TST: add a test

Author: jklymak

lib/mpl_toolkits/tests/test_mplot3d.py

@@ -1324,3 +1324,11 @@ def test_scalarmap_update(fig_test, fig_ref):
     # ref
     ax_ref = fig_ref.add_subplot(111, projection='3d')
     sc_ref = ax_ref.scatter(x, y, z, c=c, s=40, cmap='viridis')
+
+
+def test_subfigure_simple():
+    # smoketest that subfigures can work...
+    fig = plt.figure()
+    sf = fig.subfigures(1, 2)
+    ax = sf[0].add_subplot(1, 1, 1, projection='3d')
+    ax = sf[1].add_subplot(1, 1, 1, projection='3d', label='other')