diff --git a/src/dabdatasync/datasync.py b/src/dabdatasync/datasync.py
index 461b57f..15bcf72 100644
--- a/src/dabdatasync/datasync.py
+++ b/src/dabdatasync/datasync.py
@@ -33,6 +33,7 @@ class A_DataSync(ABC):
     """Abstract DataSync class"""
 
     service_name: str = "ABSTRACT"
+    priority: int = 0
 
     @classmethod
     @final
@@ -178,3 +179,8 @@ class DataSync_Factory:
         """decorator to register a concrete class to the factory"""
         cls.ar_cls_DataSync.add(_cls)
         return _cls
+
+    @classmethod
+    def get_list(cls) -> list[str]:
+        """return the available DataSync concrete class name list"""
+        return [ _.service_name for _ in cls.ar_cls_DataSync]
diff --git a/src/dabdatasync/datasync_nextcloud.py b/src/dabdatasync/datasync_nextcloud.py
index 0f2b02d..7801fc8 100644
--- a/src/dabdatasync/datasync_nextcloud.py
+++ b/src/dabdatasync/datasync_nextcloud.py
@@ -32,6 +32,7 @@ class C_DataSync_NextCloud(A_DataSync):
     """Concrete DataSync class - Nextcloud"""
 
     service_name: str = "Nextcloud"
+    priority: int = 100
 
     def __init__(self, manifest: dict[Any, Any], cls_compressor: type[A_DataSync_Compressor]) -> None:
         super().__init__(manifest, cls_compressor)
diff --git a/test/test_datasync.py b/test/test_datasync.py
index 5a280d5..7d63545 100644
--- a/test/test_datasync.py
+++ b/test/test_datasync.py
@@ -44,8 +44,8 @@ class TestDabDataSync(unittest.TestCase):
                 nextcloud_pwd=pwd_file.read()
         else:
             raise RuntimeError("NextCloud pwd file not found")
-        files = glob.glob(str(testdir_path / "test_data" / "*.json"))
-        files += glob.glob(str(testdir_path / "test_data2" / "*.json"))
+        files = glob.glob(str(testdir_path / "*.json"))
+        files += glob.glob(str(testdir_path /"*.json"))
         for file in files:
             with open(file) as f:
                 data = json.load(f)