webdav/internal/xml/read_test.go - net - Git at Google

 // Copyright 2009 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 xml

 import (
 	"bytes"
 	"fmt"
 	"io"
 	"reflect"
 	"strings"
 	"testing"
 	"time"
 )

 // Stripped down Atom feed data structures.

 func TestUnmarshalFeed(t *testing.T) {
 	var f Feed
 	if err := Unmarshal([]byte(atomFeedString), &f); err != nil {
 		t.Fatalf("Unmarshal: %s", err)
 	}
 	if !reflect.DeepEqual(f, atomFeed) {
 		t.Fatalf("have %#v\nwant %#v", f, atomFeed)
 	}
 }

 // hget http://codereview.appspot.com/rss/mine/rsc
 const atomFeedString = `
 <?xml version="1.0" encoding="utf-8"?>
 <feed xmlns="http://www.w3.org/2005/Atom" xml:lang="en-us" updated="2009-10-04T01:35:58+00:00"><title>Code Review - My issues</title><link href="http://codereview.appspot.com/" rel="alternate"></link><link href="http://codereview.appspot.com/rss/mine/rsc" rel="self"></link><id>http://codereview.appspot.com/</id><author><name>rietveld&lt;&gt;</name></author><entry><title>rietveld: an attempt at pubsubhubbub
 </title><link href="http://codereview.appspot.com/126085" rel="alternate"></link><updated>2009-10-04T01:35:58+00:00</updated><author><name>email-address-removed</name></author><id>urn:md5:134d9179c41f806be79b3a5f7877d19a</id><summary type="html">
   An attempt at adding pubsubhubbub support to Rietveld.
 http://code.google.com/p/pubsubhubbub
 http://code.google.com/p/rietveld/issues/detail?id=155

 The server side of the protocol is trivial:
   1. add a &amp;lt;link rel=&amp;quot;hub&amp;quot; href=&amp;quot;hub-server&amp;quot;&amp;gt; tag to all
      feeds that will be pubsubhubbubbed.
   2. every time one of those feeds changes, tell the hub
      with a simple POST request.

 I have tested this by adding debug prints to a local hub
 server and checking that the server got the right publish
 requests.

 I can&amp;#39;t quite get the server to work, but I think the bug
 is not in my code.  I think that the server expects to be
 able to grab the feed and see the feed&amp;#39;s actual URL in
 the link rel=&amp;quot;self&amp;quot;, but the default value for that drops
 the :port from the URL, and I cannot for the life of me
 figure out how to get the Atom generator deep inside
 django not to do that, or even where it is doing that,
 or even what code is running to generate the Atom feed.
 (I thought I knew but I added some assert False statements
 and it kept running!)

 Ignoring that particular problem, I would appreciate
 feedback on the right way to get the two values at
 the top of feeds.py marked NOTE(rsc).


 </summary></entry><entry><title>rietveld: correct tab handling
 </title><link href="http://codereview.appspot.com/124106" rel="alternate"></link><updated>2009-10-03T23:02:17+00:00</updated><author><name>email-address-removed</name></author><id>urn:md5:0a2a4f19bb815101f0ba2904aed7c35a</id><summary type="html">
   This fixes the buggy tab rendering that can be seen at
 http://codereview.appspot.com/116075/diff/1/2

 The fundamental problem was that the tab code was
 not being told what column the text began in, so it
 didn&amp;#39;t know where to put the tab stops.  Another problem
 was that some of the code assumed that string byte
 offsets were the same as column offsets, which is only
 true if there are no tabs.

 In the process of fixing this, I cleaned up the arguments
 to Fold and ExpandTabs and renamed them Break and
 _ExpandTabs so that I could be sure that I found all the
 call sites.  I also wanted to verify that ExpandTabs was
 not being used from outside intra_region_diff.py.


 </summary></entry></feed> 	   `

 type Feed struct {
 	XMLName Name      `xml:"http://www.w3.org/2005/Atom feed"`
 	Title   string    `xml:"title"`
 	Id      string    `xml:"id"`
 	Link    []Link    `xml:"link"`
 	Updated time.Time `xml:"updated,attr"`
 	Author  Person    `xml:"author"`
 	Entry   []Entry   `xml:"entry"`
 }

 type Entry struct {
 	Title   string    `xml:"title"`
 	Id      string    `xml:"id"`
 	Link    []Link    `xml:"link"`
 	Updated time.Time `xml:"updated"`
 	Author  Person    `xml:"author"`
 	Summary Text      `xml:"summary"`
 }

 type Link struct {
 	Rel  string `xml:"rel,attr,omitempty"`
 	Href string `xml:"href,attr"`
 }

 type Person struct {
 	Name     string `xml:"name"`
 	URI      string `xml:"uri"`
 	Email    string `xml:"email"`
 	InnerXML string `xml:",innerxml"`
 }

 type Text struct {
 	Type string `xml:"type,attr,omitempty"`
 	Body string `xml:",chardata"`
 }

 var atomFeed = Feed{
 	XMLName: Name{"http://www.w3.org/2005/Atom", "feed"},
 	Title:   "Code Review - My issues",
 	Link: []Link{
 		{Rel: "alternate", Href: "http://codereview.appspot.com/"},
 		{Rel: "self", Href: "http://codereview.appspot.com/rss/mine/rsc"},
 	},
 	Id:      "http://codereview.appspot.com/",
 	Updated: ParseTime("2009-10-04T01:35:58+00:00"),
 	Author: Person{
 		Name:     "rietveld<>",
 		InnerXML: "<name>rietveld&lt;&gt;</name>",
 	},
 	Entry: []Entry{
 		{
 			Title: "rietveld: an attempt at pubsubhubbub\n",
 			Link: []Link{
 				{Rel: "alternate", Href: "http://codereview.appspot.com/126085"},
 			},
 			Updated: ParseTime("2009-10-04T01:35:58+00:00"),
 			Author: Person{
 				Name:     "email-address-removed",
 				InnerXML: "<name>email-address-removed</name>",
 			},
 			Id: "urn:md5:134d9179c41f806be79b3a5f7877d19a",
 			Summary: Text{
 				Type: "html",
 				Body: `
   An attempt at adding pubsubhubbub support to Rietveld.
 http://code.google.com/p/pubsubhubbub
 http://code.google.com/p/rietveld/issues/detail?id=155

 The server side of the protocol is trivial:
   1. add a &lt;link rel=&quot;hub&quot; href=&quot;hub-server&quot;&gt; tag to all
      feeds that will be pubsubhubbubbed.
   2. every time one of those feeds changes, tell the hub
      with a simple POST request.

