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TST: Fix warnings from Pillow for unavailable features #31014

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Merged
timhoffm merged 1 commit into from
Jan 24, 2026
Merged

TST: Fix warnings from Pillow for unavailable features #31014

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16 changes: 12 additions & 4 deletions lib/matplotlib/tests/test_agg.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
import io
import warnings

import numpy as np
from numpy.testing import assert_array_almost_equal
Expand All @@ -17,6 +18,13 @@
from matplotlib.transforms import IdentityTransform


def require_pillow_feature(name):
with warnings.catch_warnings():
warnings.simplefilter('ignore')
available = features.check(name.lower())
return pytest.mark.skipif(not available, reason=f"{name} support not available")


def test_repeated_save_with_alpha():
# We want an image which has a background color of bluish green, with an
# alpha of 0.25.
Expand Down Expand Up @@ -249,7 +257,7 @@ def test_pil_kwargs_tiff():
assert tags["ImageDescription"] == "test image"


@pytest.mark.skipif(not features.check("webp"), reason="WebP support not available")
@require_pillow_feature('WebP')
def test_pil_kwargs_webp():
plt.plot([0, 1, 2], [0, 1, 0])
buf_small = io.BytesIO()
Expand All @@ -263,7 +271,7 @@ def test_pil_kwargs_webp():
assert buf_large.getbuffer().nbytes > buf_small.getbuffer().nbytes


@pytest.mark.skipif(not features.check("avif"), reason="AVIF support not available")
@require_pillow_feature('AVIF')
def test_pil_kwargs_avif():
plt.plot([0, 1, 2], [0, 1, 0])
buf_small = io.BytesIO()
Expand Down Expand Up @@ -295,7 +303,7 @@ def test_gif_alpha():
assert im.info["transparency"] < len(im.palette.colors)


@pytest.mark.skipif(not features.check("webp"), reason="WebP support not available")
@require_pillow_feature('WebP')
def test_webp_alpha():
plt.plot([0, 1, 2], [0, 1, 0])
buf = io.BytesIO()
Expand All @@ -304,7 +312,7 @@ def test_webp_alpha():
assert im.mode == "RGBA"


@pytest.mark.skipif(not features.check("avif"), reason="AVIF support not available")
@require_pillow_feature('AVIF')
def test_avif_alpha():
plt.plot([0, 1, 2], [0, 1, 0])
buf = io.BytesIO()
Expand Down
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