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dom_test.go
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dom_test.go
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package dom_test
import (
"strings"
"testing"
"github.com/go-shiori/dom"
"golang.org/x/net/html"
)
func TestQuerySelectorAll(t *testing.T) {
htmlSource := `<body>
<p></p>
<h1 id="heading"></h1>
<p id="paragraph"></p>
<p class="class-a"></p>
<span class="class-a"></span>
<div class="class-a"></div>
<p class="class-b"></p>
<div class="class-b"></div>
<span class="class-c"></span>
<p class="class-a class-b"></p>
<p class="class-a class-c"></p>
<p class="class-a class-b class-c"></p>
</body>`
doc, err := parseHTMLSource(htmlSource)
if err != nil {
t.Errorf("QuerySelectorAll(), failed to parse: %v", err)
}
tests := map[string]int{
"p": 7,
"h1": 1,
"div": 2,
"span": 2,
"#heading": 1,
"#paragraph": 1,
"#unknown-id": 0,
".class-a": 6,
".class-b": 4,
".class-c": 3,
".class-a.class-b": 2,
".class-a.class-c": 2,
".class-b.class-c": 1,
".class-a.class-b.class-c": 1,
".class-a.class-b.class-d": 0,
".class-a, .class-b": 8,
".class-a, .class-c": 7,
".class-b, .class-c": 6,
".class-a, .class-b, .class-c": 9,
".class-a, .class-b, .class-c, .class-d": 9,
}
for selectors, count := range tests {
t.Run(selectors, func(t *testing.T) {
if got := len(dom.QuerySelectorAll(doc, selectors)); got != count {
t.Errorf("QuerySelectorAll() = %v, want %v", got, count)
}
})
}
}
func TestQuerySelector(t *testing.T) {
htmlSource := `<body>
<p></p>
<h1 id="heading"></h1>
<p id="paragraph"></p>
<p class="class-a"></p>
<span class="class-a"></span>
<div class="class-a"></div>
<p class="class-b"></p>
<div class="class-b"></div>
<span class="class-c"></span>
<p class="class-a class-b"></p>
<p class="class-a class-c"></p>
<p class="class-a class-b class-c"></p>
</body>`
doc, err := parseHTMLSource(htmlSource)
if err != nil {
t.Errorf("QuerySelector(), failed to parse: %v", err)
}
tests := map[string]string{
"p": "p",
"h1": "h1",
"div": "div",
"span": "span",
"#heading": "h1",
"#paragraph": "p",
"#unknown-id": "",
".class-a": "p",
".class-b": "p",
".class-c": "span",
".class-a.class-b": "p",
".class-a.class-c": "p",
".class-b.class-c": "p",
".class-a.class-b.class-c": "p",
".class-a.class-b.class-d": "",
".class-a, .class-b": "p",
".class-a, .class-c": "p",
".class-b, .class-c": "p",
".class-a, .class-b, .class-c": "p",
".class-a, .class-b, .class-c, .class-d": "p",
}
for selectors, tagName := range tests {
t.Run(selectors, func(t *testing.T) {
node := dom.QuerySelector(doc, selectors)
result := ""
if node != nil {
result = dom.TagName(node)
}
if result != tagName {
t.Errorf("QuerySelector() = %v, want %v", result, tagName)
}
})
}
}
func TestGetElementByID(t *testing.T) {
htmlSource := `<div>
<h1 id="heading"></h1>
<p id="paragraph"></p>
<p id="paragraph"></p>
<p></p>
</div>`
doc, err := parseHTMLSource(htmlSource)
if err != nil {
t.Errorf("GetElementByID(), failed to parse: %v", err)
}
tests := map[string]string{
"heading": "h1",
"paragraph": "p",
"unknown-id": "",
}
for id, tagName := range tests {
t.Run(id, func(t *testing.T) {
node := dom.GetElementByID(doc, id)
result := ""
if node != nil {
result = dom.TagName(node)
}
if result != tagName {
t.Errorf("TestGetElementByID() = %v, want %v", result, tagName)
