[rspec-users] Why does this stub doesn't work?

David Chelimsky dchelimsky at gmail.com
Mon Oct 25 05:23:25 EDT 2010


On Oct 25, 2010, at 3:20 AM, Haim Ashkenazi wrote:

> Hi Zach,
> 
> On Oct 24, 2010, at 11:04 PM, Zach Dennis wrote:
> 
>> 
>> 
>> On Sun, Oct 24, 2010 at 11:21 AM, Haim Ashkenazi <haim.ashkenazi at gmail.com> wrote:
>> Hi
>> 
>> I wonder why this stub doesn't work:
>> 
>> # ruby 1.8.7, rspec 2.0.1
>> require 'rubygems'
>> require 'rspec'
>> 
>> Rspec.configure do |c|
>> 
>>   c.mock_with :rspec
>> end
>> 
>> class SayHello
>>   def say_hello
>>     "hello"
>>   end
>> end
>> 
>> describe "test string" do
>>   it "should interpret stub correctly" do
>>     SayHello.stub!(:say_hello).and_return('NO')
>> 
>>     sh = SayHello.new()
>>     sh.say_hello.should eql('NO')
>>   end
>> end
>> In your example you are stubbing a class method. In your implementation you have defined an instance method. To have this work for your given implementation you need to know about the instance you are working with, ie:
>> 
>> it "should interpret stub correctly" do
>>     sh = SayHello.new()
>>     sh.stub!(:say_hello).and_return 'NO'
>>     sh.say_hello.should eql('NO')
>>  end
>> 
>> Hope this helps,
> 
> Thanks for your help. I've found in the archives that you have to use mocha to do these kind of things.

This is incorrect. You are free to use mocha, but rspec-mocks, RR, and flexmock are all perfectly capable of stubbing class methods, so you don't _have_ to use mocha.

> I tried a different approach (to mock the initializer) but although this works on a simple setup, it didn't work for me on my real classes.

What Zach suggested is the correct approach. What problem are you seeing when you try it?

> I'm probably doing something wrong so I'll upload it to github and ask this list again for help.
> 
> Thanks.
> 
> Bye
> 
>> 
>> Zach
>>  
>> 
>> 
>> The result is:
>> tryouts ➤ rspec -f n test_spec.rb                                              
>> 
>> test string
>>   should interpret stub correctly (FAILED - 1)
>> 
>> Failures:
>>   1) test string should interpret stub correctly
>>      Failure/Error: sh.say_hello.should eql('NO')
>>      
>>      expected "NO"
>>           got "hello"
>>      
>>      (compared using eql?)
>>      # ./test_spec.rb:18
>> 
>> Finished in 0.0016 seconds
>> 1 example, 1 failure
>> Any ideas?
>> Bye
>> Haim Ashkenazi
>> 
>> 
>> 
>> _______________________________________________
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>> 
>> 
>> 
>> -- 
>> Zach Dennis
>> http://www.continuousthinking.com (personal)
>> http://www.mutuallyhuman.com (hire me)
>> http://ideafoundry.info/behavior-driven-development (first rate BDD training)
>> @zachdennis (twitter)
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> 
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