Apply suggestions from code review

Co-authored-by: Andrew Murray <3112309+radarhere@users.noreply.github.com>

Tests/test_core_resources.py

@@ -179,11 +179,11 @@ class TestEnvVars:
 
     @pytest.mark.parametrize(
         "var",
-        [
+        (
             {"PILLOW_ALIGNMENT": "15"},
             {"PILLOW_BLOCK_SIZE": "1024"},
             {"PILLOW_BLOCKS_MAX": "wat"},
-        ],
+        ),
     )
     def test_warnings(self, var):
         with pytest.warns(UserWarning):

Tests/test_file_webp.py

@@ -31,7 +31,8 @@ class TestUnsupportedWebp:
         file_path = "Tests/images/hopper.webp"
         with pytest.warns(UserWarning):
             with pytest.raises(OSError):
-                Image.open(file_path)
+                with Image.open(file_path):
+                    pass
 
         if HAVE_WEBP:
             WebPImagePlugin.SUPPORTED = True