Added test.

NGWi · NGWi · commit 49f03f723ebb · 2024-11-18T14:04:16.000-05:00
diff --git a/lib/matplotlib/tests/test_axes.py b/lib/matplotlib/tests/test_axes.py
@@ -2765,6 +2765,24 @@ def test_scatter_color_warning(self, kwargs):
         plt.scatter([], [], c=[], **kwargs)
         plt.scatter([1, 2], [3, 4], c=[4, 5], **kwargs)
 
+    @pytest.mark.parametrize('colors', 
+        [
+            ('red', 'blue'),                        # simple string colors
+            (['red', 'blue'], ['green', 'yellow']),      # array of colors
+            ([[1, 0, 0], [0, 1, 0]], [[0, 0, 1], [1, 1, 0]])  # RGB values
+        ])
+    def test_scatter_c_facecolor_warning(self, colors):
+        warn_match = (
+            "You passed both c and facecolor/facecolors for the markers. "
+            "c has precedence over facecolor/facecolors. This behavior may "
+            "change in the future."
+        )
+        fig, ax = plt.subplots()
+        x = [0, 1] if len(colors[0]) == 2 else [0]
+        y = x
+        with pytest.warns(UserWarning, match=warn_match):
+            ax.scatter(x, y, c=colors[0], facecolors=colors[1])
+        
     def test_scatter_unfilled(self):
         coll = plt.scatter([0, 1, 2], [1, 3, 2], c=['0.1', '0.3', '0.5'],
                            marker=mmarkers.MarkerStyle('o', fillstyle='none'),
