[pytes collection] Fix flax test collection (#34004)

bit weird but to filter I had to use this

tests/models/beit/test_modeling_flax_beit.py

@@ -79,6 +79,7 @@ class FlaxBeitModelTester(unittest.TestCase):
         # in BeiT, the seq length equals the number of patches + 1 (we add 1 for the [CLS] token)
         num_patches = (image_size // patch_size) ** 2
         self.seq_length = num_patches + 1
+        super().__init__()
 
     def prepare_config_and_inputs(self):
         pixel_values = floats_tensor([self.batch_size, self.num_channels, self.image_size, self.image_size])