}
})
}
}
func TestGetElementsByClassName(t *testing.T) {
htmlSource := `<div>
<p class="class-a"></p>
<p class="class-a"></p>
<p class="class-a"></p>
<p class="class-b"></p>
<p class="class-b"></p>
<p class="class-c"></p>
<p class="class-a class-b"></p>
<p class="class-a class-c"></p>
<p class="class-a class-b class-c"></p>
</div>`
doc, err := parseHTMLSource(htmlSource)
if err != nil {
t.Errorf("GetElementsByClassName(), failed to parse: %v", err)
}
tests := map[string]int{
"": 0,
"class-a": 6,
"class-b": 4,
"class-c": 3,
"class-a class-b": 2,
"class-a class-c": 2,
"class-b class-c": 1,
"class-a class-b class-c": 1,
}
for className, count := range tests {
t.Run(className, func(t *testing.T) {
if got := len(dom.GetElementsByClassName(doc, className)); got != count {
t.Errorf("GetElementsByClassName() = %v, want %v", got, count)
}
})
}
}
func TestGetElementsByTagName(t *testing.T) {
htmlSource := `<div>
<h1></h1>
<h2></h2><h2></h2>
<h3></h3><h3></h3><h3></h3>
<p></p><p></p><p></p><p></p><p></p>
<div></div><div></div><div></div><div></div><div></div>
<div><p>Hey it's nested</p></div>
<div></div>
<img/><img/><img/><img/><img/><img/><img/><img/>
<img/><img/><img/><img/>
</div>`
doc, err := parseHTMLSource(htmlSource)
if err != nil {
t.Errorf("GetElementsByTagName(), failed to parse: %v", err)
}
tests := map[string]int{
"h1": 1,
"h2": 2,
"h3": 3,
"p": 6,
"div": 7,
"img": 12,
"*": 31,
}
mainDiv := doc.FirstChild
for tagName, count := range tests {
t.Run(tagName, func(t *testing.T) {
if got := len(dom.GetElementsByTagName(mainDiv, tagName)); got != count {
t.Errorf("GetElementsByTagName() = %v, want %v", got, count)
}
})
}
}
func TestCreateElement(t *testing.T) {
tests := []struct {
name string
tagName string
tagCount int
}{{
name: "3 headings1",
tagName: "h1",
tagCount: 3,
}, {
name: "4 headings2",
tagName: "h2",
tagCount: 4,
}, {
name: "5 headings3",
tagName: "h3",
tagCount: 5,
}, {
name: "10 paragraph",
tagName: "p",
tagCount: 10,
}, {
name: "6 div",
tagName: "div",
tagCount: 6,
}, {
name: "8 image",
tagName: "img",
tagCount: 8,
}, {
name: "22 custom tag",
tagName: "custom-tag",
tagCount: 22,
}}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
doc := &html.Node{}
for i := 0; i < tt.tagCount; i++ {
doc.AppendChild(dom.CreateElement(tt.tagName))
}
if tags := dom.GetElementsByTagName(doc, tt.tagName); len(tags) != tt.tagCount {
t.Errorf("CreateElement() = %v, want %v", len(tags), tt.tagCount)
}
})
}
}
func TestCreateTextNode(t *testing.T) {
tests := []string{
"hello world",
"this is awesome",
"all cat is good boy",
"all dog is good boy as well",
}
for _, text := range tests {
t.Run(text, func(t *testing.T) {
node := dom.CreateTextNode(text)
if outerHTML := dom.OuterHTML(node); outerHTML != text {
t.Errorf("CreateTextNode() = %v, want %v", outerHTML, text)
}
})
}
}
func TestGetAttribute(t *testing.T) {
tests := []struct {
name string
htmlSource string
attrName string
want string
}{{
name: "attr id from paragraph",
htmlSource: `<p id="main-paragraph"></p>`,
attrName: "id",
want: "main-paragraph",
}, {
name: "attr class from list",
htmlSource: `<ul class="bullets"></ul>`,
attrName: "class",
want: "bullets",
}, {
name: "attr style from paragraph",
htmlSource: `<div style="display: none"></div>`,
attrName: "style",
want: "display: none",
}, {
