class_docstr: Test cases for tf.strings.upper.
code: def test_string_upper_unicode(self):
      strings = [["óósschloë"]]
      with self.cached_session():
          output = string_ops.string_upper(strings, encoding="utf-8")
          output = self.evaluate(output)
          # output: "ÓÓSSCHLOË"
          self.assertAllEqual(
              output, [[b"\xc3\x93\xc3\x93SSCHLO\xc3\x8b"]]
          )
  
imports: from tensorflow.python.ops import string_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 3 for calling the StringUpperOpTest obj's underlying member method code with example usage: obj.test_string_upper_unicode() without return types