Rack::Client::Parser's not working as expected

lib/rack/client/parser/json.rb

@@ -6,6 +6,7 @@ module Parser
       class JSON < Parser::Base
 
         content_type 'application', 'json'
+        content_type 'application', 'json', 'charset=utf-8'
 
         def encode(input)
           output = StringIO.new
@@ -48,7 +49,7 @@ def decode(body)
         end
       end
 
-      Yaml = YAML
+      Json = JSON
     end
   end
 end

spec/parser/json_spec.rb

@@ -0,0 +1,18 @@
+require 'spec_helper'
+
+describe Rack::Client::Parser::JSON do
+  it "should be returned for application/json" do
+    Rack::Client::Parser::Base.lookup("application/json").should == Rack::Client::Parser::JSON
+  end
+
+  it "should be returned for application/json;charset=utf-8" do
+    Rack::Client::Parser::Base.lookup("application/json;charset=utf-8").should == Rack::Client::Parser::JSON
+  end
+
+  sync_handler_contexts(Rack::Client::Parser) do
+    it 'parses json and makes it ruby' do
+      request { get('/json/json') }
+      response { body.should == {"key" => "value"} }
+    end
+  end
+end

spec/spec_apps/json.ru

@@ -0,0 +1,10 @@
+require 'sinatra/base'
+
+class Json < Sinatra::Base
+  get '/json' do
+    content_type :json
+    '{"key":"value"}'
+  end
+end
+
+run Json