plot_utils: Factor out plot_hist()
diff --git a/tests/test_plot_utils.py b/tests/test_plot_utils.py
index 31b7094..274ad97 100644
--- a/tests/test_plot_utils.py
+++ b/tests/test_plot_utils.py
@@ -1,5 +1,6 @@
 #!/usr/bin/python
 
+import pandas as pd
 import unittest
 
 from test_thermal import TestThermalBase
@@ -77,6 +78,12 @@
         plot_utils.post_plot_setup(ax, xlim=(0, 100))
         plot_utils.post_plot_setup(ax, xlim="default")
 
+    def test_plot_hist(self):
+        """Test that plost_hist doesn't bomb"""
+        data = pd.Series([1, 1, 2, 4])
+
+        plot_utils.plot_hist(data, "Foo", 20, "numbers", (0, 4), "default")
+
 class TestPlotUtilsNeedTrace(TestThermalBase):
     def test_plot_allfreqs(self):
         """Test that plot_allfreqs() doesn't bomb"""