[1.2.X] Fixed an invalid import in the GeoDjango 3D tests.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@15804 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/gis/tests/geo3d/tests.py

@@ -1,6 +1,6 @@
 import os
 import re
-from django.utils.unittest import TestCase
+from unittest import TestCase
 from django.contrib.gis.db.models import Union, Extent3D
 from django.contrib.gis.geos import GEOSGeometry, Point, Polygon
 from django.contrib.gis.utils import LayerMapping, LayerMapError