name: "attr doesn't exists",
htmlSource: `<p id="main-paragraph"></p>`,
attrName: "class",
want: "",
}, {
name: "node has no attributes",
htmlSource: `<p></p>`,
attrName: "id",
want: "",
}}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
doc, err := parseHTMLSource(tt.htmlSource)
if err != nil {
t.Errorf("GetAttribute(), failed to parse: %v", err)
}
if got := dom.GetAttribute(doc.FirstChild, tt.attrName); got != tt.want {
t.Errorf("GetAttribute() = %v, want %v", got, tt.want)
}
})
}
}
func TestSetAttribute(t *testing.T) {
tests := []struct {
name string
htmlSource string
attrName string
attrValue string
want string
}{{
name: "set id of paragraph",
htmlSource: `<p id="main-paragraph"></p>`,
attrName: "id",
attrValue: "txt-main",
want: `<p id="txt-main"></p>`,
}, {
name: "set id from paragraph with several attrs",
htmlSource: `<p id="main-paragraph" class="title"></p>`,
attrName: "id",
attrValue: "txt-main",
want: `<p id="txt-main" class="title"></p>`,
}, {
name: "set new attr for paragraph",
htmlSource: `<p></p>`,
attrName: "class",
attrValue: "title",
want: `<p class="title"></p>`,
}}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
doc, err := parseHTMLSource(tt.htmlSource)
if err != nil {
t.Errorf("SetAttribute(), failed to parse: %v", err)
}
node := doc.FirstChild
dom.SetAttribute(node, tt.attrName, tt.attrValue)
if outerHTML := dom.OuterHTML(node); outerHTML != tt.want {
t.Errorf("setAttribute() = %v, want %v", outerHTML, tt.want)
}
})
}
}
func TestRemoveAttribute(t *testing.T) {
tests := []struct {
name string
htmlSource string
attrName string
want string
}{{
name: "remove id of paragraph",
htmlSource: `<p id="main-paragraph"></p>`,
attrName: "id",
want: `<p></p>`,
}, {
name: "remove id from paragraph with several attrs",
htmlSource: `<p id="main-paragraph" class="title"></p>`,
attrName: "id",
want: `<p class="title"></p>`,
}, {
name: "remove inexist attr of paragraph",
htmlSource: `<p id="main-paragraph"></p>`,
attrName: "class",
want: `<p id="main-paragraph"></p>`,
}}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
doc, err := parseHTMLSource(tt.htmlSource)
if err != nil {
t.Errorf("RemoveAttribute(), failed to parse: %v", err)
}
node := doc.FirstChild
dom.RemoveAttribute(node, tt.attrName)
if outerHTML := dom.OuterHTML(node); outerHTML != tt.want {
t.Errorf("RemoveAttribute() = %v, want %v", outerHTML, tt.want)
}
})
}
}
func TestHasAttribute(t *testing.T) {
tests := []struct {
name string
htmlSource string
attrName string
want bool
}{{
name: "attribute is exist",
htmlSource: `<p id="main-paragraph"></p>`,
attrName: "id",
want: true,
}, {
name: "attribute is not exist",
htmlSource: `<p id="main-paragraph"></p>`,
attrName: "class",
want: false,
}}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
doc, err := parseHTMLSource(tt.htmlSource)
if err != nil {
t.Errorf("HasAttribute(), failed to parse: %v", err)
}
if got := dom.HasAttribute(doc.FirstChild, tt.attrName); got != tt.want {
t.Errorf("HasAttribute() = %v, want %v", got, tt.want)
}
})
}
}
func TestTextContent(t *testing.T) {
tests := []struct {
name string
htmlSource string
want string
}{{
name: "ordinary text node",
htmlSource: "this is an ordinary text",
want: "this is an ordinary text",
}, {
name: "single empty node element",
htmlSource: "<p></p>",
want: "",
}, {
