[1.11.x] Fixed #28161 -- Fixed return type of ArrayField(CITextField()).

Thanks Tim for the review.

Backport of b91868507a from master.

tests/postgres_tests/__init__.py

@@ -12,14 +12,14 @@ class PostgreSQLTestCase(TestCase):
     @classmethod
     def tearDownClass(cls):
         # No need to keep that signal overhead for non PostgreSQL-related tests.
-        from django.contrib.postgres.signals import register_hstore_handler
+        from django.contrib.postgres.signals import register_type_handlers
 
-        connection_created.disconnect(register_hstore_handler)
+        connection_created.disconnect(register_type_handlers)
         super(PostgreSQLTestCase, cls).tearDownClass()
 
 
 @unittest.skipUnless(connection.vendor == 'postgresql', "PostgreSQL specific tests")
 # To locate the widget's template.
 @modify_settings(INSTALLED_APPS={'append': 'django.contrib.postgres'})
-class PostgreSQLWidgetTestCase(WidgetTest):
+class PostgreSQLWidgetTestCase(WidgetTest, PostgreSQLTestCase):
     pass

tests/postgres_tests/migrations/0002_create_test_models.py

@@ -144,6 +144,7 @@ class Migration(migrations.Migration):
                 ('name', CICharField(primary_key=True, max_length=255)),
                 ('email', CIEmailField()),
                 ('description', CITextField()),
+                ('array_field', ArrayField(CITextField(), null=True)),
             ],
             options={
                 'required_db_vendor': 'postgresql',

tests/postgres_tests/models.py

@@ -105,6 +105,7 @@ class CITestModel(PostgreSQLModel):
     name = CICharField(primary_key=True, max_length=255)
     email = CIEmailField()
     description = CITextField()
+    array_field = ArrayField(CITextField(), null=True)
 
     def __str__(self):
         return self.name

tests/postgres_tests/test_citext.py

@@ -4,11 +4,13 @@ strings and thus eliminates the need for operations such as iexact and other
 modifiers to enforce use of an index.
 """
 from django.db import IntegrityError
+from django.test.utils import modify_settings
 
 from . import PostgreSQLTestCase
 from .models import CITestModel
 
 
+@modify_settings(INSTALLED_APPS={'append': 'django.contrib.postgres'})
 class CITextTestCase(PostgreSQLTestCase):
 
     @classmethod
@@ -17,6 +19,7 @@ class CITextTestCase(PostgreSQLTestCase):
             name='JoHn',
             email='joHn@johN.com',
             description='Average Joe named JoHn',
+            array_field=['JoE', 'jOhn'],
         )
 
     def test_equal_lowercase(self):
@@ -34,3 +37,8 @@ class CITextTestCase(PostgreSQLTestCase):
         """
         with self.assertRaises(IntegrityError):
             CITestModel.objects.create(name='John')
+
+    def test_array_field(self):
+        instance = CITestModel.objects.get()
+        self.assertEqual(instance.array_field, self.john.array_field)
+        self.assertTrue(CITestModel.objects.filter(array_field__contains=['joe']).exists())