Unit testing.. why wouldn't you?

Unit testing is a good thing, right? Especially if it is simple to set up, simple to run and simple to read the results. How do we do it in Python? Simple!
Here's a quick example using some pieces from the unit test file I checked in along with the python bitset:

import unittest
from pybitset import Bitset # import class or module under test

class bitset_testcase(unittest.TestCase):
   def setUp(self): # testcase setup
       self.bits = Bitset(10)
      
   def testSize(self): # some method to test
                       # use assert to compare the expected and 
                       # actual results
       assert len(self.bits.bitstring)==self.bits.size(), 
           'Incorrect Size'
  
   def testRepr(self): # some other method
       assert self.bits.size() == len(self.bits.__repr__()), 
           'Repr size incorrect'
      

# .. if you need to test exceptions then write some code to 
# provoke an exception and catch the exception and add an else 
# clause to deal with exception failure
          
   def testIndex(self):
       try:
           self.bits[40]=1
       except IndexError:
           pass
       else:
           self.fail("Out of range index expected exception")

# add the check for main so you can run from the command line
if __name__ == "__main__":
   unittest.main()

Presto! Try it out, it's easy.

If you don't like my notes, go and read this