[testtools] Add utility method to generate fake mqtt message

testtools/testtools.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"github.com/cyrilix/robocar-base/mqttdevice"
+	mqtt "github.com/eclipse/paho.mqtt.golang"
 	"github.com/testcontainers/testcontainers-go"
 	"github.com/testcontainers/testcontainers-go/wait"
 	"sync"
@@ -58,3 +59,48 @@ func (f* FakePublisher) PublishedEvent(topic string) mqttdevice.MqttValue{
 	defer f.muMsg.Unlock()
 	return f.msg[topic]
 }
+
+type fakeMessage struct {
+	qos     byte
+	topic   string
+	payload []byte
+	acked   bool
+}
+
+func (f *fakeMessage) Duplicate() bool {
+	return false
+}
+
+func (f *fakeMessage) Qos() byte {
+	return f.qos
+}
+
+func (f *fakeMessage) Retained() bool {
+	return false
+}
+
+func (f *fakeMessage) Topic() string {
+	return f.topic
+}
+
+func (f *fakeMessage) MessageID() uint16 {
+	return 1234
+}
+
+func (f *fakeMessage) Payload() []byte {
+	return f.payload
+}
+
+func (f *fakeMessage) Ack() {
+	f.acked = true
+}
+
+func NewFakeMessage(topic string, payload []byte) mqtt.Message {
+	return &fakeMessage{
+		qos:     0,
+		topic:   topic,
+		payload: payload,
+		acked:   false,
+	}
+}
+