Fix SIGSEGV in xmpp_component (#126)

* SIGSEGV in xmpp_component example with Prosody #126

component_test.go

@@ -1,9 +1,13 @@
 package xmpp
 
 import (
+	"fmt"
 	"testing"
 )
 
+const testComponentDomain = "localhost"
+const testComponentPort = "15222"
+
 func TestHandshake(t *testing.T) {
 	opts := ComponentOptions{
 		Domain: "test.localhost",
@@ -30,3 +34,41 @@ func TestGenerateHandshake(t *testing.T) {
 func TestStreamManager(t *testing.T) {
 	NewStreamManager(&Component{}, nil)
 }
+
+// Tests that the decoder is properly initialized when connecting a component to a server.
+// The decoder is expected to be built after a valid connection
+// Based on the xmpp_component example.
+func TestDecoder(t *testing.T) {
+	testComponentAddess := fmt.Sprintf("%s:%s", testComponentDomain, testComponentPort)
+	mock := ServerMock{}
+	mock.Start(t, testComponentAddess, handlerConnectSuccess)
+
+	opts := ComponentOptions{
+		TransportConfiguration: TransportConfiguration{
+			Address: testComponentAddess,
+			Domain:  "localhost",
+		},
+		Domain:   testComponentDomain,
+		Secret:   "mypass",
+		Name:     "Test Component",
+		Category: "gateway",
+		Type:     "service",
+	}
+	router := NewRouter()
+	c, err := NewComponent(opts, router)
+	if err != nil {
+		t.Errorf("%+v", err)
+	}
+	c.transport, err = NewComponentTransport(c.ComponentOptions.TransportConfiguration)
+	if err != nil {
+		t.Errorf("%+v", err)
+	}
+	_, err = c.transport.Connect()
+	if err != nil {
+		t.Errorf("%+v", err)
+	}
+	if c.transport.GetDecoder() == nil {
+		t.Errorf("Failed to initialize decoder. Decoder is nil.")
+	}
+
+}