Mockfight! FlexMock vs. Mocha

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Patrick compares 2 popular mocking libraries based on the features they provide and the API that each exposes to developers.

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Mockfight! FlexMock vs. Mocha

  1. 1. Mockfight! FlexMock vs. Mocha Patrick Reagan patrick@viget.com Director, Application Development Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com
  2. 2. Mockfight! FlexMock vs. Mocha 2 What are Mocks? “Mock objects are simulated objects that mimic the behavior of real objects in controlled ways” - Wikipedia Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com
  3. 3. Mockfight! FlexMock vs. Mocha 3 When to Mock? Use mocks when you want to: • Control the behavior of internal method calls • Remove dependence on external systems • Improve test performance Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com
  4. 4. Mockfight! FlexMock vs. Mocha 4 Control Behavior What does this return? Need to maintain consistency between calls Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com
  5. 5. Mockfight! FlexMock vs. Mocha 5 Control Behavior How do we test? Magic happens here Stub the call to Die#rand (using Mocha) Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com
  6. 6. Mockfight! FlexMock vs. Mocha 6 Remove Dependencies Example: retrieve response data via HTTP To test this, we need to mock: • Call to URI#parse • Calls to Net::HTTP#new and Net::HTTP#head Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com
  7. 7. Mockfight! FlexMock vs. Mocha 7 Mockfight! Expanded example: • Create class method to check for resource • Handle errors and redirects • Iteratively develop functionality while testing • Examine the differences between libraries Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com
  8. 8. Mockfight! FlexMock vs. Mocha 8 Round 1 Test scenario when URI#parse raises exception Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com
  9. 9. Mockfight! FlexMock vs. Mocha 9 Round 1: Results FlexMock Mocha Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com
  10. 10. Mockfight! FlexMock vs. Mocha 10 Round 2 Check for a valid response Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com
  11. 11. Mockfight! FlexMock vs. Mocha 11 Round 2: Results FlexMock Mocha Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com
  12. 12. Mockfight! FlexMock vs. Mocha 12 Round 3 Check for response type instead of status code * Our previous tests for response status code are now invalid Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com
  13. 13. Mockfight! FlexMock vs. Mocha 13 Round 3: Results FlexMock Mocha Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com
  14. 14. Mockfight! FlexMock vs. Mocha 14 Round 4 Follow an HTTP redirect response Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com
  15. 15. Mockfight! FlexMock vs. Mocha 15 Round 4: Results FlexMock Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com
  16. 16. Mockfight! FlexMock vs. Mocha 16 Round 4: Results Mocha Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com
  17. 17. Mockfight! FlexMock vs. Mocha 17 Round 5 Handling maximum number of redirects Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com
  18. 18. Mockfight! FlexMock vs. Mocha 18 Round 5: Results FlexMock Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com
  19. 19. Mockfight! FlexMock vs. Mocha 19 Round 5: Results Mocha Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com
  20. 20. Mockfight! FlexMock vs. Mocha 20 Bonus Round Mocking ActiveRecord#find in controllers Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com
  21. 21. Mockfight! FlexMock vs. Mocha 21 Bonus Round: Results FlexMock Mocha Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com
  22. 22. Mockfight! FlexMock vs. Mocha 22 But Wait, There’s More Mocha has parameter matchers (in SVN) You can write code like this: Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com
  23. 23. Mockfight! FlexMock vs. Mocha 23 Conclusion • Newest versions of gems contain similar features • FlexMock can accept blocks for further mocking • Personal preference of syntax is the deciding factor Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com
  24. 24. Mockfight! FlexMock vs. Mocha 24 It’s a Tie! Ultimately, two great libraries - just pick one Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com
  25. 25. Mockfight! FlexMock vs. Mocha 25 Questions? ? ? ? Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com
  26. 26. Mockfight! FlexMock vs. Mocha 26 Additional Information FlexMock (Jim Weirich) http://www.onestepback.org/software/flexmock Mocha (James Mead) http://mocha.rubyforge.org http://www.slideshare.net/viget Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com

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