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Improve PaletteFile coverage #9396

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Improve PaletteFile coverage #9396

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16 changes: 15 additions & 1 deletion Tests/test_imagepalette.py
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Original file line number Diff line number Diff line change
@@ -1,10 +1,11 @@
from __future__ import annotations

from io import BytesIO
from pathlib import Path

import pytest

from PIL import Image, ImagePalette
from PIL import Image, ImagePalette, PaletteFile

from .helper import assert_image_equal, assert_image_equal_tofile

Expand Down Expand Up @@ -202,6 +203,19 @@ def test_2bit_palette(tmp_path: Path) -> None:
assert_image_equal_tofile(img, outfile)


def test_getpalette() -> None:
b = BytesIO(b"0 1\n1 2 3 4")
p = PaletteFile.PaletteFile(b)

palette, rawmode = p.getpalette()
assert palette[:6] == b"\x01\x01\x01\x02\x03\x04"
assert rawmode == "RGB"


def test_invalid_palette() -> None:
with pytest.raises(OSError):
ImagePalette.load("Tests/images/hopper.jpg")

b = BytesIO(b"1" * 101)
with pytest.raises(SyntaxError, match="bad palette file"):
PaletteFile.PaletteFile(b)
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