code: def test_dump(self):
      self.assertEqual(
          {
              "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",
                  "O",
              ],
              "sample_id": None,
          },
          cnner_sample.dump(),
      )
  
imports: import unittest
  from textflint.input.component.sample.nercn_sample import *
label_desc: Use image node_id 2 for calling the TestNERCnSample obj's underlying member method code with example usage: obj.test_dump() without return types