specs for the renderer access

spec/unit/controller/renderer_spec.rb

@@ -0,0 +1,11 @@
+require 'spec_helper'
+
+describe Zero::Controller, '#renderer' do
+  subject { Zero::Controller }
+  let(:renderer) { Object.new }
+  
+  it 'returns the set renderer' do
+    subject.renderer = renderer
+    expect(subject.new(Object.new).renderer).to be(renderer)
+  end
+end