new_contents: #! /usr/bin/env python
  # -*- coding: iso-8859-1 -*-
  # vi:ts=4:et
  
  import os.path
  import pycurl
  import sys
  import unittest
  
  class WriteAbortTest(unittest.TestCase):
      def setUp(self):
          self.curl = pycurl.Curl()
  
      def tearDown(self):
          self.curl.close()
  
      def write_cb_returning_string(self, data):
          return 'foo'
  
      def write_cb_returning_float(self, data):
          return 0.5
  
      def test_write_cb_returning_string(self):
          self.check(self.write_cb_returning_string)
      
      def test_write_cb_returning_float(self):
          self.check(self.write_cb_returning_float)
      
      def check(self, write_cb):
          # download the script itself through the file:// protocol into write_cb
          c = pycurl.Curl()
          self.curl.setopt(pycurl.URL, 'file://' + os.path.abspath(sys.argv[0]))
          self.curl.setopt(pycurl.WRITEFUNCTION, write_cb)
          try:
              self.curl.perform()
          except pycurl.error, (err, msg):
              # we expect pycurl.E_WRITE_ERROR as the response
              assert pycurl.E_WRITE_ERROR == err
  
          # actual error
          assert hasattr(sys, 'last_type')
          self.assertEqual(pycurl.error, sys.last_type)
          assert hasattr(sys, 'last_value')
          self.assertEqual('write callback must return int or None', str(sys.last_value))
  
subject: Check that bogus return values from write callback are correctly handled (still)