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Clarify JPEG tests for default/invalid subsampling

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-1 is the default; 3 is invalid and should behave the same as the default.
This commit is contained in:
Benjamin Gilbert 2023-12-04 06:12:29 -06:00
parent f90827dfc8
commit 14146732be
1 changed files with 4 additions and 6 deletions
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8
Tests/test_file_jpeg.py
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@ -434,7 +434,8 @@ class TestFileJpeg:
return layer[0][1:3] + layer[1][1:3] + layer[2][1:3]
# experimental API
im = self.roundtrip(hopper(), subsampling=-1) # default
for subsampling in (-1, 3): # (default, invalid)
im = self.roundtrip(hopper(), subsampling=subsampling)
assert getsampling(im) == (2, 2, 1, 1, 1, 1)
for subsampling in (0, "4:4:4"):
im = self.roundtrip(hopper(), subsampling=subsampling)
@ -446,11 +447,8 @@ class TestFileJpeg:
im = self.roundtrip(hopper(), subsampling=subsampling)
assert getsampling(im) == (2, 2, 1, 1, 1, 1)
im = self.roundtrip(hopper(), subsampling=3) # default (undefined)
assert getsampling(im) == (2, 2, 1, 1, 1, 1)
# RGB colorspace, no subsampling by default
im = self.roundtrip(hopper(), subsampling=3, keep_rgb=True)
im = self.roundtrip(hopper(), keep_rgb=True)
assert getsampling(im) == (1, 1, 1, 1, 1, 1)
with pytest.raises(TypeError):