[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/imagegpt/test_image_processing_imagegpt.py

@@ -38,7 +38,7 @@ if is_vision_available():
     from transformers import ImageGPTImageProcessor
 
 
-class ImageGPTImageProcessingTester(unittest.TestCase):
+class ImageGPTImageProcessingTester:
     def __init__(
         self,
         parent,
@@ -51,7 +51,6 @@ class ImageGPTImageProcessingTester(unittest.TestCase):
         size=None,
         do_normalize=True,
     ):
-        super().__init__()
         size = size if size is not None else {"height": 18, "width": 18}
         self.parent = parent
         self.batch_size = batch_size