code: def test_load(self):
      self.assertRaises(
          AssertionError, NERCnSample, {"x": "上海浦东开发与法制建设同步"}
      )
      self.assertRaises(
          AssertionError, NERCnSample, {"y": "上海浦东开发与法制建设同步"}
      )
      self.assertRaises(AssertionError, NERCnSample, {"x": ""})
      self.assertRaises(
          AssertionError,
          NERCnSample,
          {
              "x": [
                  "上",
                  "海",
                  "浦",
                  "东",
                  "开",
                  "发",
                  "与",
                  "法",
                  "制",
                  "建",
                  "设",
                  "同",
                  "步",
              ],
              "y": [
                  "E-GPE",
                  "E-GPE",
                  "B-GPE",
                  "E-GPE",
                  "O",
                  "O",
                  "O",
                  "O",
                  "O",
                  "O",
                  "O",
                  "O",
                  "O",
              ],
          },
      )
      self.assertRaises(
          AssertionError,
          NERCnSample,
          {
              "x": [
                  "上",
                  "海",
                  "浦",
                  "东",
                  "开",
                  "发",
                  "与",
                  "法",
                  "制",
                  "建",
                  "设",
                  "同",
                  "步",
              ],
              "y": [
                  "B-GPE",
                  "E-GPE",
                  "B-GPE",
                  "E-GPE",
                  "O",
                  "O",
                  "O",
                  "O",
                  "O",
                  "O",
                  "O",
                  "O",
              ],
          },
      )
  
imports: import unittest
  from textflint.input.component.sample.nercn_sample import *
label_desc: Use image node_id 1 for calling the TestNERCnSample obj's underlying member method code with example usage: obj.test_load() without return types