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Remove print() from test_agg_filter_alpha by iccir · Pull Request #32439 · matplotlib/matplotlib · GitHub

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Remove print() from test_agg_filter_alpha #32439

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Merged
timhoffm merged 2 commits into from
Oct 6, 2026
+7 −2
Conversation 6 Commits 2 Checks 43 Files changed 1
Merged

Remove print() from test_agg_filter_alpha #32439

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10ee5a4
Remove print() from test
iccir Oct 5, 2026
bc8465b
Add mock to ensure manual_alpha called
iccir Oct 5, 2026
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9 changes: 7 additions & 2 deletions lib/matplotlib/tests/test_agg_filter.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@

import matplotlib.pyplot as plt
from matplotlib.testing.decorators import image_comparison
from unittest.mock import Mock


@image_comparison(baseline_images=['agg_filter_alpha'],
Expand All @@ -14,17 +15,21 @@ def test_agg_filter_alpha():

def manual_alpha(im, dpi):
im[:, :, 3] *= 0.6
print('CALLED')
return im, 0, 0

wrapped_manual_alpha = Mock(wraps=manual_alpha)

# Note: Doing alpha like this is not the same as setting alpha on
# the mesh itself. Currently meshes are drawn as independent patches,
# and we see fine borders around the blocks of color. See the SO
# question for an example: https://stackoverflow.com/q/20678817/
mesh.set_agg_filter(manual_alpha)
mesh.set_agg_filter(wrapped_manual_alpha)

# Currently we must enable rasterization for this to have an effect in
# the PDF backend.
mesh.set_rasterized(True)

ax.plot([0, 4, 7], [1, 3, 8])
ax.figure.canvas.draw()

wrapped_manual_alpha.assert_called()
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