plot_utils: create a plot_allfreqs that accepts multiple runs
diff --git a/tests/test_plot_utils.py b/tests/test_plot_utils.py
index 6b2ac8e..2f51cb2 100644
--- a/tests/test_plot_utils.py
+++ b/tests/test_plot_utils.py
@@ -124,3 +124,16 @@
 
         plot_utils.plot_load([run], self.map_label)
         matplotlib.pyplot.close('all')
+
+    def test_plot_allfreqs(self):
+        """Test that plot_utils.plot_allfreqs() doesn't bomb"""
+
+        run1 = cr2.Run(name="first")
+        run2 = cr2.Run(name="second")
+        runs = [run1, run2]
+
+        plot_utils.plot_allfreqs(runs, self.map_label, width=20)
+        matplotlib.pyplot.close('all')
+
+        plot_utils.plot_allfreqs([run1], self.map_label, width=20)
+        matplotlib.pyplot.close('all')