FIX/TST: recursively remove ticks

Author: jklymak

lib/matplotlib/testing/decorators.py

@@ -111,7 +111,7 @@ def _checked_on_freetype_version(required_freetype_version):
 def remove_ticks_and_titles(figure):
     figure.suptitle("")
     null_formatter = ticker.NullFormatter()
-    for ax in figure.get_axes():
+    def remove_ticks(ax):
         ax.set_title("")
         ax.xaxis.set_major_formatter(null_formatter)
         ax.xaxis.set_minor_formatter(null_formatter)
@@ -122,6 +122,10 @@ def remove_ticks_and_titles(figure):
             ax.zaxis.set_minor_formatter(null_formatter)
         except AttributeError:
             pass
+        for child in ax.child_axes:
+            remove_ticks(child)
+    for ax in figure.get_axes():
+        remove_ticks(ax)
 
 
 def _raise_on_image_difference(expected, actual, tol):