 I have tested this by adding debug prints to a local hub
 server and checking that the server got the right publish
 requests.

 I can&#39;t quite get the server to work, but I think the bug
 is not in my code.  I think that the server expects to be
 able to grab the feed and see the feed&#39;s actual URL in
 the link rel=&quot;self&quot;, but the default value for that drops
 the :port from the URL, and I cannot for the life of me
 figure out how to get the Atom generator deep inside
 django not to do that, or even where it is doing that,
 or even what code is running to generate the Atom feed.
 (I thought I knew but I added some assert False statements
 and it kept running!)

 Ignoring that particular problem, I would appreciate
 feedback on the right way to get the two values at
 the top of feeds.py marked NOTE(rsc).


 `,
 			},
 		},
 		{
 			Title: "rietveld: correct tab handling\n",
 			Link: []Link{
 				{Rel: "alternate", Href: "http://codereview.appspot.com/124106"},
 			},
 			Updated: ParseTime("2009-10-03T23:02:17+00:00"),
 			Author: Person{
 				Name:     "email-address-removed",
 				InnerXML: "<name>email-address-removed</name>",
 			},
 			Id: "urn:md5:0a2a4f19bb815101f0ba2904aed7c35a",
 			Summary: Text{
 				Type: "html",
 				Body: `
   This fixes the buggy tab rendering that can be seen at
 http://codereview.appspot.com/116075/diff/1/2

 The fundamental problem was that the tab code was
 not being told what column the text began in, so it
 didn&#39;t know where to put the tab stops.  Another problem
 was that some of the code assumed that string byte
 offsets were the same as column offsets, which is only
 true if there are no tabs.

 In the process of fixing this, I cleaned up the arguments
 to Fold and ExpandTabs and renamed them Break and
 _ExpandTabs so that I could be sure that I found all the
 call sites.  I also wanted to verify that ExpandTabs was
 not being used from outside intra_region_diff.py.


 `,
 			},
 		},
 	},
 }

 const pathTestString = `
 <Result>
     <Before>1</Before>
     <Items>
         <Item1>
             <Value>A</Value>
         </Item1>
         <Item2>
             <Value>B</Value>
         </Item2>
         <Item1>
             <Value>C</Value>
             <Value>D</Value>
         </Item1>
         <_>
             <Value>E</Value>
         </_>
     </Items>
     <After>2</After>
 </Result>
 `

 type PathTestItem struct {
 	Value string
 }

 type PathTestA struct {
 	Items         []PathTestItem `xml:">Item1"`
 	Before, After string
 }

 type PathTestB struct {
 	Other         []PathTestItem `xml:"Items>Item1"`
 	Before, After string
 }

 type PathTestC struct {
 	Values1       []string `xml:"Items>Item1>Value"`
 	Values2       []string `xml:"Items>Item2>Value"`
 	Before, After string
 }

 type PathTestSet struct {
 	Item1 []PathTestItem
 }

 type PathTestD struct {
 	Other         PathTestSet `xml:"Items"`
 	Before, After string
 }

 type PathTestE struct {
 	Underline     string `xml:"Items>_>Value"`
 	Before, After string
 }

 var pathTests = []interface{}{
 	&PathTestA{Items: []PathTestItem{{"A"}, {"D"}}, Before: "1", After: "2"},
 	&PathTestB{Other: []PathTestItem{{"A"}, {"D"}}, Before: "1", After: "2"},
 	&PathTestC{Values1: []string{"A", "C", "D"}, Values2: []string{"B"}, Before: "1", After: "2"},
 	&PathTestD{Other: PathTestSet{Item1: []PathTestItem{{"A"}, {"D"}}}, Before: "1", After: "2"},
 	&PathTestE{Underline: "E", Before: "1", After: "2"},
 }

 func TestUnmarshalPaths(t *testing.T) {
 	for _, pt := range pathTests {
 		v := reflect.New(reflect.TypeOf(pt).Elem()).Interface()
 		if err := Unmarshal([]byte(pathTestString), v); err != nil {
 			t.Fatalf("Unmarshal: %s", err)
 		}
 		if !reflect.DeepEqual(v, pt) {
 			t.Fatalf("have %#v\nwant %#v", v, pt)
 		}
 	}
 }

 type BadPathTestA struct {
 	First  string `xml:"items>item1"`
 	Other  string `xml:"items>item2"`
 	Second string `xml:"items"`
 }

 type BadPathTestB struct {
 	Other  string `xml:"items>item2>value"`
 	First  string `xml:"items>item1"`
 	Second string `xml:"items>item1>value"`
 }

 type BadPathTestC struct {
 	First  string
 	Second string `xml:"First"`
 }

 type BadPathTestD struct {
 	BadPathEmbeddedA
 	BadPathEmbeddedB
 }

 type BadPathEmbeddedA struct {
 	First string
 }

 type BadPathEmbeddedB struct {
 	Second string `xml:"First"`
 }

 var badPathTests = []struct {
 	v, e interface{}
 }{
 	{&BadPathTestA{}, &TagPathError{reflect.TypeOf(BadPathTestA{}), "First", "items>item1", "Second", "items"}},
 	{&BadPathTestB{}, &TagPathError{reflect.TypeOf(BadPathTestB{}), "First", "items>item1", "Second", "items>item1>value"}},
 	{&BadPathTestC{}, &TagPathError{reflect.TypeOf(BadPathTestC{}), "First", "", "Second", "First"}},
 	{&BadPathTestD{}, &TagPathError{reflect.TypeOf(BadPathTestD{}), "First", "", "Second", "First"}},
 }

 func TestUnmarshalBadPaths(t *testing.T) {
 	for _, tt := range badPathTests {
 		err := Unmarshal([]byte(pathTestString), tt.v)
 		if !reflect.DeepEqual(err, tt.e) {
 			t.Fatalf("Unmarshal with %#v didn't fail properly:\nhave %#v,\nwant %#v", tt.v, err, tt.e)
 		}
 	}
 }

 const OK = "OK"
 const withoutNameTypeData = `
 <?xml version="1.0" charset="utf-8"?>
 <Test3 Attr="OK" />`

 type TestThree struct {
 	XMLName Name   `xml:"Test3"`
 	Attr    string `xml:",attr"`
 }

 func TestUnmarshalWithoutNameType(t *testing.T) {
 	var x TestThree
 	if err := Unmarshal([]byte(withoutNameTypeData), &x); err != nil {
 		t.Fatalf("Unmarshal: %s", err)
 	}
 	if x.Attr != OK {
 		t.Fatalf("have %v\nwant %v", x.Attr, OK)
 	}
 }

