Add ViTImageProcessorFast to tests (#31424)

* Add ViTImageProcessor to tests

* Correct data format

* Review comments

tests/models/maskformer/test_image_processing_maskformer.py

@@ -98,6 +98,8 @@ class MaskFormerImageProcessingTester(unittest.TestCase):
             image = image_inputs[0]
             if isinstance(image, Image.Image):
                 w, h = image.size
+            elif isinstance(image, np.ndarray):
+                h, w = image.shape[0], image.shape[1]
             else:
                 h, w = image.shape[1], image.shape[2]
             if w < h: