Hello MQTT

go.mod

@@ -0,0 +1,3 @@
+module git.runcible.io/learning/learn_mqtt_go
+
+go 1.23.1

main.go

@@ -0,0 +1,15 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"os"
+)
+
+func printMessage(w io.Writer, msg string) {
+	fmt.Fprint(w, msg)
+}
+
+func main() {
+	printMessage(os.Stdout, "Hello MQTT\n")
+}

main_test.go

@@ -0,0 +1,17 @@
+package main
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestPrintMessage(t *testing.T) {
+	buffer := bytes.Buffer{}
+	printMessage(&buffer, "Hello MQTT\n")
+	got := buffer.String()
+	want := "Hello MQTT\n"
+
+	if got != want {
+		t.Errorf("Error. Got %s but wanted %s", got, want)
+	}
+}