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Blogs
  Google London Automation Test conference - 8th of September 2006

I'm writing this from Googles office in London, UK where Google is hosting a conference on Automated Testing. Testing of software that is. There's been very little talking about usability testing or hardware testing. There's been a lot of talks about taking unittesting taken to the next level.
  String comparison function in Python (alpha) - 22nd of December 2007

I was working on a unittest which when it failed would say "this string != that string" and because some of these strings were very long (output of a HTML lib I wrote which spits out snippets of HTML code) it became hard to spot how they were different. So I decided to override the usual self.assertEqual(str1, str2) in Python's unittest class instance with this little baby:

 def assertEqualLongString(a, b):
    NOT, POINT = '-', '*'
    if a != b:
        print a
        o = ''
        for i, e in enumerate(a):
            try:
                if e != b[i]:
                    o += POINT
                else:
                    o += NOT
            except IndexError:
                o += '*'

        o += NOT * (len(a)-len(o))
        if len(b) > len(a):
            o += POINT* (len(b)-len(a))

        print o
        print b

        raise AssertionError, '(see string comparison above)'
  Mocking os.stat in Python - 8th of November 2009

I have some code that checks that a file is treated differently if some time has passed. In other words, it reacts if the modification time is more than it was before. The code uses os.stat(filename)[stat.ST_MTIME] to do this. The challenge was to mock os.stat so that I can pretend some time has passed without having to wait. Here was my first solution which made running many tests sloooow:

 def test_file_changed(self):
     filename = 'foo.txt'
     expect_timestamp = int(time.time())
     ...run the unit test with 'expect_timestamp'...
     time.sleep(1)
     expect_timestamp += 1
     ...run the unit test with 'expect_timestamp'...
  To assert or assertEqual in Python unit testing - 14th of February 2009

When you write unit tests in Python you can use these widgets:

 self.assertEqual(var1, var2, msg=None)
 self.assertNotEqual(var1, var2, msg=None)
 self.assertTrue(expr, msg=None)
 self.assertRaises(exception, func, para, meters, ...)