[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/regnet/test_modeling_flax_regnet.py

@@ -36,7 +36,7 @@ if is_vision_available():
     from transformers import AutoImageProcessor
 
 
-class FlaxRegNetModelTester(unittest.TestCase):
+class FlaxRegNetModelTester:
     def __init__(
         self,
         parent,
@@ -65,7 +65,6 @@ class FlaxRegNetModelTester(unittest.TestCase):
         self.num_labels = num_labels
         self.scope = scope
         self.num_stages = len(hidden_sizes)
-        super().__init__()
 
     def prepare_config_and_inputs(self):
         pixel_values = floats_tensor([self.batch_size, self.num_channels, self.image_size, self.image_size])