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hugovk merged 1 commit into from
Jul 11, 2025
+31 −1
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Improve ImageMath test coverage #9087

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32 changes: 31 additions & 1 deletion Tests/test_imagemath_lambda_eval.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,9 @@

from typing import Any

from PIL import Image, ImageMath
import pytest

from PIL import Image, ImageMath, _imagingmath


def pixel(im: Image.Image | int) -> str | int:
Expand Down Expand Up @@ -498,3 +500,31 @@ def test_logical_not_equal() -> None:
)
== "I 1"
)


def test_reflected_operands() -> None:
assert pixel(ImageMath.lambda_eval(lambda args: 1 + args["A"], **images)) == "I 2"
assert pixel(ImageMath.lambda_eval(lambda args: 1 - args["A"], **images)) == "I 0"
assert pixel(ImageMath.lambda_eval(lambda args: 1 * args["A"], **images)) == "I 1"
assert pixel(ImageMath.lambda_eval(lambda args: 1 / args["A"], **images)) == "I 1"
assert pixel(ImageMath.lambda_eval(lambda args: 1 % args["A"], **images)) == "I 0"
assert pixel(ImageMath.lambda_eval(lambda args: 1 ** args["A"], **images)) == "I 1"
assert pixel(ImageMath.lambda_eval(lambda args: 1 & args["A"], **images)) == "I 1"
assert pixel(ImageMath.lambda_eval(lambda args: 1 | args["A"], **images)) == "I 1"
assert pixel(ImageMath.lambda_eval(lambda args: 1 ^ args["A"], **images)) == "I 0"


def test_unsupported_mode() -> None:
im = Image.new("RGB", (1, 1))
with pytest.raises(ValueError, match="unsupported mode: RGB"):
ImageMath.lambda_eval(lambda args: args["im"] + 1, im=im)


def test_bad_operand_type(monkeypatch: pytest.MonkeyPatch) -> None:
monkeypatch.delattr(_imagingmath, "abs_I")
with pytest.raises(TypeError, match="bad operand type for 'abs'"):
ImageMath.lambda_eval(lambda args: abs(args["I"]), I=I)

monkeypatch.delattr(_imagingmath, "max_F")
with pytest.raises(TypeError, match="bad operand type for 'max'"):
ImageMath.lambda_eval(lambda args: args["max"](args["I"], args["F"]), I=I, F=F)
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