[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/vilt/test_image_processing_vilt.py

@@ -30,7 +30,7 @@ if is_vision_available():
     from transformers import ViltImageProcessor
 
 
-class ViltImageProcessingTester(unittest.TestCase):
+class ViltImageProcessingTester:
     def __init__(
         self,
         parent,
@@ -46,7 +46,6 @@ class ViltImageProcessingTester(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": 30}
         self.parent = parent
         self.batch_size = batch_size