code: def testString(self):
      indx = np.random.randint(65, high=122, size=7000)
      x = [chr(i) for i in indx]
      y, idx = array_ops.unique(x)
      tf_y, tf_idx = self.evaluate([y, idx])
  
      self.assertEqual(len(x), len(tf_idx))
      self.assertEqual(len(tf_y), len(np.unique(x)))
      for i in range(len(x)):
          self.assertEqual(x[i], tf_y[tf_idx[i]].decode("ascii"))
  
imports: import numpy
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import gen_array_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 3 for calling the UniqueTest obj's underlying member method code with example usage: obj.testString() without return types