Add test of `plot_eddy_contours.py`

Tests/short_tests.json

@@ -1100,5 +1100,13 @@
 	    "$src_dir/Analysis/mat_to_shapefiles.py",
 	    "$src_dir/Tests/Input/Eurec4A_OA/adt_2019-12-15_v6.mat"
 	]
+    },
+    {
+	"title": "Plot_eddy_contours",
+	"command":
+	[
+	    "$src_dir/Analysis/plot_eddy_contours.py",
+	    "$src_dir/Tests/Input/Region_6_SHP_triplet", "--save=png"
+	]
     }
 ]