Refs #35660 -- Updated TransactionTestCase methods into class or static methods.

django/test/testcases.py

@@ -379,14 +379,15 @@ class SimpleTestCase(unittest.TestCase):
                 result.addError(self, sys.exc_info())
                 return
 
-    def _pre_setup(self):
+    @classmethod
+    def _pre_setup(cls):
         """
         Perform pre-test setup:
         * Create a test client.
         * Clear the mail test outbox.
         """
-        self.client = self.client_class()
-        self.async_client = self.async_client_class()
+        cls.client = cls.client_class()
+        cls.async_client = cls.async_client_class()
         mail.outbox = []
 
     def _post_teardown(self):
@@ -1106,7 +1107,8 @@ class TransactionTestCase(SimpleTestCase):
     # This can be slow; this flag allows enabling on a per-case basis.
     serialized_rollback = False
 
-    def _pre_setup(self):
+    @classmethod
+    def _pre_setup(cls):
         """
         Perform pre-test setup:
         * If the class has an 'available_apps' attribute, restrict the app
@@ -1115,20 +1117,20 @@ class TransactionTestCase(SimpleTestCase):
         * If the class has a 'fixtures' attribute, install those fixtures.
         """
         super()._pre_setup()
-        if self.available_apps is not None:
-            apps.set_available_apps(self.available_apps)
+        if cls.available_apps is not None:
+            apps.set_available_apps(cls.available_apps)
             setting_changed.send(
                 sender=settings._wrapped.__class__,
                 setting="INSTALLED_APPS",
-                value=self.available_apps,
+                value=cls.available_apps,
                 enter=True,
             )
-            for db_name in self._databases_names(include_mirrors=False):
+            for db_name in cls._databases_names(include_mirrors=False):
                 emit_post_migrate_signal(verbosity=0, interactive=False, db=db_name)
         try:
-            self._fixture_setup()
+            cls._fixture_setup()
         except Exception:
-            if self.available_apps is not None:
+            if cls.available_apps is not None:
                 apps.unset_available_apps()
                 setting_changed.send(
                     sender=settings._wrapped.__class__,
@@ -1140,7 +1142,7 @@ class TransactionTestCase(SimpleTestCase):
         # Clear the queries_log so that it's less likely to overflow (a single
         # test probably won't execute 9K queries). If queries_log overflows,
         # then assertNumQueries() doesn't work.
-        for db_name in self._databases_names(include_mirrors=False):
+        for db_name in cls._databases_names(include_mirrors=False):
             connections[db_name].queries_log.clear()
 
     @classmethod
@@ -1156,7 +1158,8 @@ class TransactionTestCase(SimpleTestCase):
             )
         ]
 
-    def _reset_sequences(self, db_name):
+    @staticmethod
+    def _reset_sequences(db_name):
         conn = connections[db_name]
         if conn.features.supports_sequence_reset:
             sql_list = conn.ops.sequence_reset_by_name_sql(
@@ -1168,26 +1171,27 @@ class TransactionTestCase(SimpleTestCase):
                         for sql in sql_list:
                             cursor.execute(sql)
 
-    def _fixture_setup(self):
-        for db_name in self._databases_names(include_mirrors=False):
+    @classmethod
+    def _fixture_setup(cls):
+        for db_name in cls._databases_names(include_mirrors=False):
             # Reset sequences
-            if self.reset_sequences:
-                self._reset_sequences(db_name)
+            if cls.reset_sequences:
+                cls._reset_sequences(db_name)
 
             # Provide replica initial data from migrated apps, if needed.
-            if self.serialized_rollback and hasattr(
+            if cls.serialized_rollback and hasattr(
                 connections[db_name], "_test_serialized_contents"
             ):
-                if self.available_apps is not None:
+                if cls.available_apps is not None:
                     apps.unset_available_apps()
                 connections[db_name].creation.deserialize_db_from_string(
                     connections[db_name]._test_serialized_contents
                 )
-                if self.available_apps is not None:
-                    apps.set_available_apps(self.available_apps)
+                if cls.available_apps is not None:
+                    apps.set_available_apps(cls.available_apps)
 
-            if self.fixtures:
-                call_command("loaddata", *self.fixtures, verbosity=0, database=db_name)
+            if cls.fixtures:
+                call_command("loaddata", *cls.fixtures, verbosity=0, database=db_name)
 
     def _should_reload_connections(self):
         return True
@@ -1427,25 +1431,26 @@ class TestCase(TransactionTestCase):
             return False
         return super()._should_reload_connections()
 
-    def _fixture_setup(self):
-        if not self._databases_support_transactions():
+    @classmethod
+    def _fixture_setup(cls):
+        if not cls._databases_support_transactions():
             # If the backend does not support transactions, we should reload
             # class data before each test
-            self.setUpTestData()
+            cls.setUpTestData()
             return super()._fixture_setup()
 
-        if self.reset_sequences:
+        if cls.reset_sequences:
             raise TypeError("reset_sequences cannot be used on TestCase instances")
-        self.atomics = self._enter_atomics()
-        if not self._databases_support_savepoints():
-            if self.fixtures:
-                for db_name in self._databases_names(include_mirrors=False):
+        cls.atomics = cls._enter_atomics()
+        if not cls._databases_support_savepoints():
+            if cls.fixtures:
+                for db_name in cls._databases_names(include_mirrors=False):
                     call_command(
                         "loaddata",
-                        *self.fixtures,
+                        *cls.fixtures,
                         **{"verbosity": 0, "database": db_name},
                     )
-            self.setUpTestData()
+            cls.setUpTestData()
 
     def _fixture_teardown(self):
         if not self._databases_support_transactions():

tests/test_utils/test_testcase.py

@@ -65,14 +65,12 @@ class TestTestCase(TestCase):
 
     @skipUnlessDBFeature("supports_transactions")
     def test_reset_sequences(self):
-        old_reset_sequences = self.reset_sequences
-        self.reset_sequences = True
+        old_reset_sequences = self.__class__.reset_sequences
+        self.__class__.reset_sequences = True
+        self.addCleanup(setattr, self.__class__, "reset_sequences", old_reset_sequences)
         msg = "reset_sequences cannot be used on TestCase instances"
-        try:
-            with self.assertRaisesMessage(TypeError, msg):
-                self._fixture_setup()
-        finally:
-            self.reset_sequences = old_reset_sequences
+        with self.assertRaisesMessage(TypeError, msg):
+            self._fixture_setup()
 
 
 def assert_no_queries(test):