 func TestUnmarshalAttr(t *testing.T) {
 	type ParamVal struct {
 		Int int `xml:"int,attr"`
 	}

 	type ParamPtr struct {
 		Int *int `xml:"int,attr"`
 	}

 	type ParamStringPtr struct {
 		Int *string `xml:"int,attr"`
 	}

 	x := []byte(`<Param int="1" />`)

 	p1 := &ParamPtr{}
 	if err := Unmarshal(x, p1); err != nil {
 		t.Fatalf("Unmarshal: %s", err)
 	}
 	if p1.Int == nil {
 		t.Fatalf("Unmarshal failed in to *int field")
 	} else if *p1.Int != 1 {
 		t.Fatalf("Unmarshal with %s failed:\nhave %#v,\n want %#v", x, p1.Int, 1)
 	}

 	p2 := &ParamVal{}
 	if err := Unmarshal(x, p2); err != nil {
 		t.Fatalf("Unmarshal: %s", err)
 	}
 	if p2.Int != 1 {
 		t.Fatalf("Unmarshal with %s failed:\nhave %#v,\n want %#v", x, p2.Int, 1)
 	}

 	p3 := &ParamStringPtr{}
 	if err := Unmarshal(x, p3); err != nil {
 		t.Fatalf("Unmarshal: %s", err)
 	}
 	if p3.Int == nil {
 		t.Fatalf("Unmarshal failed in to *string field")
 	} else if *p3.Int != "1" {
 		t.Fatalf("Unmarshal with %s failed:\nhave %#v,\n want %#v", x, p3.Int, 1)
 	}
 }

 type Tables struct {
 	HTable string `xml:"http://www.w3.org/TR/html4/ table"`
 	FTable string `xml:"http://www.w3schools.com/furniture table"`
 }

 var tables = []struct {
 	xml string
 	tab Tables
 	ns  string
 }{
 	{
 		xml: `<Tables>` +
 			`<table xmlns="http://www.w3.org/TR/html4/">hello</table>` +
 			`<table xmlns="http://www.w3schools.com/furniture">world</table>` +
 			`</Tables>`,
 		tab: Tables{"hello", "world"},
 	},
 	{
 		xml: `<Tables>` +
 			`<table xmlns="http://www.w3schools.com/furniture">world</table>` +
 			`<table xmlns="http://www.w3.org/TR/html4/">hello</table>` +
 			`</Tables>`,
 		tab: Tables{"hello", "world"},
 	},
 	{
 		xml: `<Tables xmlns:f="http://www.w3schools.com/furniture" xmlns:h="http://www.w3.org/TR/html4/">` +
 			`<f:table>world</f:table>` +
 			`<h:table>hello</h:table>` +
 			`</Tables>`,
 		tab: Tables{"hello", "world"},
 	},
 	{
 		xml: `<Tables>` +
 			`<table>bogus</table>` +
 			`</Tables>`,
 		tab: Tables{},
 	},
 	{
 		xml: `<Tables>` +
 			`<table>only</table>` +
 			`</Tables>`,
 		tab: Tables{HTable: "only"},
 		ns:  "http://www.w3.org/TR/html4/",
 	},
 	{
 		xml: `<Tables>` +
 			`<table>only</table>` +
 			`</Tables>`,
 		tab: Tables{FTable: "only"},
 		ns:  "http://www.w3schools.com/furniture",
 	},
 	{
 		xml: `<Tables>` +
 			`<table>only</table>` +
 			`</Tables>`,
 		tab: Tables{},
 		ns:  "something else entirely",
 	},
 }

 func TestUnmarshalNS(t *testing.T) {
 	for i, tt := range tables {
 		var dst Tables
 		var err error
 		if tt.ns != "" {
 			d := NewDecoder(strings.NewReader(tt.xml))
 			d.DefaultSpace = tt.ns
 			err = d.Decode(&dst)
 		} else {
 			err = Unmarshal([]byte(tt.xml), &dst)
 		}
 		if err != nil {
 			t.Errorf("#%d: Unmarshal: %v", i, err)
 			continue
 		}
 		want := tt.tab
 		if dst != want {
 			t.Errorf("#%d: dst=%+v, want %+v", i, dst, want)
 		}
 	}
 }

 func TestRoundTrip(t *testing.T) {
 	// From issue 7535
 	const s = `<ex:element xmlns:ex="http://example.com/schema"></ex:element>`
 	in := bytes.NewBufferString(s)
 	for i := 0; i < 10; i++ {
 		out := &bytes.Buffer{}
 		d := NewDecoder(in)
 		e := NewEncoder(out)

 		for {
 			t, err := d.Token()
 			if err == io.EOF {
 				break
 			}
 			if err != nil {
 				fmt.Println("failed:", err)
 				return
 			}
 			e.EncodeToken(t)
 		}
 		e.Flush()
 		in = out
 	}
 	if got := in.String(); got != s {
 		t.Errorf("have: %q\nwant: %q\n", got, s)
 	}
 }

 func TestMarshalNS(t *testing.T) {
 	dst := Tables{"hello", "world"}
 	data, err := Marshal(&dst)
 	if err != nil {
 		t.Fatalf("Marshal: %v", err)
 	}
 	want := `<Tables><table xmlns="http://www.w3.org/TR/html4/">hello</table><table xmlns="http://www.w3schools.com/furniture">world</table></Tables>`
 	str := string(data)
 	if str != want {
 		t.Errorf("have: %q\nwant: %q\n", str, want)
 	}
 }

 type TableAttrs struct {
 	TAttr TAttr
 }

 type TAttr struct {
 	HTable string `xml:"http://www.w3.org/TR/html4/ table,attr"`
 	FTable string `xml:"http://www.w3schools.com/furniture table,attr"`
 	Lang   string `xml:"http://www.w3.org/XML/1998/namespace lang,attr,omitempty"`
 	Other1 string `xml:"http://golang.org/xml/ other,attr,omitempty"`
 	Other2 string `xml:"http://golang.org/xmlfoo/ other,attr,omitempty"`
 	Other3 string `xml:"http://golang.org/json/ other,attr,omitempty"`
 	Other4 string `xml:"http://golang.org/2/json/ other,attr,omitempty"`
 }