name: "single node with content",
htmlSource: "<p>Hello all</p>",
want: "Hello all",
}, {
name: "single node with content and unnecessary space",
htmlSource: "<p>Hello all </p>",
want: "Hello all ",
}, {
name: "nested element",
htmlSource: "<div><p>Some nested element</p></div>",
want: "Some nested element",
}, {
name: "nested element with unnecessary space",
htmlSource: "<div><p>Some nested element</p> </div>",
want: "Some nested element ",
}}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
doc, err := parseHTMLSource(tt.htmlSource)
if err != nil {
t.Errorf("TextContent(), failed to parse: %v", err)
}
if got := dom.TextContent(doc.FirstChild); got != tt.want {
t.Errorf("TextContent() = %v, want %v", got, tt.want)
}
})
}
}
func TestOuterHTML(t *testing.T) {
tests := []struct {
name string
htmlSource string
}{{
name: "text node",
htmlSource: "this is an ordinary text",
}, {
name: "single element",
htmlSource: "<h1>Hello</h1>",
}, {
name: "nested elements",
htmlSource: "<div><p>Some nested element</p></div>",
}, {
name: "triple nested elements",
htmlSource: "<div><p>Some <a>nested</a> element</p></div>",
}, {
name: "mixed nested elements",
htmlSource: "<div><p>Some <a>nested</a> element</p><p>and more</p></div>",
}}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
doc, err := parseHTMLSource(tt.htmlSource)
if err != nil {
t.Errorf("dom.OuterHTML(), failed to parse: %v", err)
}
if got := dom.OuterHTML(doc.FirstChild); got != tt.htmlSource {
t.Errorf("dom.OuterHTML() = %v, want %v", got, tt.htmlSource)
}
})
}
}
func TestInnerHTML(t *testing.T) {
tests := []struct {
name string
htmlSource string
want string
}{{
name: "text node",
htmlSource: "this is an ordinary text",
want: "",
}, {
name: "single element",
htmlSource: "<h1>Hello</h1>",
want: "Hello",
}, {
name: "nested elements",
htmlSource: "<div><p>Some nested element</p></div>",
want: "<p>Some nested element</p>",
}, {
name: "mixed text and element node",
htmlSource: "<div><p>Some element</p>with text</div>",
want: "<p>Some element</p>with text",
}, {
name: "triple nested elements",
htmlSource: "<div><p>Some <a>nested</a> element</p></div>",
want: "<p>Some <a>nested</a> element</p>",
}, {
name: "mixed nested elements",
htmlSource: "<div><p>Some <a>nested</a> element</p><p>and more</p></div>",
want: "<p>Some <a>nested</a> element</p><p>and more</p>",
}}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
doc, err := parseHTMLSource(tt.htmlSource)
if err != nil {
t.Errorf("InnerHTML(), failed to parse: %v", err)
}
if got := dom.InnerHTML(doc.FirstChild); got != tt.want {
t.Errorf("InnerHTML() = %v, want %v", got, tt.want)
}
})
}
}
func TestId(t *testing.T) {
tests := []struct {
name string
htmlSource string
want string
}{{
name: "id exists",
htmlSource: `<p id="main-paragraph"></p>`,
want: "main-paragraph",
}, {
name: "id doesn't exist",
htmlSource: `<p></p>`,
want: "",
}}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
doc, err := parseHTMLSource(tt.htmlSource)
if err != nil {
t.Errorf("ID(), failed to parse: %v", err)
}
if got := dom.ID(doc.FirstChild); got != tt.want {
t.Errorf("ID() = %v, want %v", got, tt.want)
}
})
}
}
func TestClassName(t *testing.T) {
tests := []struct {
name string
htmlSource string
want string
}{{
name: "class doesn't exist",
htmlSource: `<p></p>`,
want: "",
