added integration test for villas-pipe doing a simple loopback

tests/integration/pipe-loopback.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+CONFIG_FILE=$(mktemp)
+INPUT_FILE=$(mktemp)
+OUTPUT_FILE=$(mktemp)
+
+cat > ${CONFIG_FILE} <<- EOF
+nodes = {
+	node1 = {
+		type = "socket";
+		layer = "udp";
+		
+		local = "*:12000";
+		remote = "127.0.0.1:12000"
+	}
+}
+EOF
+
+# Generate test data
+villas-signal random -l 10 -n > ${INPUT_FILE}
+
+# We delay EOF of the INPUT_FILE by 1 second in order to wait for incoming data to be received
+villas-pipe ${CONFIG_FILE} node1 > ${OUTPUT_FILE} < <(cat ${INPUT_FILE}; sleep 1; echo -n)
+
+# Comapre data
+villas-test-cmp ${INPUT_FILE} ${OUTPUT_FILE}
+RC=$?
+
+rm ${OUTPUT_FILE} ${INPUT_FILE} ${CONFIG_FILE}
+
+exit $RC