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

aditya-singh597 · Aditya Singh · web-flow · commit 01fdf1bbd913 · 2026-02-02T12:05:12.000Z
* Add test for invalid property names passed to setp

* Fix blank line spacing for ruff

* Add tests for error handling in Artist.set

* Fix trailing whitespace in test_artist

---------

Co-authored-by: Aditya Singh &lt;adityasinghparmar60@gmail.com&gt;
diff --git a/lib/matplotlib/tests/test_artist.py b/lib/matplotlib/tests/test_artist.py
@@ -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)
