python-mastery/Exercises/soln5_6.md

Exercise 5.6 - Solution

(b) Unit testing

# teststock.py

import stock
import unittest

class TestStock(unittest.TestCase):
    def test_create(self):
        s = stock.Stock('GOOG', 100, 490.1)
        self.assertEqual(s.name, 'GOOG')
        self.assertEqual(s.shares, 100)
        self.assertEqual(s.price, 490.1)

    def test_create_keyword(self):
        s = stock.Stock(name='GOOG', shares=100, price=490.1)
        self.assertEqual(s.name, 'GOOG')
        self.assertEqual(s.shares, 100)
        self.assertEqual(s.price, 490.1)
        
    def test_cost(self):
        s = stock.Stock('GOOG', 100, 490.1)
        self.assertEqual(s.cost, 49010.0)

    def test_sell(self):
        s = stock.Stock('GOOG', 100, 490.1)
        s.sell(25)
        self.assertEqual(s.shares, 75)

    def test_from_row(self):
        s = stock.Stock.from_row(['GOOG','100','490.1'])
        self.assertEqual(s.name, 'GOOG')
        self.assertEqual(s.shares, 100)
        self.assertEqual(s.price, 490.1)

    def test_repr(self):
        s = stock.Stock('GOOG', 100, 490.1)
        self.assertEqual(repr(s), "Stock('GOOG', 100, 490.1)")

    def test_eq(self):
        a = stock.Stock('GOOG', 100, 490.1)
        b = stock.Stock('GOOG', 100, 490.1)
        self.assertTrue(a==b)

if __name__ == '__main__':
    unittest.main()

(c) Testing for Errors

# teststock.py

import stock
import unittest

class TestStock(unittest.TestCase):
    def test_create(self):
        s = stock.Stock('GOOG', 100, 490.1)
        self.assertEqual(s.name, 'GOOG')
        self.assertEqual(s.shares, 100)
        self.assertEqual(s.price, 490.1)

    def test_create_keyword(self):
        s = stock.Stock(name='GOOG', shares=100, price=490.1)
        self.assertEqual(s.name, 'GOOG')
        self.assertEqual(s.shares, 100)
        self.assertEqual(s.price, 490.1)
        
    def test_cost(self):
        s = stock.Stock('GOOG', 100, 490.1)
        self.assertEqual(s.cost, 49010.0)

    def test_sell(self):
        s = stock.Stock('GOOG', 100, 490.1)
        s.sell(25)
        self.assertEqual(s.shares, 75)

    def test_from_row(self):
        s = stock.Stock.from_row(['GOOG','100','490.1'])
        self.assertEqual(s.name, 'GOOG')
        self.assertEqual(s.shares, 100)
        self.assertEqual(s.price, 490.1)

    def test_repr(self):
        s = stock.Stock('GOOG', 100, 490.1)
        self.assertEqual(repr(s), "Stock('GOOG', 100, 490.1)")

    def test_eq(self):
        a = stock.Stock('GOOG', 100, 490.1)
        b = stock.Stock('GOOG', 100, 490.1)
        self.assertTrue(a==b)

    # Tests for failure conditions
    def test_shares_badtype(self):
        s = stock.Stock('GOOG', 100, 490.1)
        with self.assertRaises(TypeError):
            s.shares = '50'

    def test_shares_badvalue(self):
        s = stock.Stock('GOOG', 100, 490.1)
        with self.assertRaises(ValueError):
            s.shares = -50

    def test_price_badtype(self):
        s = stock.Stock('GOOG', 100, 490.1)
        with self.assertRaises(TypeError):
            s.price = '45.23'

    def test_price_badvalue(self):
        s = stock.Stock('GOOG', 100, 490.1)
        with self.assertRaises(ValueError):
            s.price = -45.23

    def test_bad_attribute(self):
        s = stock.Stock('GOOG', 100, 490.1)
        with self.assertRaises(AttributeError):
            s.share = 100

if __name__ == '__main__':
    unittest.main()

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