SlideShare a Scribd company logo
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
Mockfight! FlexMock vs. Mocha                                                      25




Questions?




                                                            ? ?    ?
Viget Labs
we build web business



July 18, 2007                   © Copyright 2007 Viget Labs, LLC – www.viget.com
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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Mockfight! FlexMock vs. Mocha

  • 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. Mockfight! FlexMock vs. Mocha 25 Questions? ? ? ? Viget Labs we build web business July 18, 2007 © Copyright 2007 Viget Labs, LLC – www.viget.com
  • 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