diff -r a01e06faf0db -r 4dabfef08c8c structs_test.go
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/structs_test.go	Sat Dec 24 09:55:26 2011 -0700
@@ -0,0 +1,50 @@
+// Copyright 2011 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package xmpp
+
+import (
+	"bytes"
+	"testing"
+	"xml"
+)
+
+func TestStreamMarshal(t *testing.T) {
+	s := &Stream{to: "bob"}
+	exp := `<stream:stream to="bob">`
+	assertMarshal(t, exp, s)
+
+	s = &Stream{to: "bob", from: "alice", id: "#3", version: "5.3"}
+	exp = `<stream:stream to="bob" from="alice" id="#3" version="5.3">`
+	assertMarshal(t, exp, s)
+
+	s = &Stream{lang: "en_US"}
+	exp = `<stream:stream xml:lang="en_US">`
+	assertMarshal(t, exp, s)
+}
+
+func TestStreamErrorMarshal(t *testing.T) {
+	name := xml.Name{Space: nsStreams, Local: "ack"}
+	e := &StreamError{cond: definedCondition{name}}
+	exp := `<stream:error><ack xmlns="` + nsStreams +
+		`"></ack></stream:error>`;
+	assertMarshal(t, exp, e)
+
+	txt := errText{Lang: "pt", text: "things happen"}
+	e = &StreamError{cond: definedCondition{name}, text: &txt}
+	exp = `<stream:error><ack xmlns="` + nsStreams +
+		`"></ack><text xmlns="` + nsStreams +
+		`" xml:lang="pt">things happen</text></stream:error>`
+	assertMarshal(t, exp, e)
+}
+
+func assertMarshal(t *testing.T, expected string, marshal interface{}) {
+	buf := bytes.NewBuffer(nil)
+	xml.Marshal(buf, marshal)
+	observed := string(buf.Bytes())
+	if expected != observed {
+		t.Errorf("Expected:\n%s\nObserved:\n%s\n", expected,
+			observed)
+	}
+}