[1.2.X] Fixed #14148 -- Ensure the admin_script tests always use an a…

…bsolute path; PyPy (and sometimes CPython) return relative paths for __file__. Thanks to Alex Gaynor for the report and patch.

Backport of r13618 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@13619 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/admin_scripts/tests.py

@@ -133,7 +133,7 @@ def run_test(self, script, args, settings_file=None, apps=None):
         return out, err
 
     def run_django_admin(self, args, settings_file=None):
-        bin_dir = os.path.dirname(bin.__file__)
+        bin_dir = os.path.abspath(os.path.dirname(bin.__file__))
         return self.run_test(os.path.join(bin_dir,'django-admin.py'), args, settings_file)
 
     def run_manage(self, args, settings_file=None):