Add test for `plot_eddy_contours.py`

Inst_eddies/Analysis/tests.json

@@ -70,5 +70,16 @@
 	    ["$src_dir/Inst_eddies/Tests/Input/h_region_4.nc", "h.nc"],
 	    ["$src_dir/Inst_eddies/Tests/Input/uv_region_4.nc", "uv.nc"]
 	]
+    },
+    {
+	"title": "Plot_eddy_contours_2",
+	"command":
+	[
+	    "$src_dir/Inst_eddies/Analysis/plot_eddy_contours.py",
+	    "$tests_old_dir/Extraction_eddies_region_4/SHPC_anti",
+	    "$tests_old_dir/Extraction_eddies_region_4/SHPC_cyclo",
+	    "--save=png"
+	],
+	"description": "With two SHPC as command line arguments."
     }
 ]