added options to controller

This avoids hardcoding the options into the controller and therefore
should it make possible to use Rack::Request or Sinatra apps as
requests. (That sounds so weird.)

lib/zero/controller.rb

@@ -7,7 +7,7 @@ module Zero
   class Controller
     # initialize a new instance of the controller and call response on it
     def self.call(env)
-      new(Zero::Request.new(env)).response
+      new(env).response
     end
 
     # set the class to use for responses
@@ -20,6 +20,16 @@ module Zero
       @@response ||= Zero::Response
     end
 
+    # set a class to use for requests
+    def self.request=(request_class)
+      @@request = request_class
+    end
+
+    # return the set request class
+    def self.request
+      @@request ||= Zero::Request
+    end
+
     # set the renderer to use in the controller
     def self.renderer=(renderer)
       @@renderer = renderer
@@ -35,10 +45,11 @@ module Zero
 
     # initialize the controller
     #
-    # At initialization `@request`, `@response` and `@renderer` are set.
-    # @param request [Request] a request object
-    def initialize(request)
-      @request  = request
+    # This creates a new controller instance using the defined classes of
+    # renderer, request and response.
+    # @param env [Hash] a rack compatible environment
+    def initialize(env)
+      @request  = self.class.request.new(env)
       @response = self.class.response
       @renderer = self.class.renderer
     end

spec/unit/controller/renderer_spec.rb

@@ -3,9 +3,9 @@ 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)
+    expect(subject.new({}).renderer).to be(renderer)
   end
 end