ImportError: cannot import name signals

I'm using Django 1.3.0 with Python 2.7.1. In every test I write the following imports I get the importError above:

from django.utils import unittest
from django.test.client import Client

The full stack trace:

  File "C:\Program Files (x86)\j2ee\plugins\org.python.pydev.debug_1.6.3.2010100513\pysrc\runfiles.py", line 342, in __get_module_from_str
    mod = __import__(modname)
  File "C:/Users/benjamin/workspace/BookIt/src/BookIt/tests\basic_flow.py", line 11, in 
    from django.test.client import Client
  File "C:\Python27\lib\site-packages\django\test\__init__.py", line 5, in 
    from django.test.client import Client, RequestFactory
  File "C:\Python27\lib\site-packages\django\test\client.py", line 21, in 
    from django.test import signals
ImportError: cannot import name signals
ERROR: Module: basic_flow could not be imported.

Any ideas why this happening ?