 var tableAttrs = []struct {
 	xml string
 	tab TableAttrs
 	ns  string
 }{
 	{
 		xml: `<TableAttrs xmlns:f="http://www.w3schools.com/furniture" xmlns:h="http://www.w3.org/TR/html4/"><TAttr ` +
 			`h:table="hello" f:table="world" ` +
 			`/></TableAttrs>`,
 		tab: TableAttrs{TAttr{HTable: "hello", FTable: "world"}},
 	},
 	{
 		xml: `<TableAttrs><TAttr xmlns:f="http://www.w3schools.com/furniture" xmlns:h="http://www.w3.org/TR/html4/" ` +
 			`h:table="hello" f:table="world" ` +
 			`/></TableAttrs>`,
 		tab: TableAttrs{TAttr{HTable: "hello", FTable: "world"}},
 	},
 	{
 		xml: `<TableAttrs><TAttr ` +
 			`h:table="hello" f:table="world" xmlns:f="http://www.w3schools.com/furniture" xmlns:h="http://www.w3.org/TR/html4/" ` +
 			`/></TableAttrs>`,
 		tab: TableAttrs{TAttr{HTable: "hello", FTable: "world"}},
 	},
 	{
 		// Default space does not apply to attribute names.
 		xml: `<TableAttrs xmlns="http://www.w3schools.com/furniture" xmlns:h="http://www.w3.org/TR/html4/"><TAttr ` +
 			`h:table="hello" table="world" ` +
 			`/></TableAttrs>`,
 		tab: TableAttrs{TAttr{HTable: "hello", FTable: ""}},
 	},
 	{
 		// Default space does not apply to attribute names.
 		xml: `<TableAttrs xmlns:f="http://www.w3schools.com/furniture"><TAttr xmlns="http://www.w3.org/TR/html4/" ` +
 			`table="hello" f:table="world" ` +
 			`/></TableAttrs>`,
 		tab: TableAttrs{TAttr{HTable: "", FTable: "world"}},
 	},
 	{
 		xml: `<TableAttrs><TAttr ` +
 			`table="bogus" ` +
 			`/></TableAttrs>`,
 		tab: TableAttrs{},
 	},
 	{
 		// Default space does not apply to attribute names.
 		xml: `<TableAttrs xmlns:h="http://www.w3.org/TR/html4/"><TAttr ` +
 			`h:table="hello" table="world" ` +
 			`/></TableAttrs>`,
 		tab: TableAttrs{TAttr{HTable: "hello", FTable: ""}},
 		ns:  "http://www.w3schools.com/furniture",
 	},
 	{
 		// Default space does not apply to attribute names.
 		xml: `<TableAttrs xmlns:f="http://www.w3schools.com/furniture"><TAttr ` +
 			`table="hello" f:table="world" ` +
 			`/></TableAttrs>`,
 		tab: TableAttrs{TAttr{HTable: "", FTable: "world"}},
 		ns:  "http://www.w3.org/TR/html4/",
 	},
 	{
 		xml: `<TableAttrs><TAttr ` +
 			`table="bogus" ` +
 			`/></TableAttrs>`,
 		tab: TableAttrs{},
 		ns:  "something else entirely",
 	},
 }

 func TestUnmarshalNSAttr(t *testing.T) {
 	for i, tt := range tableAttrs {
 		var dst TableAttrs
 		var err error
 		if tt.ns != "" {
 			d := NewDecoder(strings.NewReader(tt.xml))
 			d.DefaultSpace = tt.ns
 			err = d.Decode(&dst)
 		} else {
 			err = Unmarshal([]byte(tt.xml), &dst)
 		}
 		if err != nil {
 			t.Errorf("#%d: Unmarshal: %v", i, err)
 			continue
 		}
 		want := tt.tab
 		if dst != want {
 			t.Errorf("#%d: dst=%+v, want %+v", i, dst, want)
 		}
 	}
 }

 func TestMarshalNSAttr(t *testing.T) {
 	src := TableAttrs{TAttr{"hello", "world", "en_US", "other1", "other2", "other3", "other4"}}
 	data, err := Marshal(&src)
 	if err != nil {
 		t.Fatalf("Marshal: %v", err)
 	}
 	want := `<TableAttrs><TAttr xmlns:json_1="http://golang.org/2/json/" xmlns:json="http://golang.org/json/" xmlns:_xmlfoo="http://golang.org/xmlfoo/" xmlns:_xml="http://golang.org/xml/" xmlns:furniture="http://www.w3schools.com/furniture" xmlns:html4="http://www.w3.org/TR/html4/" html4:table="hello" furniture:table="world" xml:lang="en_US" _xml:other="other1" _xmlfoo:other="other2" json:other="other3" json_1:other="other4"></TAttr></TableAttrs>`
 	str := string(data)
 	if str != want {
 		t.Errorf("Marshal:\nhave: %#q\nwant: %#q\n", str, want)
 	}

 	var dst TableAttrs
 	if err := Unmarshal(data, &dst); err != nil {
 		t.Errorf("Unmarshal: %v", err)
 	}

 	if dst != src {
 		t.Errorf("Unmarshal = %q, want %q", dst, src)
 	}
 }

 type MyCharData struct {
 	body string
 }

 func (m *MyCharData) UnmarshalXML(d *Decoder, start StartElement) error {
 	for {
 		t, err := d.Token()
 		if err == io.EOF { // found end of element
 			break
 		}
 		if err != nil {
 			return err
 		}
 		if char, ok := t.(CharData); ok {
 			m.body += string(char)
 		}
 	}
 	return nil
 }

 var _ Unmarshaler = (*MyCharData)(nil)

 func (m *MyCharData) UnmarshalXMLAttr(attr Attr) error {
 	panic("must not call")
 }

 type MyAttr struct {
 	attr string
 }

 func (m *MyAttr) UnmarshalXMLAttr(attr Attr) error {
 	m.attr = attr.Value
 	return nil
 }

 var _ UnmarshalerAttr = (*MyAttr)(nil)

 type MyStruct struct {
 	Data *MyCharData
 	Attr *MyAttr `xml:",attr"`

 	Data2 MyCharData
 	Attr2 MyAttr `xml:",attr"`
 }

 func TestUnmarshaler(t *testing.T) {
 	xml := `<?xml version="1.0" encoding="utf-8"?>
 		<MyStruct Attr="attr1" Attr2="attr2">
 		<Data>hello <!-- comment -->world</Data>
 		<Data2>howdy <!-- comment -->world</Data2>
 		</MyStruct>
 	`

 	var m MyStruct
 	if err := Unmarshal([]byte(xml), &m); err != nil {
 		t.Fatal(err)
 	}

 	if m.Data == nil || m.Attr == nil || m.Data.body != "hello world" || m.Attr.attr != "attr1" || m.Data2.body != "howdy world" || m.Attr2.attr != "attr2" {
 		t.Errorf("m=%#+v\n", m)
 	}
 }

 type Pea struct {
 	Cotelydon string
 }

 type Pod struct {
 	Pea interface{} `xml:"Pea"`
 }

 // https://golang.org/issue/6836
 func TestUnmarshalIntoInterface(t *testing.T) {
 	pod := new(Pod)
 	pod.Pea = new(Pea)
 	xml := `<Pod><Pea><Cotelydon>Green stuff</Cotelydon></Pea></Pod>`
 	err := Unmarshal([]byte(xml), pod)
 	if err != nil {
 		t.Fatalf("failed to unmarshal %q: %v", xml, err)
 	}
 	pea, ok := pod.Pea.(*Pea)
 	if !ok {
 		t.Fatalf("unmarshalled into wrong type: have %T want *Pea", pod.Pea)
 	}
 	have, want := pea.Cotelydon, "Green stuff"
 	if have != want {
 		t.Errorf("failed to unmarshal into interface, have %q want %q", have, want)
 	}
 }
	// Copyright 2009 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 xml

	import (
	"bytes"
	"fmt"
	"io"
	"reflect"
	"strings"
	"testing"
	"time"
	)

