Pillow/Tests/test_imagestat.py

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from __future__ import annotations
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import pytest
from PIL import Image, ImageStat
from .helper import hopper
def test_sanity() -> None:
im = hopper()
st = ImageStat.Stat(im)
st = ImageStat.Stat(im.histogram())
st = ImageStat.Stat(im, Image.new("1", im.size, 1))
# Check these run. Exceptions will cause failures.
st.extrema
st.sum
st.mean
st.median
st.rms
st.sum2
st.var
st.stddev
with pytest.raises(AttributeError):
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st.spam() # type: ignore[attr-defined]
with pytest.raises(TypeError):
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ImageStat.Stat(1) # type: ignore[arg-type]
def test_hopper() -> None:
im = hopper()
st = ImageStat.Stat(im)
# verify a few values
assert st.extrema[0] == (0, 255)
assert st.median[0] == 72
assert st.sum[0] == 1470218
assert st.sum[1] == 1311896
assert st.sum[2] == 1563008
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def test_constant() -> None:
im = Image.new("L", (128, 128), 128)
st = ImageStat.Stat(im)
assert st.extrema[0] == (128, 128)
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assert st.sum[0] == 128**3
assert st.sum2[0] == 128**4
assert st.mean[0] == 128
assert st.median[0] == 128
assert st.rms[0] == 128
assert st.var[0] == 0
assert st.stddev[0] == 0