text: from django.test import TestCase
  
  from .calc import add, subtract
  
  
  class CaclTest(TestCase):
      def test_add_numbers(self):
          """
          Test two number are added together
          :return:
          """
          self.assertEqual(add(3, 4), 7)
  
      def test_subtract_numbers(self):
          """
          Test subtract two numbers
          :return:
          """
          self.assertEqual(subtract(3, 10), 7)
  