Integration test for consul discovery service

Signed-off-by: Sriram Natarajan <natarajan.sriram@gmail.com>

test/integration/discovery-consul.bats

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+#!/usr/bin/env bats
+
+load helpers
+
+# Address on which Consul will listen (random port between 8000 and 9000).
+CONSUL_HOST=127.0.0.1:$(( ( RANDOM % 1000 )  + 8000 ))
+
+# Container name for integration test
+CONTAINER_NAME=swarm_consul
+
+function check_leader() {
+	# Confirm Cluster leader election
+	docker_host logs $CONTAINER_NAME | grep "New leader elected"
+	# Check member state
+	docker_host logs $CONTAINER_NAME | grep "consul: member '$CONTAINER_NAME' joined, marking health alive"
+}
+
+function start_consul() {
+	docker_host run --name=$CONTAINER_NAME -h $CONTAINER_NAME -p $CONSUL_HOST:8500 -d progrium/consul -server -bootstrap-expect 1 -data-dir /test
+	# Check if consul cluster leader is elected
+	retry 30 1 check_leader
+}
+
+function stop_consul() {
+	docker_host rm -f -v $CONTAINER_NAME
+}
+
+function setup() {
+	start_consul
+}
+
+function teardown() {
+	swarm_manage_cleanup
+	swarm_join_cleanup
+	stop_docker
+	stop_consul
+}
+
+@test "consul discovery" {
+	# Start 2 engines and make them join the cluster.
+	start_docker 2
+	swarm_join "consul://${CONSUL_HOST}/test"
+
+	# Start a manager and ensure it sees all the engines.
+	swarm_manage "consul://${CONSUL_HOST}/test"
+	check_swarm_nodes
+
+	# Add another engine to the cluster and make sure it's picked up by swarm.
+	start_docker 1
+	swarm_join "consul://${CONSUL_HOST}/test"
+	retry 30 1 check_swarm_nodes
+}