test against preview

Author: tsmathis

mp_api/client/core/settings.py

@@ -19,7 +19,7 @@
 _MAX_LIST_LENGTH = min(PMG_SETTINGS.get("MPRESTER_MAX_LIST_LENGTH", 10000), 10000)
 
 _EMMET_SETTINGS = EmmetSettings()  # type: ignore[call-arg]
-_DEFAULT_ENDPOINT = "https://api.materialsproject.org/"
+_DEFAULT_ENDPOINT = "https://api-preview.materialsproject.org/"
 
 
 class MAPIClientSettings(BaseSettings):