[tests] further fix Tester object has no attribute '_testMethodName' (#35781)

* bug fix

* update with more cases

* more entries

* Fix

---------

Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>

tests/models/levit/test_image_processing_levit.py

@@ -26,7 +26,7 @@ if is_vision_available():
     from transformers import LevitImageProcessor
 
 
-class LevitImageProcessingTester(unittest.TestCase):
+class LevitImageProcessingTester:
     def __init__(
         self,
         parent,
@@ -43,7 +43,6 @@ class LevitImageProcessingTester(unittest.TestCase):
         image_mean=[0.5, 0.5, 0.5],
         image_std=[0.5, 0.5, 0.5],
     ):
-        super().__init__()
         size = size if size is not None else {"shortest_edge": 18}
         crop_size = crop_size if crop_size is not None else {"height": 18, "width": 18}
         self.parent = parent