code: def testMatrix(self, encoding):
      test_value = np.array(
          [[72, 0x1F604, 108, 108, 111], [87, 0x1F604, 114, 108, 100]],
          np.int32,
      )
      expected_value = [
          "H\U0001f604llo".encode(encoding),
          "W\U0001f604rld".encode(encoding),
      ]
      unicode_encode_op = ragged_string_ops.unicode_encode(
          test_value, encoding
      )
      self.assertAllEqual(unicode_encode_op, expected_value)
  
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 8 for calling the UnicodeEncodeOpTest obj's underlying member method code with example usage: obj.testMatrix(encoding) without return types