initialize the response

lib/zero/controller.rb

@@ -50,7 +50,7 @@ module Zero
     # @param env [Hash] a rack compatible environment
     def initialize(env)
       @request  = self.class.request.new(env)
-      @response = self.class.response
+      @response = self.class.response.new
       @renderer = self.class.renderer
     end
 

spec/unit/controller/call_spec.rb

@@ -24,4 +24,18 @@ describe Zero::Controller, '.call' do
     r = Zero::Request.new(env)
     expect(r.params['foo']).to eq('bar')
   end
+
+  context "with the response" do
+    let(:response_class) { mock }
+    before :each do
+      Zero::Controller.response = response_class
+      response_class.should_receive(:new)
+    end
+
+    after :each do
+      Zero::Controller.response = nil
+    end
+
+    it { subject }
+  end
 end