MQTT output unit tests w/ docker container

Makefile

@@ -56,6 +56,7 @@ endif
 	docker run --name redis -p "6379:6379" -d redis
 	docker run --name aerospike -p "3000:3000" -d aerospike
 	docker run --name nsq -p "4150:4150" -d nsqio/nsq /nsqd
+	docker run --name mqtt -p "1883:1883" -d ncarlier/mqtt
 
 # Run docker containers necessary for CircleCI unit tests
 docker-run-circle:
@@ -67,11 +68,12 @@ docker-run-circle:
 	docker run --name opentsdb -p "4242:4242" -d petergrace/opentsdb-docker
 	docker run --name aerospike -p "3000:3000" -d aerospike
 	docker run --name nsq -p "4150:4150" -d nsqio/nsq /nsqd
+	docker run --name mqtt -p "1883:1883" -d ncarlier/mqtt
 
 # Kill all docker containers, ignore errors
 docker-kill:
-	-docker kill nsq aerospike redis opentsdb rabbitmq postgres memcached mysql kafka
-	-docker rm nsq aerospike redis opentsdb rabbitmq postgres memcached mysql kafka
+	-docker kill nsq aerospike redis opentsdb rabbitmq postgres memcached mysql kafka mqtt
+	-docker rm nsq aerospike redis opentsdb rabbitmq postgres memcached mysql kafka mqtt
 
 # Run full unit tests using docker containers (includes setup and teardown)
 test: docker-kill prepare docker-run

outputs/mqtt/mqtt_test.go

@@ -0,0 +1,27 @@
+package mqtt
+
+import (
+	"testing"
+
+	"github.com/influxdb/telegraf/testutil"
+	"github.com/stretchr/testify/require"
+)
+
+func TestConnectAndWrite(t *testing.T) {
+	if testing.Short() {
+		t.Skip("Skipping integration test in short mode")
+	}
+
+	var url = testutil.GetLocalHost() + ":1883"
+	m := &MQTT{
+		Servers: []string{url},
+	}
+
+	// Verify that we can connect to the MQTT broker
+	err := m.Connect()
+	require.NoError(t, err)
+
+	// Verify that we can successfully write data to the mqtt broker
+	err = m.Write(testutil.MockBatchPoints().Points())
+	require.NoError(t, err)
+}