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Add tests for invalid properties and duplicate aliases in Artist.set #31041

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Merged
rcomer merged 4 commits into from
Feb 2, 2026
Merged

Add tests for invalid properties and duplicate aliases in Artist.set #31041

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4008630
Add test for invalid property names passed to setp
Jan 27, 2026
6333c04
Fix blank line spacing for ruff
Jan 27, 2026
99c36fd
Add tests for error handling in Artist.set
Jan 29, 2026
7ba8a79
Fix trailing whitespace in test_artist
Jan 30, 2026
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20 changes: 20 additions & 0 deletions lib/matplotlib/tests/test_artist.py
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Original file line number Diff line number Diff line change
Expand Up @@ -259,6 +259,26 @@ def test_setp():
assert sio.getvalue() == ' zorder: float\n'


def test_artist_set_invalid_property_raises():
"""
Test that set() raises AttributeError for invalid property names.
"""
line = mlines.Line2D([0, 1], [0, 1])

with pytest.raises(AttributeError, match="unexpected keyword argument"):
line.set(not_a_property=1)


def test_artist_set_duplicate_aliases_raises():
"""
Test that set() raises TypeError when both a property and its alias are provided.
"""
line = mlines.Line2D([0, 1], [0, 1])

with pytest.raises(TypeError, match="aliases of one another"):
line.set(lw=2, linewidth=3)


def test_None_zorder():
fig, ax = plt.subplots()
ln, = ax.plot(range(5), zorder=None)
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