new_contents: #!/usr/bin/env python
  #coding: utf-8
  
  from unittest import TestCase
  
  from redis import Redis, ResponseError
  
  from .common import *
  
  class LuaReturnErrorTestCase(TestCase):
  
      def test_lua_return_error(self):
          """Test the error described on issue 404 is fixed.
  
          https://github.com/twitter/twemproxy/issues/404
  
          """
          r = getconn()
          p = r.pipeline(transaction=False)
  
          p.set("test_key", "bananas!")
          p.eval('return {err="dummyerror"}', 1, "dummy_key")
          p.get("test_key")
  
          set_result, eval_result, get_result = p.execute(raise_on_error=False)
  
          assert_equal(True, set_result)
  
          assert_equal(True, isinstance(eval_result, ResponseError))
          assert_equal(str(eval_result), "dummyerror")
  
          assert_equal(get_result, b"bananas!")
  
subject: Add testcase of error with no space