Developers considered harmful

by Lowe Thiderman

harmful.ninjaloot.se

Show of hands

Who here is 100% sure that their code works perfectly?

Shouldn't we be sure?

Too many people do not test their code

And why is this a problem?

It's because you suck

(...bitch)

• Errors are everywhere
• SyntaxError, TypeError, NetworkError, CodeError, and semantic errors

Testing is a very effective way to avoid errors!

The excuses

• It takes too much time
• There is too much untested code already
  • Test all new code
  • Write tests when you fix things
• We test it manually
• I wrote it; I know that it works

Why I think people don't test

• It's insulting
• Test sites and test examples suck ass

  self.assertEqual(1 + 1, 2)

• It's really scary

Unit testing

• Really quick
• Small piece of code as possible

class StringFilter(object):
    def cummings_filter(self, string):
        return string.lower()

class StringFilterTests(unittest.TestType):
    def test_cummings_filter(self):
        sf = StringFilter()
        result = sf.cummings_filter('TeSt StrInG heHE')

        self.assertEqual(result, 'test string hehe')

Integration testing

• Tests the bigger picture
• Assume a website : /register/
• Proper registration
  • keNtPhlikkAh_1988
  • hunter2
  • rebecca_black_r00ls@aol.com
• Improper registration
  • admin
  • a
  • b@d@email.!

Why I think people should test

• You get proof that your code works
• You get confidence in your code
• You will write better code

If only one thing

Reconsider testing

Thank you