rspec users - Nov 2008 - Expected "with" matches received "with" in error message

I am trying to spec a controller that sets up a page to add two
instances of an object to another (many to many :through).

In my controller_spec, I have the following statements:

      Student.should_receive(:new).and_return(mock_student)
      mock_student.should_receive(:relatives).twice
     
mock_student.relatives.should_receive("<<").with(Relative.new(:parent
=> Parent.new)).twice

When I run the test, I get the following error message:

Spec::Mocks::MockExpectationError in ''StudentsController responding to
GET new should expose a new student as @student''
Mock ''NilClass'' expected :<< with (#<Relative id:
nil, parent_id: nil,
student_id: nil, created_at: nil, updated_at: nil, child_lives_with:
nil>) but received it with (#<Relative id: nil, parent_id: nil,
student_id: nil, created_at: nil, updated_at: nil, child_lives_with:
nil>)

It seems what it is receiving and expecting are the same.

Any ideas would be greatly appreciated.

Tom
-- 
Posted via http://www.ruby-forum.com/.

On Mon, Nov 3, 2008 at 9:23 AM, Tom Hoen <lists at ruby-forum.com>
wrote:
> I am trying to spec a controller that sets up a page to add two
> instances of an object to another (many to many :through).
>
> In my controller_spec, I have the following statements:
>
>      Student.should_receive(:new).and_return(mock_student)
>      mock_student.should_receive(:relatives).twice
>     
mock_student.relatives.should_receive("<<").with(Relative.new(:parent
> => Parent.new)).twice
>
> When I run the test, I get the following error message:
>
> Spec::Mocks::MockExpectationError in ''StudentsController
responding to
> GET new should expose a new student as @student''
> Mock ''NilClass'' expected :<< with (#<Relative
id: nil, parent_id: nil,
> student_id: nil, created_at: nil, updated_at: nil, child_lives_with:
> nil>) but received it with (#<Relative id: nil, parent_id: nil,
> student_id: nil, created_at: nil, updated_at: nil, child_lives_with:
> nil>)
>
> It seems what it is receiving and expecting are the same.
>
> Any ideas would be greatly appreciated.
ActiveRecord treats two unsaved records as unequal, even if they have
the same properties. Try this in script/console

Relative.new == Relative.new
=> false

To get this to work you''ll have to either use real records (with IDs)
or stub whatever it is that is supplying the Relative and then expect
with(the_relative_you_supply_as_a_stub_value).

Make sense?
>
> Tom
> --
> Posted via http://www.ruby-forum.com/.
> _______________________________________________
> rspec-users mailing list
> rspec-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/rspec-users
>

"David Chelimsky" <dchelimsky at gmail.com> writes:
> On Mon, Nov 3, 2008 at 9:23 AM, Tom Hoen <lists at ruby-forum.com>
wrote:
>> I am trying to spec a controller that sets up a page to add two
>> instances of an object to another (many to many :through).
>>
>> In my controller_spec, I have the following statements:
>>
>>      Student.should_receive(:new).and_return(mock_student)
>>      mock_student.should_receive(:relatives).twice
>>     
mock_student.relatives.should_receive("<<").with(Relative.new(:parent
>> => Parent.new)).twice
>>
>> When I run the test, I get the following error message:
>>
>> Spec::Mocks::MockExpectationError in ''StudentsController
responding to
>> GET new should expose a new student as @student''
>> Mock ''NilClass'' expected :<< with
(#<Relative id: nil, parent_id: nil,
>> student_id: nil, created_at: nil, updated_at: nil, child_lives_with:
>> nil>) but received it with (#<Relative id: nil, parent_id: nil,
>> student_id: nil, created_at: nil, updated_at: nil, child_lives_with:
>> nil>)
>>
>> It seems what it is receiving and expecting are the same.
>>
>> Any ideas would be greatly appreciated.
>
> ActiveRecord treats two unsaved records as unequal, even if they have
> the same properties. Try this in script/console
>
> Relative.new == Relative.new
> => false
>
> To get this to work you''ll have to either use real records (with
IDs)
> or stub whatever it is that is supplying the Relative and then expect
> with(the_relative_you_supply_as_a_stub_value).
>
> Make sense?
Also I''d like to bring attention to "Mock
''NilClass'' expected :<<".
mock_student.relatives is nil, but you''ll want to return something.  As
for the actual problem, what David said :)

Pat

> 
> To get this to work you''ll have to either use real records (with
IDs)
> or stub whatever it is that is supplying the Relative and then expect
> with(the_relative_you_supply_as_a_stub_value).
> 
> Make sense?
In part, but not 100%. Here is the code from the controller. Since all 
objects are expected to be new, I am not clear whether using real 
objects would create a false test. I am quite new to rspec, and 
admittedly don''t fully grasp when to mock and when to not.

    @student = Student.new
    2.times { @student.relatives << Relative.new(:parent => Parent.new)
}
-- 
Posted via http://www.ruby-forum.com/.

On Mon, Nov 3, 2008 at 9:30 AM, David Chelimsky <dchelimsky at gmail.com>
wrote:
> On Mon, Nov 3, 2008 at 9:23 AM, Tom Hoen <lists at ruby-forum.com>
wrote:
>> I am trying to spec a controller that sets up a page to add two
>> instances of an object to another (many to many :through).
>>
>> In my controller_spec, I have the following statements:
>>
>>      Student.should_receive(:new).and_return(mock_student)
>>      mock_student.should_receive(:relatives).twice
>>     
mock_student.relatives.should_receive("<<").with(Relative.new(:parent
>> => Parent.new)).twice
>>
>> When I run the test, I get the following error message:
>>
>> Spec::Mocks::MockExpectationError in ''StudentsController
responding to
>> GET new should expose a new student as @student''
>> Mock ''NilClass'' expected :<< with
(#<Relative id: nil, parent_id: nil,
>> student_id: nil, created_at: nil, updated_at: nil, child_lives_with:
>> nil>) but received it with (#<Relative id: nil, parent_id: nil,
>> student_id: nil, created_at: nil, updated_at: nil, child_lives_with:
>> nil>)
>>
>> It seems what it is receiving and expecting are the same.
>>
>> Any ideas would be greatly appreciated.
>
> ActiveRecord treats two unsaved records as unequal, even if they have
> the same properties. Try this in script/console
>
> Relative.new == Relative.new
> => false
This fact has always bugged me, so I finally did something about it:

http://rails.lighthouseapp.com/projects/8994-ruby-on-rails/tickets/1321
http://github.com/dchelimsky/rails/commit/03be483

Cheers,
David
>
> To get this to work you''ll have to either use real records (with
IDs)
> or stub whatever it is that is supplying the Relative and then expect
> with(the_relative_you_supply_as_a_stub_value).
>
> Make sense?
>
>>
>> Tom
>> --
>> Posted via http://www.ruby-forum.com/.
>> _______________________________________________
>> rspec-users mailing list
>> rspec-users at rubyforge.org
>> http://rubyforge.org/mailman/listinfo/rspec-users
>>
>