class_docstr: Testing export import functionality for dashboards
class_docstr_tok: ["Testing","export","import","functionality","for","dashboards"]
code: def setUpClass(cls):
      cls.delete_imports()
  
imports: import json
  import unittest
  from uuid import uuid4
  import yaml
  from tests.integration_tests.test_app import app
  from superset import db
  from superset.connectors.sqla.models import SqlaTable, SqlMetric, TableColumn
  from superset.utils.database import get_example_database
  from superset.utils.dict_import_export import export_to_dict
  from .base_tests import SupersetTestCase
label_desc: Use image node_id 2 for calling the TestDictImportExport obj's underlying member method code with example usage: obj.setUpClass(cls) without return types