W2v2 test require torch (#10665)

* Adds a @require_torch to a test that requires it

* Tokenizer too

* Style

tests/test_feature_extraction_wav2vec2.py

@@ -21,7 +21,7 @@ import unittest
 import numpy as np
 
 from transformers import WAV_2_VEC_2_PRETRAINED_MODEL_ARCHIVE_LIST, Wav2Vec2Config, Wav2Vec2FeatureExtractor
-from transformers.testing_utils import slow
+from transformers.testing_utils import require_torch, slow
 
 from .test_sequence_feature_extraction_common import SequenceFeatureExtractionTestMixin
 
@@ -134,6 +134,7 @@ class Wav2Vec2FeatureExtractionTest(SequenceFeatureExtractionTestMixin, unittest
         _check_zero_mean_unit_variance(input_values[2])
 
     @slow
+    @require_torch
     def test_pretrained_checkpoints_are_set_correctly(self):
         # this test makes sure that models that are using
         # group norm don't have their feature extractor return the