fix: Add partition attribute to BaseTest (#2903)

Co-authored-by: Andrew Cristina <[email protected]>

Author: acristin

integration/helpers/base_test.py

@@ -6,6 +6,7 @@
 import botocore
 import pytest
 import requests
+from samtranslator.translator.arn_generator import ArnGenerator
 from samtranslator.yaml_helper import yaml_parse
 from tenacity import (
     after_log,
@@ -95,6 +96,7 @@ def setUpClass(cls):
         cls.code_dir = Path(cls.resources_dir, "code")
         cls.session = boto3.session.Session()
         cls.my_region = cls.session.region_name
+        cls.partition = ArnGenerator.get_partition_name(cls.my_region)
         cls.client_provider = ClientProvider()
         cls.file_to_s3_uri_map = read_test_config_file("file_to_s3_map_modified.json")
         cls.code_key_to_file = read_test_config_file("code_key_to_file_map.json")