text: import json
  import unittest
  
  from databuilder.models.dashboard_elasticsearch_document import DashboardESDocument
  
  
  class TestDashboardElasticsearchDocument(unittest.TestCase):
  
      def test_to_json(self):
          # type: () -> None
          """
          Test string generated from to_json method
          """
          test_obj = DashboardESDocument(group_name='test_dashboard_group',
                                         name='test_dashboard_name',
                                         description='test_description',
                                         product='mode',
                                         cluster='gold',
                                         group_description='work space group',
                                         query_names=['query1'],
                                         group_url='mode_group_url',
                                         url='mode_report_url',
                                         uri='mode_dashboard://gold.cluster/dashboard_group/dashboard',
                                         last_successful_run_timestamp=10,
                                         total_usage=10,
                                         tags=['test'])
  
          expected_document_dict = {"group_name": "test_dashboard_group",
                                    "name": "test_dashboard_name",
                                    "description": "test_description",
                                    "product": "mode",
                                    "cluster": "gold",
                                    "group_url": "mode_group_url",
                                    "url": "mode_report_url",
                                    "uri": "mode_dashboard://gold.cluster/dashboard_group/dashboard",
                                    "query_names": ['query1'],
                                    "last_successful_run_timestamp": 10,
                                    "group_description": "work space group",
                                    "total_usage": 10,
                                    "tags": ["test"]
                                    }
  
          result = test_obj.to_json()
          results = result.split("\n")
  
          # verify two new line characters in result
          self.assertEqual(len(results), 2, "Result from to_json() function doesn't have a newline!")
          self.assertDictEqual(json.loads(results[0]), expected_document_dict)
  