text: from unittest import TestCase
  from cStringIO import StringIO
  
  import json
  
  class TestDump(TestCase):
      def test_dump(self):
          sio = StringIO()
          json.dump({}, sio)
          self.assertEquals(sio.getvalue(), '{}')
  
      def test_dumps(self):
          self.assertEquals(json.dumps({}), '{}')
  