	// Stripped down Atom feed data structures.

	func TestUnmarshalFeed(t *testing.T) {
	var f Feed
	if err := Unmarshal([]byte(atomFeedString), &f); err != nil {
	t.Fatalf("Unmarshal: %s", err)
	}
	if !reflect.DeepEqual(f, atomFeed) {
	t.Fatalf("have %#v\nwant %#v", f, atomFeed)
	}
	}

	// hget http://codereview.appspot.com/rss/mine/rsc
	const atomFeedString = `
	<?xml version="1.0" encoding="utf-8"?>
	<feed xmlns="http://www.w3.org/2005/Atom" xml:lang="en-us" updated="2009-10-04T01:35:58+00:00"><title>Code Review - My issues</title><link href="http://codereview.appspot.com/" rel="alternate"></link><link href="http://codereview.appspot.com/rss/mine/rsc" rel="self"></link><id>http://codereview.appspot.com/</id><author><name>rietveld<></name></author><entry><title>rietveld: an attempt at pubsubhubbub
	</title><link href="http://codereview.appspot.com/126085" rel="alternate"></link><updated>2009-10-04T01:35:58+00:00</updated><author><name>email-address-removed</name></author><id>urn:md5:134d9179c41f806be79b3a5f7877d19a</id><summary type="html">
	An attempt at adding pubsubhubbub support to Rietveld.
	http://code.google.com/p/pubsubhubbub
	http://code.google.com/p/rietveld/issues/detail?id=155

	The server side of the protocol is trivial:
	1. add a &lt;link rel=&quot;hub&quot; href=&quot;hub-server&quot;&gt; tag to all
	feeds that will be pubsubhubbubbed.
	2. every time one of those feeds changes, tell the hub
	with a simple POST request.

	I have tested this by adding debug prints to a local hub
	server and checking that the server got the right publish
	requests.

	I can&#39;t quite get the server to work, but I think the bug
	is not in my code. I think that the server expects to be
	able to grab the feed and see the feed&#39;s actual URL in
	the link rel=&quot;self&quot;, but the default value for that drops
	the :port from the URL, and I cannot for the life of me
	figure out how to get the Atom generator deep inside
	django not to do that, or even where it is doing that,
	or even what code is running to generate the Atom feed.
	(I thought I knew but I added some assert False statements
	and it kept running!)

	Ignoring that particular problem, I would appreciate
	feedback on the right way to get the two values at
	the top of feeds.py marked NOTE(rsc).


	</summary></entry><entry><title>rietveld: correct tab handling
	</title><link href="http://codereview.appspot.com/124106" rel="alternate"></link><updated>2009-10-03T23:02:17+00:00</updated><author><name>email-address-removed</name></author><id>urn:md5:0a2a4f19bb815101f0ba2904aed7c35a</id><summary type="html">
	This fixes the buggy tab rendering that can be seen at
	http://codereview.appspot.com/116075/diff/1/2

	The fundamental problem was that the tab code was
	not being told what column the text began in, so it
	didn&#39;t know where to put the tab stops. Another problem
	was that some of the code assumed that string byte
	offsets were the same as column offsets, which is only
	true if there are no tabs.

	In the process of fixing this, I cleaned up the arguments
	to Fold and ExpandTabs and renamed them Break and
	_ExpandTabs so that I could be sure that I found all the
	call sites. I also wanted to verify that ExpandTabs was
	not being used from outside intra_region_diff.py.


	</summary></entry></feed> `

	type Feed struct {
	XMLName Name `xml:"http://www.w3.org/2005/Atom feed"`
	Title string `xml:"title"`
	Id string `xml:"id"`
	Link []Link `xml:"link"`
	Updated time.Time `xml:"updated,attr"`
	Author Person `xml:"author"`
	Entry []Entry `xml:"entry"`
	}

	type Entry struct {
	Title string `xml:"title"`
	Id string `xml:"id"`
	Link []Link `xml:"link"`
	Updated time.Time `xml:"updated"`
	Author Person `xml:"author"`
	Summary Text `xml:"summary"`
	}

	type Link struct {
	Rel string `xml:"rel,attr,omitempty"`
	Href string `xml:"href,attr"`
	}

	type Person struct {
	Name string `xml:"name"`
	URI string `xml:"uri"`
	Email string `xml:"email"`
	InnerXML string `xml:",innerxml"`
	}

	type Text struct {
	Type string `xml:"type,attr,omitempty"`
	Body string `xml:",chardata"`
	}

	var atomFeed = Feed{
	XMLName: Name{"http://www.w3.org/2005/Atom", "feed"},
	Title: "Code Review - My issues",
	Link: []Link{
	{Rel: "alternate", Href: "http://codereview.appspot.com/"},
	{Rel: "self", Href: "http://codereview.appspot.com/rss/mine/rsc"},
	},
	Id: "http://codereview.appspot.com/",
	Updated: ParseTime("2009-10-04T01:35:58+00:00"),
	Author: Person{
	Name: "rietveld<>",
	InnerXML: "<name>rietveld<></name>",
	},
	Entry: []Entry{
	{
	Title: "rietveld: an attempt at pubsubhubbub\n",
	Link: []Link{
	{Rel: "alternate", Href: "http://codereview.appspot.com/126085"},
	},
	Updated: ParseTime("2009-10-04T01:35:58+00:00"),
	Author: Person{
	Name: "email-address-removed",
	InnerXML: "<name>email-address-removed</name>",
	},
	Id: "urn:md5:134d9179c41f806be79b3a5f7877d19a",
	Summary: Text{
	Type: "html",
	Body: `
	An attempt at adding pubsubhubbub support to Rietveld.
	http://code.google.com/p/pubsubhubbub
	http://code.google.com/p/rietveld/issues/detail?id=155

	The server side of the protocol is trivial:
	1. add a <link rel="hub" href="hub-server"> tag to all
	feeds that will be pubsubhubbubbed.
	2. every time one of those feeds changes, tell the hub
	with a simple POST request.

