code: def test_simple_string_schema(self):
      expected_string = "test string"
      simple_string_schema = SimpleStringSchema()
      self.assertEqual(
          expected_string.encode(encoding="utf-8"),
          simple_string_schema._j_serialization_schema.serialize(
              expected_string
          ),
      )
  
      self.assertEqual(
          expected_string,
          simple_string_schema._j_deserialization_schema.deserialize(
              expected_string.encode(encoding="utf-8")
          ),
      )
  
imports: from pyflink.common.serialization import SimpleStringSchema
  from pyflink.testing.test_case_utils import PyFlinkTestCase
label_desc: Use image node_id 1 for calling the SimpleStringSchemaTests obj's underlying member method code with example usage: obj.test_simple_string_schema() without return types