Python Testing Cookbook

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1. 书籍简介
   
2. This cookbook is written as a collection of code recipes containing
   
3. step-by-step directions on how to install or build different types of
   
4. Python test tools to solve different problems. Each recipe contains
   
5. explanations of how it works along with answers to common questions and
   
6. cross references to other relevant recipes. The easy-to-understand
   
7. recipe names make this a handy test reference book. Python developers
   
8. and programmers with a basic understanding of Python and Python testing
   
9. will find this cookbook beneficial. It will build on that basic
   
10. knowledge equipping you with the intermediate and advanced skills
    
11. required to fully utilize the Python testing tools. Broken up into lots
    
12. of small code recipes, you can read this book at your own pace, whatever
    
13. your experience. No prior experience of automated testing is required.

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关键词：Cookbook TESTING python Cook Book 电子书

1. Getting nosy with testing
   
2. 
   
3. Nose automatically discovers tests when fed with a package, a module, or a file.
   
4. 
   
5. How to do it...
   
6. With the following steps, we will explore how nose automatically finds test cases and runs them:
   
7. 
   
8. Create a new file called recipe11.py in which to put all our code for this recipe.
   
9. Create a class to test. For this recipe, we will use a shopping cart application that lets us load items and then calculate the bill.
   
10. class ShoppingCart(object):
    
11.     def __init__(self):
    
12.         self.items = []
    
13. 
    
14.     def add(self, item, price):
    
15.         self.items.append(Item(item, price))
    
16.         return self
    
17. 
    
18.     def item(self, index):
    
19.         return self.items[index-1].item
    
20. 
    
21.     def price(self, index):
    
22.         return self.items[index-1].price
    
23. 
    
24.     def total(self, sales_tax):
    
25.         sum_price = sum([item.price for item in self.items])
    
26.         return sum_price*(1.0 + sales_tax/100.0)
    
27. 
    
28.     def __len__(self):
    
29.         return len(self.items)
    
30. 
    
31. class Item(object):
    
32.     def __init__(self, item, price):
    
33.         self.item = item
    
34.         self.price = price
    
35. Create a test case that exercises the various parts of the shopping cart application.
    
36. import unittest
    
37. 
    
38. class ShoppingCartTest(unittest.TestCase):
    
39.     def setUp(self):
    
40.         self.cart = ShoppingCart().add("tuna sandwich", 15.00)
    
41. 
    
42.     def test_length(self):
    
43.         self.assertEquals(1, len(self.cart))
    
44. 
    
45.     def test_item(self):
    
46.         self.assertEquals("tuna sandwich", self.cart.item(1))
    
47. 
    
48.     def test_price(self):
    
49.         self.assertEquals(15.00, self.cart.price(1))
    
50. 
    
51.     def test_total_with_sales_tax(self):
    
52.         self.assertAlmostEquals(16.39, \
    
53.                                 self.cart.total(9.25), 2)
    
54. Use the command-line nosetests tool to run this recipe by filename and also by module.

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