text: import pytest
  
  from db.models.project_type import ProjectType
  
  
  @pytest.mark.django_db
  def test_create_project_isinstance(project_type_valid_args):
      project_type = ProjectType.objects.create(**project_type_valid_args)
  
      assert isinstance(project_type, ProjectType)
  
  
  @pytest.mark.django_db
  def test_get_project_isinstance(project_type_valid_args):
      project_type = ProjectType.objects.create(**project_type_valid_args)
      project_type = ProjectType.objects.get(id=project_type.id)
  
      assert isinstance(project_type, ProjectType)
      assert isinstance(project_type.name, str)
  
      assert project_type.name == project_type_valid_args.get('name')
  
  
  @pytest.mark.django_db
  def test_update_project_isinstance(project_type_valid_args):
      new_name = 'rich'
      project_type = ProjectType.objects.create(**project_type_valid_args)
      ProjectType.objects.filter(id=project_type.id).update(name=new_name)
      project_type.refresh_from_db()
  
      assert isinstance(project_type, ProjectType)
      assert isinstance(project_type.name, str)
  
      assert project_type.name == new_name
  
  
  @pytest.mark.django_db
  def test_delete_project_isinstance(project_type_valid_args):
      project_type = ProjectType.objects.create(**project_type_valid_args)
      number_of_deletions, _ = project_type.delete()
  
      assert number_of_deletions == 1
  