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Test GD transparency #9196

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Test GD transparency #9196

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10 changes: 10 additions & 0 deletions Tests/test_file_gd.py
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Original file line number Diff line number Diff line change
@@ -1,5 +1,7 @@
from __future__ import annotations

from io import BytesIO

import pytest

from PIL import GdImageFile, UnidentifiedImageError
Expand All @@ -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")
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