[1.8.x] Refs #22962 -- Made test case use non-conflicting table names

Backport of b06935a4 from master

tests/postgres_tests/array_default_migrations/0001_initial.py

@@ -12,27 +12,7 @@ class Migration(migrations.Migration):
 
     operations = [
         migrations.CreateModel(
-            name='CharArrayModel',
-            fields=[
-                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
-                ('field', django.contrib.postgres.fields.ArrayField(models.CharField(max_length=10), size=None)),
-            ],
-            options={
-            },
-            bases=(models.Model,),
-        ),
-        migrations.CreateModel(
-            name='DateTimeArrayModel',
-            fields=[
-                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
-                ('field', django.contrib.postgres.fields.ArrayField(models.DateTimeField(), size=None)),
-            ],
-            options={
-            },
-            bases=(models.Model,),
-        ),
-        migrations.CreateModel(
-            name='IntegerArrayModel',
+            name='IntegerArrayDefaultModel',
             fields=[
                 ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
                 ('field', django.contrib.postgres.fields.ArrayField(models.IntegerField(), size=None)),
@@ -41,24 +21,4 @@ class Migration(migrations.Migration):
             },
             bases=(models.Model,),
         ),
-        migrations.CreateModel(
-            name='NestedIntegerArrayModel',
-            fields=[
-                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
-                ('field', django.contrib.postgres.fields.ArrayField(django.contrib.postgres.fields.ArrayField(models.IntegerField(), size=None), size=None)),
-            ],
-            options={
-            },
-            bases=(models.Model,),
-        ),
-        migrations.CreateModel(
-            name='NullableIntegerArrayModel',
-            fields=[
-                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
-                ('field', django.contrib.postgres.fields.ArrayField(models.IntegerField(), size=None, null=True, blank=True)),
-            ],
-            options={
-            },
-            bases=(models.Model,),
-        ),
     ]

tests/postgres_tests/array_default_migrations/0002_integerarraymodel_field_2.py

@@ -13,7 +13,7 @@ class Migration(migrations.Migration):
 
     operations = [
         migrations.AddField(
-            model_name='integerarraymodel',
+            model_name='integerarraydefaultmodel',
             name='field_2',
             field=django.contrib.postgres.fields.ArrayField(models.IntegerField(), default=[], size=None),
             preserve_default=False,

tests/postgres_tests/test_array.py

@@ -9,7 +9,7 @@ from django.contrib.postgres.forms import SimpleArrayField, SplitArrayField
 from django.core import exceptions, serializers
 from django.core.management import call_command
 from django.db import IntegrityError, connection, models
-from django.test import TestCase, override_settings
+from django.test import TestCase, TransactionTestCase, override_settings
 from django.utils import timezone
 
 from .models import (
@@ -243,7 +243,9 @@ class TestChecks(TestCase):
         self.assertEqual(errors[0].id, 'postgres.E002')
 
 
-class TestMigrations(TestCase):
+class TestMigrations(TransactionTestCase):
+
+    available_apps = ['postgres_tests']
 
     def test_deconstruct(self):
         field = ArrayField(models.IntegerField())
@@ -278,7 +280,15 @@ class TestMigrations(TestCase):
     })
     def test_adding_field_with_default(self):
         # See #22962
+        table_name = 'postgres_tests_integerarraydefaultmodel'
+        with connection.cursor() as cursor:
+            self.assertNotIn(table_name, connection.introspection.table_names(cursor))
         call_command('migrate', 'postgres_tests', verbosity=0)
+        with connection.cursor() as cursor:
+            self.assertIn(table_name, connection.introspection.table_names(cursor))
+        call_command('migrate', 'postgres_tests', 'zero', verbosity=0)
+        with connection.cursor() as cursor:
+            self.assertNotIn(table_name, connection.introspection.table_names(cursor))
 
 
 @unittest.skipUnless(connection.vendor == 'postgresql', 'PostgreSQL required')