[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/markuplm/test_feature_extraction_markuplm.py

@@ -26,7 +26,7 @@ if is_bs4_available():
     from transformers import MarkupLMFeatureExtractor
 
 
-class MarkupLMFeatureExtractionTester(unittest.TestCase):
+class MarkupLMFeatureExtractionTester:
     def __init__(self, parent):
         self.parent = parent