[mocha-developer] using mocha with rspec

Dan North dan at tastapod.com
Tue Mar 13 07:25:50 EDT 2007

Yes you're right - it doesn't automagically verify, but the verify_mocks 
method is in scope and I like to have that explicitly in my spec methods 

The big things on my wishlist are:

1. Matchers in with(..) like JMock has: 
expects(:chew).with(is_a(Chewable), ANYTHING) where is_a(..) is a 
[something] that responds to matches?(actual) with true/false, and 
ANYTHING is a matcher that always returns true. That way, you could use 
rspec's expectation matcher framework or roll your own matchers. (I've 
got a bunch I wrote for my own mocking framework - everyone should write 
a mocking framework at least twice once :)

The method matches?(actual) seems fairly universal across these frameworks.

2. Type-aware mocks that fail with a NoMethodError if the underlying 
type doesn't respond to an invoked method or method_missing (see earlier 

3. Something akin to after(another_mock, :method).

None of these are showstoppers, but 1 is really high on my priorities 
and 2 and 3 would make my life happier. I might try to roll something 
for 1 if I get the time (read: unlikely!).


James Mead wrote:
> On 12/03/07, Dan North <dan at tastapod.com> wrote:
>> I've just started using rspec and I have to say it's very nice. The
>> thing is, I prefer mocha's mocking dialect. So I thought a simple
>> require 'mocha' would set me up.
>> Unfortunately, rspec does all its goodness using do/end blocks in
>> anonymous classes, so it wasn't quite that obvious.
>> Anyway, here is the incantation I ended up using in my equivalent of a
>> test_helper.rb file that I include in all my spec files:
>> # replace rspec's mocks with mocha
>> require 'mocha'
>> module Spec
>>   module Mocks
>>     remove_method :mock
>>     remove_method :stub
>>     remove_method :verify_mocks if method_defined? :verify_mocks
>>     include Mocha::AutoVerify
>>   end
>> end
>> Now I have working mock(), stub() and verify_mocks(). Not sure what
>> other Mocha stuff I'm missing yet, but I'll let you know how I get on.
>> I noticed that Mocha::Standalone also references
>> Mocha::SetupAndTeardown, but I didn't see anything in there that seemed
>> relevant to rspec mocking.
> Hi Dan,
> I'm glad you like Mocha's mocking dialect. It's great you've got Mocha
> working with RSpec.
> Mocha::Standalone was an early attempt at simplifying integration with other
> testing frameworks prompted by a request from the RSpec community. Work on
> this ground to a halt when RSpec developed their own mocking functionality.
> Mocha::SetupAndTeardown is to do with what RSpec call partial mocks i.e.
> where you are mocking a method on a concrete class or object. Looking at
> what you've done, I suspect you will still be able to setup expectations
> like this but (a) they won't be verified and (b) the concrete class or
> object won't be returned to its original state (Mocha temporarily messes
> with the method implementation).
> Let us know if there are any changes we can make that would make the
> integration easier.

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