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Test GD transparency (#9196)

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Hugo van Kemenade 2025-10-10 12:59:22 +03:00 committed by GitHub
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Tests/test_file_gd.py
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@ -1,5 +1,7 @@
from __future__ import annotations
from io import BytesIO
import pytest
from PIL import GdImageFile, UnidentifiedImageError
@ -16,6 +18,14 @@ def test_sanity() -> None:
assert_image_similar_tofile(im.convert("RGB"), "Tests/images/hopper.jpg", 14)
def test_transparency() -> None:
with open(TEST_GD_FILE, "rb") as fp:
data = bytearray(fp.read())
data[7:11] = b"\x00\x00\x00\x05"
with GdImageFile.open(BytesIO(data)) as im:
assert im.info["transparency"] == 5
def test_bad_mode() -> None:
with pytest.raises(ValueError):
GdImageFile.open(TEST_GD_FILE, "bad mode")