@@ -4955,6 +4955,8 @@ def test_twin_moved(twin):
     ax.set_position([0.2, 0.2, 0.5, 0.5])
     # test twinx or twiny
     ax_twin = getattr(ax, 'twin{}'.format(twin))()
+    fig.draw_without_rendering()
+
     assert_array_equal(ax.bbox.extents,
                        ax_twin.bbox.extents)