1 files changed, 31 insertions, 18 deletions
diff --git a/tests/postgres_tests/test_apps.py b/tests/postgres_tests/test_apps.py
index 94001822c2..340e555609 100644
--- a/tests/postgres_tests/test_apps.py
+++ b/tests/postgres_tests/test_apps.py
@@ -7,12 +7,12 @@ from django.test.utils import modify_settings
 from . import PostgreSQLTestCase
 
 try:
-    from psycopg2.extras import (
-        DateRange, DateTimeRange, DateTimeTZRange, NumericRange,
-    )
+    from psycopg2.extras import DateRange, DateTimeRange, DateTimeTZRange, NumericRange
 
     from django.contrib.postgres.fields import (
-        DateRangeField, DateTimeRangeField, DecimalRangeField,
+        DateRangeField,
+        DateTimeRangeField,
+        DecimalRangeField,
         IntegerRangeField,
     )
 except ImportError:
@@ -22,17 +22,24 @@ except ImportError:
 class PostgresConfigTests(PostgreSQLTestCase):
     def test_register_type_handlers_connection(self):
         from django.contrib.postgres.signals import register_type_handlers
-        self.assertNotIn(register_type_handlers, connection_created._live_receivers(None))
-        with modify_settings(INSTALLED_APPS={'append': 'django.contrib.postgres'}):
-            self.assertIn(register_type_handlers, connection_created._live_receivers(None))
-        self.assertNotIn(register_type_handlers, connection_created._live_receivers(None))
+
+        self.assertNotIn(
+            register_type_handlers, connection_created._live_receivers(None)
+        )
+        with modify_settings(INSTALLED_APPS={"append": "django.contrib.postgres"}):
+            self.assertIn(
+                register_type_handlers, connection_created._live_receivers(None)
+            )
+        self.assertNotIn(
+            register_type_handlers, connection_created._live_receivers(None)
+        )
 
     def test_register_serializer_for_migrations(self):
         tests = (
             (DateRange(empty=True), DateRangeField),
             (DateTimeRange(empty=True), DateRangeField),
-            (DateTimeTZRange(None, None, '[]'), DateTimeRangeField),
-            (NumericRange(Decimal('1.0'), Decimal('5.0'), '()'), DecimalRangeField),
+            (DateTimeTZRange(None, None, "[]"), DateTimeRangeField),
+            (NumericRange(Decimal("1.0"), Decimal("5.0"), "()"), DecimalRangeField),
             (NumericRange(1, 10), IntegerRangeField),
         )
 
@@ -40,25 +47,31 @@ class PostgresConfigTests(PostgreSQLTestCase):
             for default, test_field in tests:
                 with self.subTest(default=default):
                     field = test_field(default=default)
-                    with self.assertRaisesMessage(ValueError, 'Cannot serialize: %s' % default.__class__.__name__):
+                    with self.assertRaisesMessage(
+                        ValueError, "Cannot serialize: %s" % default.__class__.__name__
+                    ):
                         MigrationWriter.serialize(field)
 
         assertNotSerializable()
-        with self.modify_settings(INSTALLED_APPS={'append': 'django.contrib.postgres'}):
+        with self.modify_settings(INSTALLED_APPS={"append": "django.contrib.postgres"}):
             for default, test_field in tests:
                 with self.subTest(default=default):
                     field = test_field(default=default)
                     serialized_field, imports = MigrationWriter.serialize(field)
-                    self.assertEqual(imports, {
-                        'import django.contrib.postgres.fields.ranges',
-                        'import psycopg2.extras',
-                    })
+                    self.assertEqual(
+                        imports,
+                        {
+                            "import django.contrib.postgres.fields.ranges",
+                            "import psycopg2.extras",
+                        },
+                    )
                     self.assertIn(
-                        '%s.%s(default=psycopg2.extras.%r)' % (
+                        "%s.%s(default=psycopg2.extras.%r)"
+                        % (
                             field.__module__,
                             field.__class__.__name__,
                             default,
                         ),
-                        serialized_field
+                        serialized_field,
                     )
         assertNotSerializable()