added integration test for a combo of villas-node and villas-pipe performing a loopback

tests/integration/node-loopback.sh

@@ -0,0 +1,65 @@
+#!/bin/bash
+
+CONFIG_FILE=$(mktemp)
+INPUT_FILE=$(mktemp)
+OUTPUT_FILE=$(mktemp)
+
+function prefix() {
+	case $1 in
+		node) P=$'\\\e[36mnode\\\e[39m: ' ;;
+		pipe) P=$'\\\e[93mpipe\\\e[39m: ' ;;
+		cmp)  P=$'\\\e[35mcmp\\\e[39m:  ' ;;
+	esac
+	
+	sed -e "s/^/$P/"
+}
+
+cat > ${CONFIG_FILE} <<EOF
+nodes = {
+	node1 = {
+		type = "socket";
+		layer = "udp";
+
+		local = "*:12000";
+		remote = "127.0.0.1:12001"
+	}
+	
+	node2 = {
+		type = "socket";
+		layer = "udp";
+
+		local = "*:12001";
+		remote = "127.0.0.1:12000"
+	}
+}
+
+paths = (
+	{
+		in  = "node1",
+		out = "node1"
+	}
+)
+EOF
+
+# Generate test data
+villas-signal random -l 10 -n > ${INPUT_FILE}
+
+# Start node
+villas-node ${CONFIG_FILE} 2>&1 | prefix node &
+
+# Wait for node to complete init
+sleep 1
+
+# Send / Receive data to node
+(villas-pipe ${CONFIG_FILE} node2 > ${OUTPUT_FILE} < <(cat ${INPUT_FILE}; sleep 1; echo -n)) 2>&1 | prefix pipe
+
+# Stop node
+kill %1
+
+# Compare data
+villas-test-cmp ${INPUT_FILE} ${OUTPUT_FILE} 2>&1 | prefix cmp
+RC=${PIPESTATUS[0]}
+
+rm ${CONFIG_FILE} ${INPUT_FILE} ${OUTPUT_FILE}
+
+exit $RC