fix failing test

Author: saranti

doc/users/next_whats_new/boxplot_legend_support.rst

@@ -3,7 +3,7 @@ Legend support for Boxplot
 Boxplots now support a *label* parameter to create legend entries.
 
 Legend labels can be passed as a list of strings to label multiple boxes in a single
-`.boxplot` call:
+`.Axes.boxplot` call:
 
 
 .. plot::
@@ -37,7 +37,7 @@ Legend labels can be passed as a list of strings to label multiple boxes in a si
     ax.legend()
 
 
-Or as a single string to each individual `.boxplot`:
+Or as a single string to each individual `.Axes.boxplot`:
 
 .. plot::
     :include-source: true

lib/matplotlib/tests/test_legend.py

@@ -1460,7 +1460,7 @@ def test_boxplot_legend_labels():
     assert all(isinstance(h, mpl.lines.Line2D) for h in handles)
 
     # Testing legend with number of labels different from number of boxes.
-    with pytest.raises(ValueError, match='There must be an equal number'):
+    with pytest.raises(ValueError, match='values must have same the length'):
         bp3 = axs[2].boxplot(data, label=legend_labels[:-1])
 
     # Test that for a string label, only the first box gets a label.