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73 lines
2.2 KiB
Python
73 lines
2.2 KiB
Python
from __future__ import annotations
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from io import BytesIO
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import pytest
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from PIL.GimpPaletteFile import GimpPaletteFile
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def test_sanity() -> None:
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with open("Tests/images/test.gpl", "rb") as fp:
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GimpPaletteFile(fp)
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with open("Tests/images/hopper.jpg", "rb") as fp:
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with pytest.raises(SyntaxError):
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GimpPaletteFile(fp)
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with open("Tests/images/bad_palette_file.gpl", "rb") as fp:
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with pytest.raises(SyntaxError, match="bad palette file"):
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GimpPaletteFile(fp)
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with open("Tests/images/bad_palette_entry.gpl", "rb") as fp:
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with pytest.raises(ValueError, match="bad palette entry"):
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GimpPaletteFile(fp)
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@pytest.mark.parametrize(
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"filename, size", (("custom_gimp_palette.gpl", 8), ("full_gimp_palette.gpl", 256))
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)
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def test_get_palette(filename: str, size: int) -> None:
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# Arrange
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with open("Tests/images/" + filename, "rb") as fp:
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palette_file = GimpPaletteFile(fp)
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# Act
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palette, mode = palette_file.getpalette()
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# Assert
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assert mode == "RGB"
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assert len(palette) / 3 == size
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def test_frombytes() -> None:
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# Test that __init__ stops reading after 260 lines
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with open("Tests/images/custom_gimp_palette.gpl", "rb") as fp:
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custom_data = fp.read()
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custom_data += b"#\n" * 300 + b" 0 0 0 Index 12"
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b = BytesIO(custom_data)
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palette = GimpPaletteFile(b)
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assert len(palette.palette) / 3 == 8
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# Test that __init__ only reads 256 entries
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with open("Tests/images/full_gimp_palette.gpl", "rb") as fp:
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full_data = fp.read()
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data = full_data.replace(b"#\n", b"") + b" 0 0 0 Index 256"
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b = BytesIO(data)
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palette = GimpPaletteFile(b)
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assert len(palette.palette) / 3 == 256
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# Test that frombytes() can read beyond that
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palette = GimpPaletteFile.frombytes(data)
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assert len(palette.palette) / 3 == 257
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# Test that __init__ raises an error if a comment is too long
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data = full_data[:-1] + b"a" * 100
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b = BytesIO(data)
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with pytest.raises(SyntaxError, match="bad palette file"):
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palette = GimpPaletteFile(b)
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# Test that frombytes() can read the data regardless
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palette = GimpPaletteFile.frombytes(data)
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assert len(palette.palette) / 3 == 256
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