	I have tested this by adding debug prints to a local hub
	server and checking that the server got the right publish
	requests.

	I can't quite get the server to work, but I think the bug
	is not in my code. I think that the server expects to be
	able to grab the feed and see the feed's actual URL in
	the link rel="self", but the default value for that drops
	the :port from the URL, and I cannot for the life of me
	figure out how to get the Atom generator deep inside
	django not to do that, or even where it is doing that,
	or even what code is running to generate the Atom feed.
	(I thought I knew but I added some assert False statements
	and it kept running!)

	Ignoring that particular problem, I would appreciate
	feedback on the right way to get the two values at
	the top of feeds.py marked NOTE(rsc).


	`,
	},
	},
	{
	Title: "rietveld: correct tab handling\n",
	Link: []Link{
	{Rel: "alternate", Href: "http://codereview.appspot.com/124106"},
	},
	Updated: ParseTime("2009-10-03T23:02:17+00:00"),
	Author: Person{
	Name: "email-address-removed",
	InnerXML: "<name>email-address-removed</name>",
	},
	Id: "urn:md5:0a2a4f19bb815101f0ba2904aed7c35a",
	Summary: Text{
	Type: "html",
	Body: `
	This fixes the buggy tab rendering that can be seen at
	http://codereview.appspot.com/116075/diff/1/2

	The fundamental problem was that the tab code was
	not being told what column the text began in, so it
	didn't know where to put the tab stops. Another problem
	was that some of the code assumed that string byte
	offsets were the same as column offsets, which is only
	true if there are no tabs.

	In the process of fixing this, I cleaned up the arguments
	to Fold and ExpandTabs and renamed them Break and
	_ExpandTabs so that I could be sure that I found all the
	call sites. I also wanted to verify that ExpandTabs was
	not being used from outside intra_region_diff.py.


	`,
	},
	},
	},
	}

	const pathTestString = `
	<Result>
	<Before>1</Before>
	<Items>
	<Item1>
	<Value>A</Value>
	</Item1>
	<Item2>
	<Value>B</Value>
	</Item2>
	<Item1>
	<Value>C</Value>
	<Value>D</Value>
	</Item1>
	<_>
	<Value>E</Value>
	</_>
	</Items>
	<After>2</After>
	</Result>
	`

	type PathTestItem struct {
	Value string
	}

	type PathTestA struct {
	Items []PathTestItem `xml:">Item1"`
	Before, After string
	}

	type PathTestB struct {
	Other []PathTestItem `xml:"Items>Item1"`
	Before, After string
	}

	type PathTestC struct {
	Values1 []string `xml:"Items>Item1>Value"`
	Values2 []string `xml:"Items>Item2>Value"`
	Before, After string
	}

	type PathTestSet struct {
	Item1 []PathTestItem
	}

	type PathTestD struct {
	Other PathTestSet `xml:"Items"`
	Before, After string
	}

	type PathTestE struct {
	Underline string `xml:"Items>_>Value"`
	Before, After string
	}

	var pathTests = []interface{}{
	&PathTestA{Items: []PathTestItem{{"A"}, {"D"}}, Before: "1", After: "2"},
	&PathTestB{Other: []PathTestItem{{"A"}, {"D"}}, Before: "1", After: "2"},
	&PathTestC{Values1: []string{"A", "C", "D"}, Values2: []string{"B"}, Before: "1", After: "2"},
	&PathTestD{Other: PathTestSet{Item1: []PathTestItem{{"A"}, {"D"}}}, Before: "1", After: "2"},
	&PathTestE{Underline: "E", Before: "1", After: "2"},
	}

	func TestUnmarshalPaths(t *testing.T) {
	for _, pt := range pathTests {
	v := reflect.New(reflect.TypeOf(pt).Elem()).Interface()
	if err := Unmarshal([]byte(pathTestString), v); err != nil {
	t.Fatalf("Unmarshal: %s", err)
	}
	if !reflect.DeepEqual(v, pt) {
	t.Fatalf("have %#v\nwant %#v", v, pt)
	}
	}
	}

	type BadPathTestA struct {
	First string `xml:"items>item1"`
	Other string `xml:"items>item2"`
	Second string `xml:"items"`
	}

	type BadPathTestB struct {
	Other string `xml:"items>item2>value"`
	First string `xml:"items>item1"`
	Second string `xml:"items>item1>value"`
	}

	type BadPathTestC struct {
	First string
	Second string `xml:"First"`
	}

	type BadPathTestD struct {
	BadPathEmbeddedA
	BadPathEmbeddedB
	}

	type BadPathEmbeddedA struct {
	First string
	}

	type BadPathEmbeddedB struct {
	Second string `xml:"First"`
	}

	var badPathTests = []struct {
	v, e interface{}
	}{
	{&BadPathTestA{}, &TagPathError{reflect.TypeOf(BadPathTestA{}), "First", "items>item1", "Second", "items"}},
	{&BadPathTestB{}, &TagPathError{reflect.TypeOf(BadPathTestB{}), "First", "items>item1", "Second", "items>item1>value"}},
	{&BadPathTestC{}, &TagPathError{reflect.TypeOf(BadPathTestC{}), "First", "", "Second", "First"}},
	{&BadPathTestD{}, &TagPathError{reflect.TypeOf(BadPathTestD{}), "First", "", "Second", "First"}},
	}

	func TestUnmarshalBadPaths(t *testing.T) {
	for _, tt := range badPathTests {
	err := Unmarshal([]byte(pathTestString), tt.v)
	if !reflect.DeepEqual(err, tt.e) {
	t.Fatalf("Unmarshal with %#v didn't fail properly:\nhave %#v,\nwant %#v", tt.v, err, tt.e)
	}
	}
	}

	const OK = "OK"
	const withoutNameTypeData = `
	<?xml version="1.0" charset="utf-8"?>
	<Test3 Attr="OK" />`

	type TestThree struct {
	XMLName Name `xml:"Test3"`
	Attr string `xml:",attr"`
	}

	func TestUnmarshalWithoutNameType(t *testing.T) {
	var x TestThree
	if err := Unmarshal([]byte(withoutNameTypeData), &x); err != nil {
	t.Fatalf("Unmarshal: %s", err)
	}
	if x.Attr != OK {
	t.Fatalf("have %v\nwant %v", x.Attr, OK)
	}
	}

