Switched TestCase to SimpleTestCase in GIS tests.

tests/gis_tests/geoadmin/tests.py

 from django.contrib.gis import admin
 from django.contrib.gis.geos import Point
-from django.test import TestCase, override_settings
+from django.test import SimpleTestCase, override_settings
 
 from .admin import UnmodifiableAdmin
 from .models import City, site
 
 
 @override_settings(ROOT_URLCONF='django.contrib.gis.tests.geoadmin.urls')
-class GeoAdminTest(TestCase):
+class GeoAdminTest(SimpleTestCase):
 
     def test_ensure_geographic_media(self):
         geoadmin = site._registry[City]

tests/gis_tests/inspectapp/tests.py

@@ -6,7 +6,7 @@ from django.contrib.gis.gdal import GDAL_VERSION, Driver, GDALException
 from django.contrib.gis.utils.ogrinspect import ogrinspect
 from django.core.management import call_command
 from django.db import connection, connections
-from django.test import TestCase, skipUnlessDBFeature
+from django.test import SimpleTestCase, TestCase, skipUnlessDBFeature
 from django.test.utils import modify_settings
 
 from ..test_data import TEST_DATA
@@ -59,7 +59,7 @@ class InspectDbTests(TestCase):
 @modify_settings(
     INSTALLED_APPS={'append': 'django.contrib.gis'},
 )
-class OGRInspectTest(TestCase):
+class OGRInspectTest(SimpleTestCase):
     expected_srid = 'srid=-1' if GDAL_VERSION < (2, 2) else ''
     maxDiff = 1024