Lock/unlock of db breaks if pytest is executed twice in the same process

Author: boxed

pytest_django/plugin.py

@@ -800,8 +800,9 @@ def _dj_db_wrapper(self) -> django.db.backends.base.base.BaseDatabaseWrapper:
 
         # The first time the _dj_db_wrapper is accessed, we will save a
         # reference to the real implementation.
-        if self._real_ensure_connection is None:
-            self._real_ensure_connection = BaseDatabaseWrapper.ensure_connection
+        if not hasattr(BaseDatabaseWrapper, "_real_ensure_connection"):
+            BaseDatabaseWrapper._real_ensure_connection = BaseDatabaseWrapper.ensure_connection
+        self._real_ensure_connection = BaseDatabaseWrapper._real_ensure_connection
 
         return BaseDatabaseWrapper