Narrow Image type for bit_depth assertions to fix mypy

ajslater · ajslater · commit eddbdd254da8 · 2026-05-01T15:22:31.000-07:00
diff --git a/Tests/test_file_png.py b/Tests/test_file_png.py
@@ -233,6 +233,7 @@ def test_interlace(self) -> None:
     )
     def test_bit_depth(self, test_file: str, expected_bit_depth: int) -> None:
         with Image.open(test_file) as im:
+            assert isinstance(im, PngImagePlugin.PngImageFile)
             assert im.bit_depth == expected_bit_depth
 
     def test_load_transparent_p(self) -> None:

Original file line number	Diff line number	Diff line change
`@@ -233,6 +233,7 @@ def test_interlace(self) -> None:`
`233`	`233`	`)`
`234`	`234`	`def test_bit_depth(self, test_file: str, expected_bit_depth: int) -> None:`
`235`	`235`	`with Image.open(test_file) as im:`
	`236`	`+ assert isinstance(im, PngImagePlugin.PngImageFile)`
`236`	`237`	`assert im.bit_depth == expected_bit_depth`
`237`	`238`
`238`	`239`	`def test_load_transparent_p(self) -> None:`