new_contents: from workshops.models import Tag
  from workshops.tests.base import TestBase
  
  
  class TestTagManager(TestBase):
      def setUp(self):
          super()._setUpTags()
  
      def test_main_tags(self):
          # Arrange
          expected = [
              Tag.objects.get(name="DC"),
              Tag.objects.get(name="ITT"),
              Tag.objects.get(name="LC"),
              Tag.objects.get(name="SWC"),
              Tag.objects.get(name="TTT"),
              Tag.objects.get(name="WiSE"),
          ]
          # Act
          tags = Tag.objects.main_tags().order_by("name")
          # Assert
          self.assertEqual(list(tags), expected)
  
      def test_carpentries_tags(self):
          # Arrange
          expected = [
              Tag.objects.get(name="DC"),
              Tag.objects.get(name="LC"),
              Tag.objects.get(name="SWC"),
          ]
          # Act
          tags = Tag.objects.carpentries().order_by("name")
          # Assert
          self.assertEqual(list(tags), expected)
  
      def test_strings(self):
          # Arrange
          expected = ["DC", "LC", "SWC"]
          # Act
          tags = Tag.objects.carpentries().order_by("name").strings()
          # Assert
          self.assertEqual(list(tags), expected)
  
subject: Add tests for Tag manager