plot_utils: Make post_plot_setup() set the xlim
diff --git a/tests/test_plot_utils.py b/tests/test_plot_utils.py
index f09952c..d774118 100644
--- a/tests/test_plot_utils.py
+++ b/tests/test_plot_utils.py
@@ -28,6 +28,7 @@
         plot_utils.post_plot_setup(ax, title="Foo")
         plot_utils.post_plot_setup(ax, ylim=(0, 72))
         plot_utils.post_plot_setup(ax, xlabel="Bar")
+        plot_utils.post_plot_setup(ax, xlim=(0, 100))
 
 class TestPlotUtilsNeedTrace(TestThermalBase):
     def test_plot_allfreqs(self):