new_contents: from django.test import TestCase
  from django.contrib.auth.models import User
  
  from datastore import models, services
  
  class ExportServiceTestCase(TestCase):
  
      def setUp(self):
          user = User.objects.create_user('john', 'lennon@thebeatles.com', 'johnpassword')
          project = models.Project.objects.create(
              project_owner=user.projectowner,
              project_id="PROJECTID_6",
          )
          consumptionmetadata = models.ConsumptionMetadata.objects.create(
              project=project,
              fuel_type="E",
              energy_unit="KWH",
          )
          self.meterrun = models.MeterRun.objects.create(
              project=project,
              consumption_metadata=consumptionmetadata,
          )
  
      def test_export(self):
          data = services.meterruns_export()
          assert 'headers' in data
          assert 'meter_runs' in data
          assert len(data['meter_runs']) == 1
  
subject: Add test of export service