Stub (...) received unexpected message (...) with (no args)

Question

I try to write a test using RR. What I need is a stub of a model object. ``` describe ApplicationController do subject(:application_controller) { ApplicationController.new } let(:messages) { ['a1', 'a2', 'a3' ] } let(:model) { Object.new } it 'should copy errors to flash' do stub(model).error_messages { messages } flash[:error] == nil subject.copy_errors_to_flash(model) flash[:error].should == messages end end ``` What I get is ``` ApplicationController should copy errors to flash Failure/Error: stub(model).error_messages { messages } Stub # received unexpected message :error_messages with (no args) # ./spec/controllers/application_controller_spec.rb:10:in `block (2 levels) in ' ``` I have no idea what am I doing wrong. I think I follow the docs...

Accepted Answer

You're calling the method 'error_messages on the stub of your model on this line:

```
stub(model).error_messages { messages }
```

I presume that you actually want to do something else here, most likely:

```
model.should_receive(:error_messages).and_return(messages)
```

which creates a stub method for error_messages and will respond with your messages array whenever your spec tests calls model.error_messages

Stub (...) received unexpected message (...) with (no args)

Solution

Problem