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Doc: clarify preferred image comparison test settings by oscargus · Pull Request #24669 · matplotlib/matplotlib · GitHub

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Doc: clarify preferred image comparison test settings #24669

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tacaswell merged 1 commit into from
Dec 8, 2022
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Doc: clarify preferred image comparison test settings #24669

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8 changes: 7 additions & 1 deletion doc/devel/testing.rst
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Expand Up @@ -109,7 +109,7 @@ tests it::
import matplotlib.pyplot as plt

@image_comparison(baseline_images=['line_dashes'], remove_text=True,
extensions=['png'])
extensions=['png'], style='mpl20')
def test_line_dashes():
fig, ax = plt.subplots()
ax.plot(range(10), linestyle=(0, (3, 3)), lw=5)
Expand All @@ -130,6 +130,12 @@ images on the figures using two different methods (the tested method and the
baseline method). The decorator will arrange for setting up the figures and
then collect the drawn results and compare them.

It is preferred that new tests use ``style='mpl20'`` as this leads to smaller
figures and reflects the newer look of default Matplotlib plots. Also, if the
texts (labels, tick labels, etc) are not really part of what is tested, use
``remove_text=True`` as this will lead to smaller figures and reduce possible
issues with font mismatch on different platforms.

See the documentation of `~matplotlib.testing.decorators.image_comparison` and
`~matplotlib.testing.decorators.check_figures_equal` for additional information
about their use.
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