code: def testScalar(self):
      with self.cached_session():
          with self.assertRaises(ValueError):
              ragged_string_ops.unicode_encode(72, "UTF-8")
      with self.cached_session():
          with self.assertRaises(ValueError):
              ragged_string_ops.unicode_encode(
                  constant_op.constant(72), "UTF-8"
              )
  
imports: from absl.testing import parameterized
  import numpy
  from tensorflow.python.eager import def_function
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import errors_impl
  from tensorflow.python.framework import tensor_spec
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops.ragged import ragged_factory_ops
  from tensorflow.python.ops.ragged import ragged_string_ops
  from tensorflow.python.ops.ragged import ragged_tensor
  from tensorflow.python.ops.ragged import ragged_tensor_value
  from tensorflow.python.platform import test
label_desc: Use image node_id 2 for calling the UnicodeEncodeOpTest obj's underlying member method code with example usage: obj.testScalar() without return types