Fixed #28161 -- Fixed return type of ArrayField(CITextField()).

Thanks Tim for the review.

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())