diff --git a/xarray/tests/test_plot.py b/xarray/tests/test_plot.py
index 58210e6ffa0..982d3cc1a73 100644
--- a/xarray/tests/test_plot.py
+++ b/xarray/tests/test_plot.py
@@ -265,6 +265,7 @@ def test2d_1d_2d_coordinates_contourf(self):
         )
 
         a.plot.contourf(x="time", y="depth")
+        a.plot.contourf(x="depth", y="time")
 
     def test3d(self):
         self.darray.plot()