coding-mentor-agent/kb/python-course-kb-practical-python/wiki/exercises/8-1-writing-unit-tests.md

id, source_exercise_id, title, section, source_path, source_repo, source_commit, student_visible_solution, has_private_solution, skip

id	source_exercise_id	title	section	source_path	source_repo	source_commit	student_visible_solution	has_private_solution	skip
practical-python-8.1	8.1	Writing Unit Tests	8.1 Testing	08_Testing_debugging/01_Testing.md	https://github.com/dabeaz-course/practical-python	93dca856b41c61a0a0f85ae334116e4c125629ea	false	true	false

Exercise 8.1: Writing Unit Tests

Source: Practical Python Programming, 08_Testing_debugging/01_Testing.md.

Exercise 8.1: Writing Unit Tests

In a separate file test_stock.py, write a set a unit tests for the Stock class. To get you started, here is a small fragment of code that tests instance creation:

# test_stock.py

import unittest
import stock

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)

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

Run your unit tests. You should get some output that looks like this:

.
----------------------------------------------------------------------
Ran 1 tests in 0.000s

OK

Once you're satisfied that it works, write additional unit tests that check for the following:

• Make sure the s.cost property returns the correct value (49010.0)
• Make sure the s.sell() method works correctly. It should decrement the value of s.shares accordingly.
• Make sure that the s.shares attribute can't be set to a non-integer value.

For the last part, you're going to need to check that an exception is raised. An easy way to do that is with code like this:

class TestStock(unittest.TestCase):
    ...
    def test_bad_shares(self):
         s = stock.Stock('GOOG', 100, 490.1)
         with self.assertRaises(TypeError):
             s.shares = '100'

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关联来源

• summaries/01_Testing