Improved SunImagePlugin coverage

Tests/test_file_sun.py

@@ -1,10 +1,11 @@
 from __future__ import annotations
 
+import io
 import os
 
 import pytest
 
-from PIL import Image, SunImagePlugin
+from PIL import Image, SunImagePlugin, _binary
 
 from .helper import assert_image_equal_tofile, assert_image_similar, hopper
 
@@ -33,6 +34,60 @@
  assert_image_equal_tofile(im, "Tests/images/sunraster.im1.png")
 
 
+def _sun_header(
+ depth: int = 0, file_type: int = 0, palette_length: int = 0
+) -> io.BytesIO:
+ return io.BytesIO(
+ _binary.o32be(0x59A66A95)
+ + b"\x00" * 8
+ + _binary.o32be(depth)
+ + b"\x00" * 4
+ + _binary.o32be(file_type)
+ + b"\x00" * 4
+ + _binary.o32be(palette_length)
+ )
+
+
+def test_unsupported_mode_bit_depth() -> None:
+ with pytest.raises(SyntaxError, match="Unsupported Mode/Bit Depth"):
+ with SunImagePlugin.SunImageFile(_sun_header()):
+ pass
+
+
+def test_unsupported_color_palette_length() -> None:
+ with pytest.raises(SyntaxError, match="Unsupported Color Palette Length"):
+ with SunImagePlugin.SunImageFile(_sun_header(depth=1, palette_length=1025)):
+ pass
+
+
+def test_unsupported_palette_type() -> None:
+ with pytest.raises(SyntaxError, match="Unsupported Palette Type"):
+ with SunImagePlugin.SunImageFile(_sun_header(depth=1, palette_length=1)):
+ pass
+
+
+def test_unsupported_file_type() -> None:
+ with pytest.raises(SyntaxError, match="Unsupported Sun Raster file type"):
+ with SunImagePlugin.SunImageFile(_sun_header(depth=1, file_type=6)):
+ pass
+
+
+@pytest.mark.skipif(
+ not os.path.exists(EXTRA_DIR), reason="Extra image files not installed"
+)
+def test_rgbx() -> None:
+ with open(os.path.join(EXTRA_DIR, "32bpp.ras"), "rb") as fp:
+ data = fp.read()
+
+ # Set file type to 3
+ data = data[:20] + _binary.o32be(3) + data[24:]
+
+ with Image.open(io.BytesIO(data)) as im:
+ r, g, b = im.split()
+ im = Image.merge("RGB", (b, g, r))
+ assert_image_equal_tofile(im, os.path.join(EXTRA_DIR, "32bpp.png"))
+
+
 @pytest.mark.skipif(
  not os.path.exists(EXTRA_DIR), reason="Extra image files not installed"
 )