[2.0.x] Fixed #28849 -- Fixed referenced table and column rename on SQLite.

Thanks Ramiro for the input and Tim for the review.

Backport of 095c1aaa89 from master

tests/backends/sqlite/tests.py

@@ -5,11 +5,14 @@ import unittest
 from django.core.exceptions import ImproperlyConfigured
 from django.db import connection
 from django.db.models import Avg, StdDev, Sum, Variance
+from django.db.models.fields import CharField
+from django.db.utils import NotSupportedError
 from django.test import (
     TestCase, TransactionTestCase, override_settings, skipUnlessDBFeature,
 )
+from django.test.utils import isolate_apps
 
-from ..models import Item, Object, Square
+from ..models import Author, Item, Object, Square
 
 
 @unittest.skipUnless(connection.vendor == 'sqlite', 'SQLite tests')
@@ -71,6 +74,44 @@ class Tests(TestCase):
                 creation._get_test_db_name()
 
 
+@unittest.skipUnless(connection.vendor == 'sqlite', 'SQLite tests')
+@isolate_apps('backends')
+class SchemaTests(TransactionTestCase):
+
+    available_apps = ['backends']
+
+    def test_field_rename_inside_atomic_block(self):
+        """
+        NotImplementedError is raised when a model field rename is attempted
+        inside an atomic block.
+        """
+        new_field = CharField(max_length=255, unique=True)
+        new_field.set_attributes_from_name('renamed')
+        msg = (
+            "Renaming the 'backends_author'.'name' column while in a "
+            "transaction is not supported on SQLite because it would break "
+            "referential integrity. Try adding `atomic = False` to the "
+            "Migration class."
+        )
+        with self.assertRaisesMessage(NotSupportedError, msg):
+            with connection.schema_editor(atomic=True) as editor:
+                editor.alter_field(Author, Author._meta.get_field('name'), new_field)
+
+    def test_table_rename_inside_atomic_block(self):
+        """
+        NotImplementedError is raised when a table rename is attempted inside
+        an atomic block.
+        """
+        msg = (
+            "Renaming the 'backends_author' table while in a transaction is "
+            "not supported on SQLite because it would break referential "
+            "integrity. Try adding `atomic = False` to the Migration class."
+        )
+        with self.assertRaisesMessage(NotSupportedError, msg):
+            with connection.schema_editor(atomic=True) as editor:
+                editor.alter_db_table(Author, "backends_author", "renamed_table")
+
+
 @unittest.skipUnless(connection.vendor == 'sqlite', 'Test only for SQLite')
 @override_settings(DEBUG=True)
 class LastExecutedQueryTest(TestCase):