                  f4.resolution,
                  f8.resolution,
                  -f8.resolution,
              ]
          )
      )
  
imports: import numpy
  from tensorflow.python.eager import context
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import sparse_tensor
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import gen_state_ops
  from tensorflow.python.ops import gradient_checker_v2
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import variables
  from tensorflow.python.platform import test
label_desc: Use image node_id 7 for calling the CastOpTest obj's underlying member method code with example usage: obj.testSmallValues() without return types