new_contents: import sys
  
  from nose import with_setup
  from nose.tools import assert_equals, raises
  
  from wigiki.config import ConfigReader
  from wigiki.exceptions import *
  
  
  if sys.version_info >= (3,):
      from io import StringIO
  else:
      from StringIO import StringIO
  
  
  class TestReaderMinimal():
      """Test reader with a minimal configuration file"""
  
      def setup(self):
          config = '''
          {
              "gists": {
                  "user": { "title": "id" }
              }
          }
          '''
          f = StringIO(config)
          self.reader = ConfigReader(f.read())
  
      def test_read_site(self):
          assert_equals(self.reader.site, {})
  
      def test_read_gists(self):
          data = {'user': {'title': 'id'}}
          assert_equals(self.reader.gists, data)
  
      def test_read_app(self):
          assert_equals(self.reader.application, {})
  
  
  class TestReaderInvalid():
      """Test reader with a wrong configuration file"""
  
      def setup(self):
          config = '''
          {
              "app" : { "baseurl": "/" }
          }
          '''
          f = StringIO(config)
          self.reader = ConfigReader(f.read())
  
      @raises(WigikiConfigError)
      def test_read_sists(self):
          self.reader.gists
  
subject: add tests for configuration reader class