Mockfight! FlexMock vs. Mocha

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Mockfight!FlexMock vs. MochaPatrick Reaganpatrick@viget.comDirector, Application Development

“Mock objects are simulated objects that mimic the behavior of real objects in controlled ways”

- Wikipedia

What are Mocks?

“Mock objects are simulated objects that mimic the behavior of real objects in controlled ways”

- Wikipedia

When to Mock?

• Control the behavior of internal method calls

• Remove dependence on external systems

• Improve test performance

Use mocks when you want to:

Control Behavior

What does this return?

Need to maintain consistency between calls

Control Behavior

How do we test?

Stub the call to Die#rand (using Mocha)

Magic happens here

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

Mockfight!

Expanded example:

• Create class method to check for resource

• Handle errors and redirects

• Iteratively develop functionality while testing

• Examine the differences between libraries

Round 1

Test scenario when URI#parse raises exception

Round 1: Results

FlexMock

Round 2

Check for a valid response

Round 2: Results

FlexMock

Round 3

Check for response type instead of status code

* Our previous tests for response status code are now invalid

Round 3: Results

FlexMock

Round 4

Follow an HTTP redirect response

Round 4: Results

FlexMock

Round 4: Results

Round 5

Handling maximum number of redirects

Round 5: Results

FlexMock

Round 5: Results

Bonus Round

Mocking ActiveRecord#find in controllers

Bonus Round: Results

FlexMock

But Wait, There’s More

Mocha has parameter matchers (in SVN)You can write code like this:

Conclusion

• Newest versions of gems contain similar features

• FlexMock can accept blocks for further mocking

• Personal preference of syntax is the deciding factor

It’s a Tie!

Ultimately, two great libraries - just pick one

Questions?

Additional Information

FlexMock (Jim Weirich)http://www.onestepback.org/software/flexmock

Mocha (James Mead)http://mocha.rubyforge.org

http://www.slideshare.net/viget

Mockfight! FlexMock vs. Mocha

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