[tests] fix "Tester object has no attribute '_testMethodName'" (#34910)

* add more cases

* fix method not found in unittest

Signed-off-by: Lin, Fanli <fanli.lin@intel.com>

* fix more cases

* add more models

* add all

* no unittest.case

* remove for oneformer

* fix style

---------

Signed-off-by: Lin, Fanli <fanli.lin@intel.com>

tests/models/dac/test_feature_extraction_dac.py

@@ -51,7 +51,7 @@ def floats_list(shape, scale=1.0, rng=None, name=None):
 
 @require_torch
 # Copied from transformers.tests.encodec.test_feature_extraction_dac.EncodecFeatureExtractionTester with Encodec->Dac
-class DacFeatureExtractionTester(unittest.TestCase):
+class DacFeatureExtractionTester:
     # Ignore copy
     def __init__(
         self,