	func TestUnmarshalAttr(t *testing.T) {
	type ParamVal struct {
	Int int `xml:"int,attr"`
	}

	type ParamPtr struct {
	Int *int `xml:"int,attr"`
	}

	type ParamStringPtr struct {
	Int *string `xml:"int,attr"`
	}

	x := []byte(`<Param int="1" />`)

	p1 := &ParamPtr{}
	if err := Unmarshal(x, p1); err != nil {
	t.Fatalf("Unmarshal: %s", err)
	}
	if p1.Int == nil {
	t.Fatalf("Unmarshal failed in to *int field")
	} else if *p1.Int != 1 {
	t.Fatalf("Unmarshal with %s failed:\nhave %#v,\n want %#v", x, p1.Int, 1)
	}

	p2 := &ParamVal{}
	if err := Unmarshal(x, p2); err != nil {
	t.Fatalf("Unmarshal: %s", err)
	}
	if p2.Int != 1 {
	t.Fatalf("Unmarshal with %s failed:\nhave %#v,\n want %#v", x, p2.Int, 1)
	}

	p3 := &ParamStringPtr{}
	if err := Unmarshal(x, p3); err != nil {
	t.Fatalf("Unmarshal: %s", err)
	}
	if p3.Int == nil {
	t.Fatalf("Unmarshal failed in to *string field")
	} else if *p3.Int != "1" {
	t.Fatalf("Unmarshal with %s failed:\nhave %#v,\n want %#v", x, p3.Int, 1)
	}
	}

	type Tables struct {
	HTable string `xml:"http://www.w3.org/TR/html4/ table"`
	FTable string `xml:"http://www.w3schools.com/furniture table"`
	}

	var tables = []struct {
	xml string
	tab Tables
	ns string
	}{
	{
	xml: `<Tables>` +
	`<table xmlns="http://www.w3.org/TR/html4/">hello</table>` +
	`<table xmlns="http://www.w3schools.com/furniture">world</table>` +
	`</Tables>`,
	tab: Tables{"hello", "world"},
	},
	{
	xml: `<Tables>` +
	`<table xmlns="http://www.w3schools.com/furniture">world</table>` +
	`<table xmlns="http://www.w3.org/TR/html4/">hello</table>` +
	`</Tables>`,
	tab: Tables{"hello", "world"},
	},
	{
	xml: `<Tables xmlns:f="http://www.w3schools.com/furniture" xmlns:h="http://www.w3.org/TR/html4/">` +
	`<f:table>world</f:table>` +
	`<h:table>hello</h:table>` +
	`</Tables>`,
	tab: Tables{"hello", "world"},
	},
	{
	xml: `<Tables>` +
	`<table>bogus</table>` +
	`</Tables>`,
	tab: Tables{},
	},
	{
	xml: `<Tables>` +
	`<table>only</table>` +
	`</Tables>`,
	tab: Tables{HTable: "only"},
	ns: "http://www.w3.org/TR/html4/",
	},
	{
	xml: `<Tables>` +
	`<table>only</table>` +
	`</Tables>`,
	tab: Tables{FTable: "only"},
	ns: "http://www.w3schools.com/furniture",
	},
	{
	xml: `<Tables>` +
	`<table>only</table>` +
	`</Tables>`,
	tab: Tables{},
	ns: "something else entirely",
	},
	}

	func TestUnmarshalNS(t *testing.T) {
	for i, tt := range tables {
	var dst Tables
	var err error
	if tt.ns != "" {
	d := NewDecoder(strings.NewReader(tt.xml))
	d.DefaultSpace = tt.ns
	err = d.Decode(&dst)
	} else {
	err = Unmarshal([]byte(tt.xml), &dst)
	}
	if err != nil {
	t.Errorf("#%d: Unmarshal: %v", i, err)
	continue
	}
	want := tt.tab
	if dst != want {
	t.Errorf("#%d: dst=%+v, want %+v", i, dst, want)
	}
	}
	}

	func TestRoundTrip(t *testing.T) {
	// From issue 7535
	const s = `<ex:element xmlns:ex="http://example.com/schema"></ex:element>`
	in := bytes.NewBufferString(s)
	for i := 0; i < 10; i++ {
	out := &bytes.Buffer{}
	d := NewDecoder(in)
	e := NewEncoder(out)

	for {
	t, err := d.Token()
	if err == io.EOF {
	break
	}
	if err != nil {
	fmt.Println("failed:", err)
	return
	}
	e.EncodeToken(t)
	}
	e.Flush()
	in = out
	}
	if got := in.String(); got != s {
	t.Errorf("have: %q\nwant: %q\n", got, s)
	}
	}

	func TestMarshalNS(t *testing.T) {
	dst := Tables{"hello", "world"}
	data, err := Marshal(&dst)
	if err != nil {
	t.Fatalf("Marshal: %v", err)
	}
	want := `<Tables><table xmlns="http://www.w3.org/TR/html4/">hello</table><table xmlns="http://www.w3schools.com/furniture">world</table></Tables>`
	str := string(data)
	if str != want {
	t.Errorf("have: %q\nwant: %q\n", str, want)
	}
	}

	type TableAttrs struct {
	TAttr TAttr
	}

	type TAttr struct {
	HTable string `xml:"http://www.w3.org/TR/html4/ table,attr"`
	FTable string `xml:"http://www.w3schools.com/furniture table,attr"`
	Lang string `xml:"http://www.w3.org/XML/1998/namespace lang,attr,omitempty"`
	Other1 string `xml:"http://golang.org/xml/ other,attr,omitempty"`
	Other2 string `xml:"http://golang.org/xmlfoo/ other,attr,omitempty"`
	Other3 string `xml:"http://golang.org/json/ other,attr,omitempty"`
	Other4 string `xml:"http://golang.org/2/json/ other,attr,omitempty"`
	}

