add MinIOClient in TestBase

Author: geetu040

openml/testing.py

@@ -16,7 +16,7 @@
 import requests
 
 import openml
-from openml._api import HTTPCache, HTTPClient
+from openml._api import HTTPCache, HTTPClient, MinIOClient
 from openml.enums import RetryPolicy
 from openml.exceptions import OpenMLServerException
 from openml.tasks import TaskType
@@ -317,6 +317,7 @@ def setUp(self) -> None:
             retry_policy=self.retry_policy,
             cache=self.cache,
         )
+        self.minio_client = self._get_minio_client(path=Path(self.dir))
 
         if self.cache.path.exists():
             shutil.rmtree(self.cache.path)
@@ -355,6 +356,12 @@ def _get_http_client(  # noqa: PLR0913
             cache=cache,
         )
 
+    def _get_minio_client(
+        self,
+        path: Path | None = None,
+    ) -> MinIOClient:
+        return MinIOClient(path=path)
+
     def _get_url(
         self,
         server: str | None = None,