}, {
name: "class exist",
htmlSource: `<p class="title"></p>`,
want: "title",
}, {
name: "multiple class",
htmlSource: `<p class="title heading"></p>`,
want: "title heading",
}, {
name: "multiple class with unnecessary space",
htmlSource: `<p class=" title heading "></p>`,
want: "title heading",
}}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
doc, err := parseHTMLSource(tt.htmlSource)
if err != nil {
t.Errorf("ClassName(), failed to parse: %v", err)
}
if got := dom.ClassName(doc.FirstChild); got != tt.want {
t.Errorf("ClassName() = %v, want %v", got, tt.want)
}
})
}
}
func TestChildren(t *testing.T) {
tests := []struct {
name string
htmlSource string
want []string
}{{
name: "has no children",
htmlSource: "<div></div>",
want: []string{},
}, {
name: "has one children",
htmlSource: "<div><p>Hello</p></div>",
want: []string{"<p>Hello</p>"},
}, {
name: "has many children",
htmlSource: "<div><p>Hello</p><p>I'm</p><p>Happy</p></div>",
want: []string{"<p>Hello</p>", "<p>I'm</p>", "<p>Happy</p>"},
}, {
name: "has nested children",
htmlSource: "<div><p>Hello I'm <span>Happy</span></p></div>",
want: []string{"<p>Hello I'm <span>Happy</span></p>"},
}, {
name: "mixed text and element node",
htmlSource: "<div><p>Hello I'm</p>happy</div>",
want: []string{"<p>Hello I'm</p>"},
}}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
doc, err := parseHTMLSource(tt.htmlSource)
if err != nil {
t.Errorf("Children(), failed to parse: %v", err)
}
div := doc.FirstChild
nodes := dom.Children(div)
if len(nodes) != len(tt.want) {
t.Errorf("Children() count = %v, want = %v", len(nodes), len(tt.want))
}
for i, child := range nodes {
wantHTML := tt.want[i]
childHTML := dom.OuterHTML(child)
if childHTML != wantHTML {
t.Errorf("Children() = %v, want = %v", childHTML, wantHTML)
}
}
})
}
}
func TestChildNodes(t *testing.T) {
tests := []struct {
name string
htmlSource string
want []string
}{{
name: "has no children",
htmlSource: "<div></div>",
want: []string{},
}, {
name: "has one children",
htmlSource: "<div><p>Hello</p></div>",
want: []string{"<p>Hello</p>"},
}, {
name: "has many children",
htmlSource: "<div><p>Hello</p><p>I'm</p><p>Happy</p></div>",
want: []string{"<p>Hello</p>", "<p>I'm</p>", "<p>Happy</p>"},
}, {
name: "has nested children",
htmlSource: "<div><p>Hello I'm <span>Happy</span></p></div>",
want: []string{"<p>Hello I'm <span>Happy</span></p>"},
}, {
name: "mixed text and element node",
htmlSource: "<div><p>Hello I'm</p>happy</div>",
want: []string{"<p>Hello I'm</p>", "happy"},
}}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
doc, err := parseHTMLSource(tt.htmlSource)
if err != nil {
t.Errorf("ChildNodes(), failed to parse: %v", err)
}
div := doc.FirstChild
nodes := dom.ChildNodes(div)
if len(nodes) != len(tt.want) {
t.Errorf("ChildNodes() count = %v, want = %v", len(nodes), len(tt.want))
}
for i, child := range nodes {
wantHTML := tt.want[i]
childHTML := dom.OuterHTML(child)
if child.Type == html.TextNode {
childHTML = dom.TextContent(child)
}
if childHTML != wantHTML {
t.Errorf("ChildNodes() = %v, want = %v", childHTML, wantHTML)
}
}
})
}
}
func TestFirstElementChild(t *testing.T) {
tests := []struct {
name string
htmlSource string
want string
}{{
name: "has no children",
htmlSource: "<div></div>",
want: "",
}, {
name: "has one children",
