plot_utils: let plot_temperature plot multiple input data
diff --git a/tests/test_plot_utils.py b/tests/test_plot_utils.py
index 8b11176..3f8fb19 100644
--- a/tests/test_plot_utils.py
+++ b/tests/test_plot_utils.py
@@ -101,8 +101,9 @@
 
         thrm = cr2.Thermal()
         gov = cr2.ThermalGovernor()
+        data = {"first": [thrm, gov], "second": [thrm, gov]}
 
-        plot_utils.plot_temperature(thrm, gov, title="Foo")
+        plot_utils.plot_temperature(data, ylim="default")
         matplotlib.pyplot.close('all')
 
     def test_plot_power_hists(self):