>: cat spec/controllers/simple_spec.rb
require File.expand_path(File.dirname(__FILE__) + '/../spec_helper')

class DummyController < ActionController::Base
end

describe DummyController do
  context "looking at a mock" do
    subject { mock('wibble', :froob => 'drabble') }

    # This passes as both a model spec and a controller spec
    it "has drabble as its froob" do
      subject.froob.should == 'drabble'
    end

    # This fails as a controller spec but passes as a model spec
    its(:froob) { should == 'drabble' }
  end
end

>: cat spec/models/simple_spec.rb
# This file is identical to spec/controllers/simple_spec.rb
require File.expand_path(File.dirname(__FILE__) + '/../spec_helper')

class DummyController < ActionController::Base
end

describe DummyController do
  context "looking at a mock" do
    subject { mock('wibble', :froob => 'drabble') }

    # This passes as both a model spec and a controller spec
    it "has drabble as its froob" do
      subject.froob.should == 'drabble'
    end

    # This fails as a controller spec but passes as a model spec
    its(:froob) { should == 'drabble' }
  end
end

>: ./script/spec spec/controllers/simple_spec.rb -b
.F

1)
NoMethodError in 'DummyController looking at a mock froob should == "drabble"'
undefined method `froob' for #<DummyController:0x102bcdce0>
/my/project/vendor/gems/rspec-1.3.0/lib/spec/example/subject.rb:25:in `send'
/my/project/vendor/gems/rspec-1.3.0/lib/spec/example/subject.rb:25:in `subject'
/my/project/vendor/gems/rspec-1.3.0/lib/spec/example/subject.rb:91:in `should'
./spec/controllers/simple_spec.rb:14:
/my/project/vendor/gems/rspec-1.3.0/lib/spec/example/example_methods.rb:40:in `instance_eval'
/my/project/vendor/gems/rspec-1.3.0/lib/spec/example/example_methods.rb:40:in `execute'
/Users/tomtt/.rvm/rubies/ruby-1.8.7-p249/lib/ruby/1.8/timeout.rb:53:in `timeout'
/my/project/vendor/gems/rspec-1.3.0/lib/spec/example/example_methods.rb:37:in `execute'
/my/project/vendor/gems/rspec-1.3.0/lib/spec/example/example_group_methods.rb:214:in `run_examples'
/my/project/vendor/gems/rspec-1.3.0/lib/spec/example/example_group_methods.rb:212:in `each'
/my/project/vendor/gems/rspec-1.3.0/lib/spec/example/example_group_methods.rb:212:in `run_examples'
/my/project/vendor/gems/rspec-1.3.0/lib/spec/example/example_group_methods.rb:103:in `run'
/my/project/vendor/gems/rspec-1.3.0/lib/spec/runner/example_group_runner.rb:23:in `run'
/my/project/vendor/gems/rspec-1.3.0/lib/spec/runner/example_group_runner.rb:22:in `each'
/my/project/vendor/gems/rspec-1.3.0/lib/spec/runner/example_group_runner.rb:22:in `run'
/my/project/vendor/gems/rspec-1.3.0/lib/spec/runner/options.rb:152:in `run_examples'
/my/project/vendor/gems/rspec-1.3.0/lib/spec/runner/command_line.rb:9:in `run'
./script/spec:10:

Finished in 0.027559 seconds

2 examples, 1 failure

>: ./script/spec spec/models/simple_spec.rb -b
..

Finished in 0.026743 seconds

2 examples, 0 failures