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Fix tests on Python 3.15 #31784

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Merged
scottshambaugh merged 2 commits into from
Jun 2, 2026
Merged

Fix tests on Python 3.15 #31784

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43b7976
Fix test_RcParams_class on Python 3.15
QuLogic May 30, 2026
5c2dfa3
TST: Ignore a new fork deprecation warning in Python 3.15
frenzymadness May 30, 2026
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3 changes: 3 additions & 0 deletions lib/matplotlib/tests/test_font_manager.py
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Original file line number Diff line number Diff line change
Expand Up @@ -286,6 +286,9 @@ def _model_handler(_):
reason='emscripten does not support subprocesses')
@pytest.mark.skipif(not hasattr(os, "register_at_fork"),
reason="Cannot register at_fork handlers")
# Python 3.15+ raises DeprecationWarning for fork in multi-threaded process
@pytest.mark.filterwarnings("ignore:.*multi-threaded.*fork.*:DeprecationWarning")
@pytest.mark.filterwarnings("ignore:.*multi-threaded.*fork.*:RuntimeWarning")
def test_fork():
_model_handler(0) # Make sure the font cache is filled.
ctx = multiprocessing.get_context("fork")
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26 changes: 14 additions & 12 deletions lib/matplotlib/tests/test_rcparams.py
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Original file line number Diff line number Diff line change
Expand Up @@ -73,32 +73,34 @@ def func():


def test_RcParams_class():
rc = mpl.RcParams({'font.cursive': ['Apple Chancery',
'Textile',
'Zapf Chancery',
'cursive'],
rc = mpl.RcParams({'font.cursive': ['Zapf Chancery', 'cursive'],
'font.family': 'sans-serif',
'font.weight': 'normal',
'font.size': 12})

expected_repr = """
RcParams({'font.cursive': ['Apple Chancery',
'Textile',
'Zapf Chancery',
'cursive'],
RcParams({
'font.cursive': ['Zapf Chancery', 'cursive'],
'font.family': ['sans-serif'],
'font.size': 12.0,
'font.weight': 'normal'})""".lstrip()
'font.weight': 'normal',
})""".lstrip()

assert expected_repr == repr(rc)
actual_repr = repr(rc)
if sys.version_info[:2] < (3, 15):
actual_repr = (actual_repr
.replace("{'", "{\n '")
.replace("'}", "',\n }"))

assert actual_repr == expected_repr

expected_str = """
font.cursive: ['Apple Chancery', 'Textile', 'Zapf Chancery', 'cursive']
font.cursive: ['Zapf Chancery', 'cursive']
font.family: ['sans-serif']
font.size: 12.0
font.weight: normal""".lstrip()

assert expected_str == str(rc)
assert str(rc) == expected_str

# test the find_all functionality
assert ['font.cursive', 'font.size'] == sorted(rc.find_all('i[vz]'))
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