Try removing decoder from IQ tests and changing writing method

client.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"encoding/xml"
 	"errors"
-	"fmt"
 	"io"
 	"net"
 	"time"
@@ -200,7 +199,7 @@ func (c *Client) Resume(state SMState) error {
 	//fmt.Fprintf(client.conn, "<presence xml:lang='en'><show>%s</show><status>%s</status></presence>", "chat", "Online")
 	// TODO: Do we always want to send initial presence automatically ?
 	// Do we need an option to avoid that or do we rely on client to send the presence itself ?
-	_, err = fmt.Fprintf(c.transport, "<presence/>")
+	err = c.sendWithWriter(c.transport, []byte("<presence/>"))
 
 	return err
 }

component.go

@@ -85,7 +85,7 @@ func (c *Component) Resume(sm SMState) error {
 	c.updateState(StateConnected)
 
 	// Authentication
-	if _, err := fmt.Fprintf(c.transport, "<handshake>%s</handshake>", c.handshake(streamId)); err != nil {
+	if err := c.sendWithWriter(c.transport, []byte(fmt.Sprintf("<handshake>%s</handshake>", c.handshake(streamId)))); err != nil {
 		c.updateState(StateStreamError)
 
 		return NewConnError(errors.New("cannot send handshake "+err.Error()), false)
@@ -159,12 +159,18 @@ func (c *Component) Send(packet stanza.Packet) error {
 		return errors.New("cannot marshal packet " + err.Error())
 	}
 
-	if _, err := fmt.Fprintf(transport, string(data)); err != nil {
+	if err := c.sendWithWriter(transport, data); err != nil {
 		return errors.New("cannot send packet " + err.Error())
 	}
 	return nil
 }
 
+func (c *Component) sendWithWriter(writer io.Writer, packet []byte) error {
+	var err error
+	_, err = writer.Write(packet)
+	return err
+}
+
 // SendIQ sends an IQ set or get stanza to the server. If a result is received
 // the provided handler function will automatically be called.
 //
@@ -195,7 +201,7 @@ func (c *Component) SendRaw(packet string) error {
 	}
 
 	var err error
-	_, err = fmt.Fprintf(transport, packet)
+	err = c.sendWithWriter(transport, []byte(packet))
 	return err
 }
 

tcp_server_mock.go

@@ -117,21 +117,25 @@ func (mock *ServerMock) loop() {
 //======================================================================================================================
 
 func respondToIQ(t *testing.T, c net.Conn) {
-	// Decoder to parse the request
-	decoder := xml.NewDecoder(c)
-
-	iqReq, err := receiveIq(c, decoder)
+	recvBuf := make([]byte, 1024)
+	var iqR stanza.IQ
+	_, err := c.Read(recvBuf[:]) // recv data
 	if err != nil {
-		t.Fatalf("failed to receive IQ : %s", err.Error())
+		if netErr, ok := err.(net.Error); ok && netErr.Timeout() {
+			t.Errorf("read timeout: %s", err)
+		} else {
+			t.Errorf("read error: %s", err)
+		}
 	}
+	xml.Unmarshal(recvBuf, &iqR)
 
-	if !iqReq.IsValid() {
+	if !iqR.IsValid() {
 		mockIQError(c)
 		return
 	}
 
 	// Crafting response
-	iqResp := stanza.NewIQ(stanza.Attrs{Type: stanza.IQTypeResult, From: iqReq.To, To: iqReq.From, Id: iqReq.Id, Lang: "en"})
+	iqResp := stanza.NewIQ(stanza.Attrs{Type: stanza.IQTypeResult, From: iqR.To, To: iqR.From, Id: iqR.Id, Lang: "en"})
 	disco := iqResp.DiscoInfo()
 	disco.AddFeatures("vcard-temp",
 		`http://jabber.org/protocol/address`)