Add test `Extract_component_CSV`

Overlap/Tests/short_tests.json

@@ -642,5 +642,15 @@
 	    "$my_data_dir/Eurec4A/Graph_anti/segments_cost.gt",
 	    "1980897", "component_1980897.graphml"
 	]
+    },
+    "Extract_component_CSV":
+    {
+	"description": "Extract component from an edgelist.",
+	"command":
+	[
+	    "$src_dir/Overlap/extract_component.py",
+	    "$my_data_dir/Eurec4A/Graph_anti/edgelist.csv",
+	    "1980897", "component_1980897.graphml"
+	]
     }
 }