'Test the unitize method of a Transaction'

def test_unitize(self):

    self.assertEqual(Transaction.unitize(1, 1), 1)
    self.assertEqual(Transaction.unitize(0.03, 0.02), 0.04)
    self.assertEqual(Transaction.unitize(50, 0.05), 50)
    self.assertEqual(Transaction.unitize(50.1818, 25), 75)
