Added skipUnless decorator in tests/backends/sqlite/test_parallel.py and reverted unrelated changes

django/db/backends/sqlite3/creation.py

@@ -88,8 +88,8 @@ class DatabaseCreation(BaseDatabaseCreation):
                 "NAME": f"{self.connection.alias}_{suffix}.sqlite3",
             }
         raise NotSupportedError(
-                f"Cloning with start method {start_method!r} is not supported."
-            )
+            f"Cloning with start method {start_method!r} is not supported."
+        )
 
     def _clone_test_db(self, suffix, verbosity, keepdb=False):
         source_database_name = self.connection.settings_dict["NAME"]

tests/backends/sqlite/test_parallel.py

@@ -1,11 +1,13 @@
 import shutil
 import tempfile
+import unittest
 from pathlib import Path
 
-from django.db import connections
+from django.db import connection, connections
 from django.test import TestCase
 
 
+@unittest.skipUnless(connection.vendor == "sqlite", "SQLite tests")
 class SQLiteParallelCloneTests(TestCase):
     """
     Tests that cloned SQLite test databases respect the original