After thinking about it, there is nothing "engine specific" about any…

… of this new code. Therefore, no need to have engine specific specs.

spec/rspec/rails/configuration_spec.rb

@@ -31,7 +31,7 @@
   end
 
   describe '#application=' do
-    context 'for Rails 3.0', :not_at_least_rails_3_1 do
+    context 'for Rails 3.0', :unless => RSpec::Rails.at_least_rails_3_1? do
       it 'raises an error' do
         expect { RSpec.configuration.application = ::Rails.application }.to raise_error
       end

spec/rspec/rails/example/controller_example_group_spec.rb

@@ -96,18 +96,5 @@ module RSpec::Rails
         controller_class.superclass.should eq(ApplicationController)
       end
     end
-
-    describe "custom application", :at_least_rails_3_1 do
-      it "delegates named routes to the underlying controller" do
-        controller = double('controller')
-        controller.stub(:bars_path).and_return('/foos')
-
-        example = group.new
-        example.stub(:controller => controller)
-
-        example.instance_variable_set(:@orig_routes, RSpec.configuration.application.routes)
-        example.bars_path.should eq('/foos')
-      end
-    end
   end
 end

spec/rspec/rails/example/mailer_example_group_spec.rb

@@ -17,16 +17,5 @@ module ::Rails; end
       end
       group.metadata[:type].should eq(:mailer)
     end
-
-    describe "custom application", :at_least_rails_3_1 do
-      it "includes the custom application's url helpers" do
-        group = RSpec::Core::ExampleGroup.describe do
-          include MailerExampleGroup
-        end
-
-        example = group.new
-        example.bars_path.should == '/bars'
-      end
-    end
   end
 end

spec/rspec/rails/example/routing_example_group_spec.rb

@@ -28,19 +28,5 @@ module RSpec::Rails
         example.foo_path.should == "foo"
       end
     end
-
-    describe "custom application", :at_least_rails_3_1 do
-      it "provides routes of the custom application" do
-        group = RSpec::Core::ExampleGroup.describe do
-          include RoutingExampleGroup
-        end
-
-        example = group.new
-
-        # Because this relies on before hooks, I have to stub this in.
-        example.stub(:routes => RSpec.configuration.application.routes)
-        example.bars_path.should == "/bars"
-      end
-    end
   end
 end

spec/spec_helper.rb

@@ -19,17 +19,6 @@ def self.run_all(reporter=nil)
 RSpec.configure do |config|
   config.treat_symbols_as_metadata_keys_with_true_values = true
   config.filter_run :focus
-  if RSpec::Rails.at_least_rails_3_1?
-    config.filter_run_excluding :not_at_least_rails_3_1
-    config.around(:each, :at_least_rails_3_1) do |example|
-      orig_application = RSpec.configuration.application
-      RSpec.configuration.application = RSpec::EngineExample
-      example.run
-      RSpec.configuration.application = orig_application
-    end
-  else
-    config.filter_run_excluding :at_least_rails_3_1
-  end
   config.run_all_when_everything_filtered = true
   config.before(:each) do
     @real_world = RSpec.world