class CalculationTest(unittest.TestCase):

    def setUp(self):
        self.c = Calculation()

    def test_evaluate(self):
        self.c.test = 10
        self.assertEqual(self.c.test, 10)
        self.assertEqual(self.c.evaluate("17*3"), 51)

    def test_eval_bad_input(self):
        baddies = "\Af_:{'"
        for i in baddies:
            self.assertEqual(self.c.evaluate(i), None)
 def setUp(self):
     self.c = Calculation()