Enable passing custom options to rack handler

lib/shamrock/service.rb

@@ -11,18 +11,18 @@ class Service
     def initialize(rack_app, options = {})
       @rack_app = rack_app
 
-      options   = DEFAULT_OPTIONS.merge(options)
+      @options  = DEFAULT_OPTIONS.merge(options)
 
-      @handler  = options[:handler]
+      @handler  = @options.delete(:handler)
 
-      @port     = options[:port] || find_available_port
+      @port     = @options.delete(:port) || find_available_port
       @url      = "http://localhost:#{port}"
-      @monitor  = options[:monitor].new(Http.new(url))
+      @monitor  = @options.delete(:monitor).new(Http.new(url))
     end
 
     def start
       @thread = Thread.new do
-        @handler.run(@rack_app, Port: port)
+        @handler.run(@rack_app, @options.merge(Port: port))
       end
 
       @monitor.wait_until_ready

spec/shamrock/service_spec.rb

@@ -28,6 +28,16 @@
       service.start
     end
 
+    it "should start the server with custom handler options" do
+      monitor = mock('monitor', wait_until_ready: true)
+      monitor_class = mock('monitor class', new: monitor)
+
+      handler = mock('handler')
+      service = Shamrock::Service.new(@rack_app, handler: handler, monitor: monitor_class, foo: 'bar')
+      handler.should_receive(:run).with(@rack_app, Port: service.port, foo: 'bar')
+      service.start
+    end
+
     it "should wait for the server to become available" do
       monitor = mock('monitor')
       monitor_class = mock('monitor class', new: monitor)