Fixed miss matching string on test_scatter_singular_plural_arguments,…

… add reset of linewidths and edgecolors after normalize_kwargs

lib/matplotlib/axes/_axes.py

@@ -4552,13 +4552,18 @@ def scatter(self, x, y, s=None, c=None, marker=None, cmap=None, norm=None,
           size matches the size of *x* and *y*.
 
         """
-
-        if edgecolors:
+        # add edgecolors and linewidths to kwargs so they
+        # can be processed by normailze_kwargs
+        if edgecolors is not None:
             kwargs.update({'edgecolors': edgecolors})
-        if linewidths:
+        if linewidths is not None:
             kwargs.update({'linewidths': linewidths})
 
         kwargs = cbook.normalize_kwargs(kwargs, mcoll.Collection)
+        # re direct linewidth and edgecolor so it can be
+        # further processed by the rest of the function
+        linewidths = kwargs.pop('linewidth', None)
+        edgecolors = kwargs.pop('edgecolor', None)
         # Process **kwargs to handle aliases, conflicts with explicit kwargs:
         x, y = self._process_unit_info([("x", x), ("y", y)], kwargs)
         # np.ma.ravel yields an ndarray, not a masked array,

lib/matplotlib/tests/test_axes.py

@@ -2708,19 +2708,19 @@ def test_scatter_singular_plural_arguments(self):
 
         with pytest.raises(TypeError,
                            match="Got both 'linewidth' and 'linewidths',\
-which are aliases of one another"):
+ which are aliases of one another"):
             plt.scatter([1, 2, 3], [1, 2, 3], linewidths=[0.5, 0.4, 0.3], linewidth=0.2)
 
         with pytest.raises(TypeError,
                            match="Got both 'edgecolor' and 'edgecolors',\
-which are aliases of one another"):
+ which are aliases of one another"):
             plt.scatter([1, 2, 3], [1, 2, 3],
                         edgecolors=["#ffffff", "#000000", "#f0f0f0"],
                           edgecolor="#ffffff")
 
         with pytest.raises(TypeError,
                            match="Got both 'facecolor' and 'facecolors',\
-which are aliases of one another"):
+ which are aliases of one another"):
             plt.scatter([1, 2, 3], [1, 2, 3],
                         facecolors=["#ffffff", "#000000", "#f0f0f0"],
                             facecolor="#ffffff")