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Win at life with unit testing
- 1. Win at Life with Unit Testing. by Mark Story
- 2. Who is thisgoofball Art college graduate that needed to make money. CakePHP core contributor for 2.5 years. Developer of DebugKit, ApiGenerator and several other plugins. Lead front end developer at FreshBooks
- 3. Can unit testing make me awesome?
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- 5. Why write tests? Helpsensure things that did work, still do. Helps reduce time it takes to fix new defects. Helps you plan a design, showing you where it might be complicated or overly coupled. Living documentation.
- 6. ... Catch issues earlier. Increaseddeveloper confidence. Automated killer robots.
- 7. What to test? Codethat keeps you up at night. Code that involves real money. Code that has broken before. Code that is tedious to test manually.
- 8. Different flava’s Unit tests Functionalor Integration tests
- 9. Unit Tests Testing thesmallest parts of your application in isolation. Often testing single methods or single functions. Generally uses many mocks. Really useful when doing Test driven development.
- 10. Functional Tests Tests piecesworking well together. Test top level objects to ensure all their guts are working together. Tests hitting database fixtures are often functional tests. Functional tests run slower, but use more active code.
- 11. Challenges of testing Time. It takes time to write tests. But it takes more time to fix the same bugs later multiple times. Only shows the presence of issues, not the absence. Only catches errors you have tests for.
- 12. Benefits of testing Findproblems earlier. Can be automated, robots are helpful. Less manual testing. Easier to ensure requirements are met. Unicorns.
- 13. The End. Of thepart where I extol the winsauce tests can bring.
- 14. Mock objects <insert>A funnyjoke</insert>
- 15. Mocks and test doubles Writing isolated tests is hard. Mock objects make it easier. Mocks help ensure your objects are touching other objects in the right places. Mocks help you stub out behaviour before you write the real deal.
- 16. Can I usea mock for: Global functions? Stuff not in functions?
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- 18. When to usemocks When talking to the outside world. Email. Webservices (Twitter, Paypal, YouTube). Writing files to disk. Writing to the database.
- 19. ... When you wantto ensure two objects are working together properly. When you do want to isolate problems.
- 20. Mocking your code Makesure dependencies can be replaced at runtime. Constructor injection. Factory methods. Setter methods.
- 21. Constructor Injection Acceptobjects your object depends on in the constructor. Jam mocks in when testing.
- 22. Factory Factory Factory Factory methods can be overridden in subclasses to return mocks.
- 23. Setter method Allows postconstruction modification of internal dependencies.
- 24. Mocks in thehouse Mocks can be critical of a test subject. Mocks and stub out dangerous components, or methods.
- 25. Critical mocking Critic mockscheck that other objects touch them correctly.
- 26. Stub danger. You canstub methods that send headers or touch the outside world.
- 27. Stub expensive stuff. Mocks can be used to stub network resources or expensive to fetch results.
- 28. In conclusion Mocks helpmake tests run faster, and require less setup & teardown. They allow you to write true unit tests.
- 29. The End. (of thepart where I blabber about mocks)
- 30. Automated Killer Robots test automation for squishy humans.
- 31. Automated testing. Tests thatare never run, are as good as deleted. Build servers to the rescue!
- 32. Hudson Hudson is acontinuous integration server built in Java. Has a great plugin community. Can send emails, Jabber and give pithy Chuck Norris quotes.
- 33. ... Can be configuredto run on a schedule or post commit. Integrates well with SVN and there is a GIT plugin too.
- 34. Typical Hudson setup Run tests on each commit/push. Run all tests again each night, incase there was a slow day. Nightly builds are also a good time to run code coverage builds.
- 35. Setting Hudson up Goto http://hudson-ci.org wget http://hudson-ci.org/latest/hudson.war java -jar hudson.war
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- 41. The End. For realthis time.
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