Usage of fixtures to set up sites breaks tests

[madkinder@…]

#7517 led to this bug.
One might use fixtures to set up project's sites.

Steps to reproduce:

1. Create the following initial_data.xml fixture:

   <?xml version="1.0" encoding="utf-8"?>
   <django-objects version="1.0">
     <object pk="1" model="sites.site">
       <field type="CharField" name="domain">127.0.0.1:8000</field>
       <field type="CharField" name="name">testserver</field>
     </object>
   </django-objects>
   

2. Run ./manage.py test. The test fails with the following message:

   File "/usr/local/lib/python2.5/site-packages/django/contrib/sites/tests.py", line 5, in django.contrib.sites.tests
   Failed example:
       s
   Expected:
       <Site: example.com>
   Got:
       <Site: 127.0.0.1:8000>
   

The reason is obvious: example.com is hardcoded into doctest.

[Russell Keith-Magee]

(In [7738]) Fixed #7531 -- Modified the sites test so that user-provided initial data doesn't cause breakage when executed from within user applications. Thanks for the report, madkinder@….