def METHOD_NAME(self):
    # Arrange
    test_project = Project()
    test_project.tasks_mapped = 1
    test_project.tasks_validated = 0
    test_user = User()
    test_user.tasks_validated = 0
    # Act
    test_project, test_user = StatsService._update_tasks_stats(
        test_project, test_user, TaskStatus.MAPPED, TaskStatus.VALIDATED
    )
    # Assert
    self.assertEqual(test_project.tasks_mapped, 0)
    self.assertEqual(test_project.tasks_validated, 1)
    self.assertEqual(test_user.tasks_validated, 1)