[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/electra/test_modeling_flax_electra.py

@@ -21,7 +21,7 @@ if is_flax_available():
     )
 
 
-class FlaxElectraModelTester(unittest.TestCase):
+class FlaxElectraModelTester:
     def __init__(
         self,
         parent,
@@ -67,7 +67,6 @@ class FlaxElectraModelTester(unittest.TestCase):
         self.type_sequence_label_size = type_sequence_label_size
         self.initializer_range = initializer_range
         self.num_choices = num_choices
-        super().__init__()
 
     def prepare_config_and_inputs(self):
         input_ids = ids_tensor([self.batch_size, self.seq_length], self.vocab_size)