[mqtt] Implements mqtt publish tooling

testtools/testtools.go

@@ -0,0 +1,37 @@
+package testtools
+
+import (
+	"context"
+	"fmt"
+	"github.com/testcontainers/testcontainers-go"
+	"github.com/testcontainers/testcontainers-go/wait"
+	"testing"
+)
+
+func MqttContainer(t *testing.T) (context.Context, testcontainers.Container, string) {
+	ctx := context.Background()
+	req := testcontainers.ContainerRequest{
+		Image:        "eclipse-mosquitto",
+		ExposedPorts: []string{"1883/tcp"},
+		WaitingFor:   wait.ForLog("listen socket on port 1883."),
+	}
+	mqttC, err := testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{
+		ContainerRequest: req,
+		Started:          true,
+	})
+	if err != nil {
+		t.Error(err)
+	}
+
+	ip, err := mqttC.Host(ctx)
+	if err != nil {
+		t.Error(err)
+	}
+	port, err := mqttC.MappedPort(ctx, "1883/tcp")
+	if err != nil {
+		t.Error(err)
+	}
+
+	mqttUri := fmt.Sprintf("tcp://%s:%d", ip, port.Int())
+	return ctx, mqttC, mqttUri
+}