	var tableAttrs = []struct {
	xml string
	tab TableAttrs
	ns string
	}{
	{
	xml: `<TableAttrs xmlns:f="http://www.w3schools.com/furniture" xmlns:h="http://www.w3.org/TR/html4/"><TAttr ` +
	`h:table="hello" f:table="world" ` +
	`/></TableAttrs>`,
	tab: TableAttrs{TAttr{HTable: "hello", FTable: "world"}},
	},
	{
	xml: `<TableAttrs><TAttr xmlns:f="http://www.w3schools.com/furniture" xmlns:h="http://www.w3.org/TR/html4/" ` +
	`h:table="hello" f:table="world" ` +
	`/></TableAttrs>`,
	tab: TableAttrs{TAttr{HTable: "hello", FTable: "world"}},
	},
	{
	xml: `<TableAttrs><TAttr ` +
	`h:table="hello" f:table="world" xmlns:f="http://www.w3schools.com/furniture" xmlns:h="http://www.w3.org/TR/html4/" ` +
	`/></TableAttrs>`,
	tab: TableAttrs{TAttr{HTable: "hello", FTable: "world"}},
	},
	{
	// Default space does not apply to attribute names.
	xml: `<TableAttrs xmlns="http://www.w3schools.com/furniture" xmlns:h="http://www.w3.org/TR/html4/"><TAttr ` +
	`h:table="hello" table="world" ` +
	`/></TableAttrs>`,
	tab: TableAttrs{TAttr{HTable: "hello", FTable: ""}},
	},
	{
	// Default space does not apply to attribute names.
	xml: `<TableAttrs xmlns:f="http://www.w3schools.com/furniture"><TAttr xmlns="http://www.w3.org/TR/html4/" ` +
	`table="hello" f:table="world" ` +
	`/></TableAttrs>`,
	tab: TableAttrs{TAttr{HTable: "", FTable: "world"}},
	},
	{
	xml: `<TableAttrs><TAttr ` +
	`table="bogus" ` +
	`/></TableAttrs>`,
	tab: TableAttrs{},
	},
	{
	// Default space does not apply to attribute names.
	xml: `<TableAttrs xmlns:h="http://www.w3.org/TR/html4/"><TAttr ` +
	`h:table="hello" table="world" ` +
	`/></TableAttrs>`,
	tab: TableAttrs{TAttr{HTable: "hello", FTable: ""}},
	ns: "http://www.w3schools.com/furniture",
	},
	{
	// Default space does not apply to attribute names.
	xml: `<TableAttrs xmlns:f="http://www.w3schools.com/furniture"><TAttr ` +
	`table="hello" f:table="world" ` +
	`/></TableAttrs>`,
	tab: TableAttrs{TAttr{HTable: "", FTable: "world"}},
	ns: "http://www.w3.org/TR/html4/",
	},
	{
	xml: `<TableAttrs><TAttr ` +
	`table="bogus" ` +
	`/></TableAttrs>`,
	tab: TableAttrs{},
	ns: "something else entirely",
	},
	}

	func TestUnmarshalNSAttr(t *testing.T) {
	for i, tt := range tableAttrs {
	var dst TableAttrs
	var err error
	if tt.ns != "" {
	d := NewDecoder(strings.NewReader(tt.xml))
	d.DefaultSpace = tt.ns
	err = d.Decode(&dst)
	} else {
	err = Unmarshal([]byte(tt.xml), &dst)
	}
	if err != nil {
	t.Errorf("#%d: Unmarshal: %v", i, err)
	continue
	}
	want := tt.tab
	if dst != want {
	t.Errorf("#%d: dst=%+v, want %+v", i, dst, want)
	}
	}
	}

	func TestMarshalNSAttr(t *testing.T) {
	src := TableAttrs{TAttr{"hello", "world", "en_US", "other1", "other2", "other3", "other4"}}
	data, err := Marshal(&src)
	if err != nil {
	t.Fatalf("Marshal: %v", err)
	}
	want := `<TableAttrs><TAttr xmlns:json_1="http://golang.org/2/json/" xmlns:json="http://golang.org/json/" xmlns:_xmlfoo="http://golang.org/xmlfoo/" xmlns:_xml="http://golang.org/xml/" xmlns:furniture="http://www.w3schools.com/furniture" xmlns:html4="http://www.w3.org/TR/html4/" html4:table="hello" furniture:table="world" xml:lang="en_US" _xml:other="other1" _xmlfoo:other="other2" json:other="other3" json_1:other="other4"></TAttr></TableAttrs>`
	str := string(data)
	if str != want {
	t.Errorf("Marshal:\nhave: %#q\nwant: %#q\n", str, want)
	}

	var dst TableAttrs
	if err := Unmarshal(data, &dst); err != nil {
	t.Errorf("Unmarshal: %v", err)
	}

	if dst != src {
	t.Errorf("Unmarshal = %q, want %q", dst, src)
	}
	}

	type MyCharData struct {
	body string
	}

	func (m MyCharData) UnmarshalXML(d Decoder, start StartElement) error {
	for {
	t, err := d.Token()
	if err == io.EOF { // found end of element
	break
	}
	if err != nil {
	return err
	}
	if char, ok := t.(CharData); ok {
	m.body += string(char)
	}
	}
	return nil
	}

	var _ Unmarshaler = (*MyCharData)(nil)

	func (m *MyCharData) UnmarshalXMLAttr(attr Attr) error {
	panic("must not call")
	}

	type MyAttr struct {
	attr string
	}

	func (m *MyAttr) UnmarshalXMLAttr(attr Attr) error {
	m.attr = attr.Value
	return nil
	}

	var _ UnmarshalerAttr = (*MyAttr)(nil)

	type MyStruct struct {
	Data *MyCharData
	Attr *MyAttr `xml:",attr"`

	Data2 MyCharData
	Attr2 MyAttr `xml:",attr"`
	}

	func TestUnmarshaler(t *testing.T) {
	xml := `<?xml version="1.0" encoding="utf-8"?>
	<MyStruct Attr="attr1" Attr2="attr2">
	<Data>hello <!-- comment -->world</Data>
	<Data2>howdy <!-- comment -->world</Data2>
	</MyStruct>
	`

	var m MyStruct
	if err := Unmarshal([]byte(xml), &m); err != nil {
	t.Fatal(err)
	}

	if m.Data == nil \|\| m.Attr == nil \|\| m.Data.body != "hello world" \|\| m.Attr.attr != "attr1" \|\| m.Data2.body != "howdy world" \|\| m.Attr2.attr != "attr2" {
	t.Errorf("m=%#+v\n", m)
	}
	}

	type Pea struct {
	Cotelydon string
	}

	type Pod struct {
	Pea interface{} `xml:"Pea"`
	}

	// https://golang.org/issue/6836
	func TestUnmarshalIntoInterface(t *testing.T) {
	pod := new(Pod)
	pod.Pea = new(Pea)
	xml := `<Pod><Pea><Cotelydon>Green stuff</Cotelydon></Pea></Pod>`
	err := Unmarshal([]byte(xml), pod)
	if err != nil {
	t.Fatalf("failed to unmarshal %q: %v", xml, err)
	}
	pea, ok := pod.Pea.(*Pea)
	if !ok {
	t.Fatalf("unmarshalled into wrong type: have %T want *Pea", pod.Pea)
	}
	have, want := pea.Cotelydon, "Green stuff"
	if have != want {
	t.Errorf("failed to unmarshal into interface, have %q want %q", have, want)
	}
	}