Test telnet package

stream/telnet/telnet.go

@@ -57,8 +57,7 @@ func Serve(config *Options) {
 				streamID := ""
 				// Request for stream ID
 				for {
-					_, _ = s.Write([]byte("[GHOSTREAM]\n"))
-					_, err = s.Write([]byte("Enter stream ID: "))
+					_, err = s.Write([]byte("[GHOSTREAM]\nEnter stream ID: "))
 					if err != nil {
 						log.Println("Error while requesting stream ID to telnet client")
 						_ = s.Close()

stream/telnet/telnet_test.go

@@ -1 +1,64 @@
 package telnet
+
+import (
+	"bytes"
+	"io/ioutil"
+	"math/rand"
+	"net"
+	"testing"
+)
+
+// TestTelnetOutput creates a TCP client that connects to the server and get one image.
+func TestTelnetOutput(t *testing.T) {
+	// Enable and start Telnet server
+	Serve(&Options{
+		Enabled:       true,
+		ListenAddress: "127.0.0.1:8023",
+		Width:         80,
+		Height:        45,
+		Delay:         50,
+	})
+
+	// Generate a random image, that should be given by FFMPEG
+	sampleImage := make([]byte, Cfg.Width*Cfg.Height)
+	rand.Read(sampleImage)
+	reader := ioutil.NopCloser(bytes.NewBuffer(sampleImage))
+	// Send the image to the server
+	StartASCIIArtStream("demo", reader)
+
+	// Connect to the Telnet server
+	client, err := net.Dial("tcp", Cfg.ListenAddress)
+	if err != nil {
+		t.Fatalf("Error while connecting to the TCP server: %s", err)
+	}
+
+	// Create a sufficient large buffer
+	buff := make([]byte, 3*len(sampleImage))
+
+	// Read the input, and ensure that it is correct
+	// [GHOSTREAM]
+	// Enter stream ID:
+	n, err := client.Read(buff)
+	if err != nil {
+		t.Fatalf("Error while reading from TCP: %s", err)
+	}
+	if n != len("[GHOSTREAM]\nEnter stream ID: ") {
+		t.Fatalf("Read %d bytes from TCP, expected %d, read: %s", n, len("[GHOSTREAM]\nEnter stream ID: "), buff[:n])
+	}
+
+	// Send stream ID
+	_, err = client.Write([]byte("demo"))
+	if err != nil {
+		t.Fatalf("Error while writing from TCP: %s", err)
+	}
+
+	// Read the generated image
+	n, err = client.Read(buff)
+	if err != nil {
+		t.Fatalf("Error while reading the image from TCP: %s", err)
+	}
+	// Ensure that the size of the image is correct
+	if n != 42+(2*Cfg.Width+1)*Cfg.Height {
+		t.Fatalf("Read %d from TCP, expected %d", n, 42+(2*Cfg.Width+1)*Cfg.Height)
+	}
+}