[fbsync] More robust check in tests for 16 bits images (#5652)

Summary: (Note: this ignores all push blocking failures!)

Reviewed By: datumbox

Differential Revision: D35216771

fbshipit-source-id: 50e27c56e7453c808af7ae34bb0cab9b4d778d75

test/test_image.py

@@ -158,7 +158,7 @@ def test_decode_png(img_path, pil_mode, mode):
 
     img_pil = normalize_dimensions(img_pil)
 
-    if "16" in img_path:
+    if img_path.endswith("16.png"):
         # 16 bits image decoding is supported, but only as a private API
         # FIXME: see https://github.com/pytorch/vision/issues/4731 for potential solutions to making it public
         with pytest.raises(RuntimeError, match="At most 8-bit PNG images are supported"):