TST: add test that CL works after manually setting the parallel position

Author: jklymak

lib/matplotlib/tests/test_constrainedlayout.py

@@ -537,3 +537,26 @@ def test_align_labels():
                                after_align[1].x0, rtol=0, atol=1e-05)
     # ensure labels do not go off the edge
     assert after_align[0].x0 >= 1
+
+
+def test_suplabels():
+    fig, ax = plt.subplots(constrained_layout=True)
+    fig.draw_no_output()
+    pos0 = ax.get_tightbbox(fig.canvas.get_renderer())
+    fig.supxlabel('Boo')
+    fig.supylabel('Booy')
+    fig.draw_no_output()
+    pos = ax.get_tightbbox(fig.canvas.get_renderer())
+    assert pos.y0 > pos0.y0 + 10.0
+    assert pos.x0 > pos0.x0 + 10.0
+
+    fig, ax = plt.subplots(constrained_layout=True)
+    fig.draw_no_output()
+    pos0 = ax.get_tightbbox(fig.canvas.get_renderer())
+    # check that specifying x (y) doesn't ruin the layout
+    fig.supxlabel('Boo', x=0.5)
+    fig.supylabel('Boo', y=0.5)
+    fig.draw_no_output()
+    pos = ax.get_tightbbox(fig.canvas.get_renderer())
+    assert pos.y0 > pos0.y0 + 10.0
+    assert pos.x0 > pos0.x0 + 10.0