new_contents: from django.test import TestCase
  from django.http import HttpRequest
  
  from core.context_processors import navbar
  from board.models import Board
  
  
  class TestNavbarContextProcessor(TestCase):
      def test_return_board_list_correctly(self):
          test_board = Board.objects.create(
              slug='slug',
              name='board'
          )
          request = HttpRequest()
  
          response = navbar(request)
          boards = response['boards']
          self.assertEqual(boards[0].slug, test_board.slug)
          self.assertEqual(boards[0].name, test_board.name)
  
subject: Add unit test of navbar context processor