Added test skipping for a PostgreSQL JSONField test.

tests/postgres_tests/test_introspection.py

@@ -1,6 +1,7 @@
 from io import StringIO
 
 from django.core.management import call_command
+from django.test import skipUnlessDBFeature
 from django.test.utils import modify_settings
 
 from . import PostgreSQLTestCase
@@ -19,6 +20,7 @@ class InspectDBTests(PostgreSQLTestCase):
         for field_output in field_outputs:
             self.assertIn(field_output, output)
 
+    @skipUnlessDBFeature('has_jsonb_datatype')
     def test_json_field(self):
         self.assertFieldsInModel(
             'postgres_tests_jsonmodel',