htmlSource: "<div><p>Hey</p></div>",
want: "<p>Hey</p>",
}, {
name: "has several children",
htmlSource: "<div><p>Hey</p><b>bro</b></div>",
want: "<p>Hey</p>",
}}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
doc, err := parseHTMLSource(tt.htmlSource)
if err != nil {
t.Errorf("FirstElementChild(), failed to parse: %v", err)
}
div := doc.FirstChild
firstChild := dom.FirstElementChild(div)
if got := dom.OuterHTML(firstChild); got != tt.want {
t.Errorf("FirstElementChild() = %v, want %v", got, tt.want)
}
})
}
}
func TestPreviousElementSibling(t *testing.T) {
tests := []struct {
name string
htmlSource string
want string
}{{
name: "has no sibling",
htmlSource: "<div></div>",
want: "",
}, {
name: "has directly element sibling",
htmlSource: "<p>Hey</p><div></div>",
want: "<p>Hey</p>",
}, {
name: "has no element sibling",
htmlSource: "I'm your sibling, you know<div></div>",
want: "",
}, {
name: "has distant element sibling",
htmlSource: "<p>This is the one you want</p> not this one <div></div>",
want: "<p>This is the one you want</p>",
}}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
doc, err := parseHTMLSource(tt.htmlSource)
if err != nil {
t.Errorf("PreviousElementSibling(), failed to parse: %v", err)
}
div := dom.GetElementsByTagName(doc, "div")[0]
prevSibling := dom.PreviousElementSibling(div)
if got := dom.OuterHTML(prevSibling); got != tt.want {
t.Errorf("PreviousElementSibling() = %v, want %v", got, tt.want)
}
})
}
}
func TestNextElementSibling(t *testing.T) {
tests := []struct {
name string
htmlSource string
want string
}{{
name: "has no sibling",
htmlSource: "<div></div>",
want: "",
}, {
name: "has directly element sibling",
htmlSource: "<div></div><p>Hey</p>",
want: "<p>Hey</p>",
}, {
name: "has no element sibling",
htmlSource: "<div></div>I'm your sibling, you know",
want: "",
}, {
name: "has distant element sibling",
htmlSource: "<div></div>I'm your sibling as well <p>only me matter</p>",
want: "<p>only me matter</p>",
}}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
doc, err := parseHTMLSource(tt.htmlSource)
if err != nil {
t.Errorf("NextElementSibling(), failed to parse: %v", err)
}
div := dom.GetElementsByTagName(doc, "div")[0]
nextSibling := dom.NextElementSibling(div)
if got := dom.OuterHTML(nextSibling); got != tt.want {
t.Errorf("NextElementSibling() = %v, want %v", got, tt.want)
}
})
}
}
func TestAppendChild(t *testing.T) {
// Child is from inside document
t.Run("child from existing node", func(t *testing.T) {
htmlSource := `<div><p>Lonely word</p><span>new friend</span></div>`
want := `<div><p>Lonely word<span>new friend</span></p></div>`
doc, err := parseHTMLSource(htmlSource)
if err != nil {
t.Errorf("AppendChild(), failed to parse: %v", err)
}
div := doc.FirstChild
p := dom.GetElementsByTagName(div, "p")[0]
span := dom.GetElementsByTagName(div, "span")[0]
dom.AppendChild(p, span)
if got := dom.OuterHTML(div); got != want {
t.Errorf("AppendChild() = %v, want %v", got, want)
}
})
// Child is new element
t.Run("child is new element", func(t *testing.T) {
htmlSource := `<div><p>Lonely word</p><span>new friend</span></div>`
want := `<div><p>Lonely word<span></span></p><span>new friend</span></div>`
doc, err := parseHTMLSource(htmlSource)
if err != nil {
t.Errorf("AppendChild(), failed to parse: %v", err)
}
div := doc.FirstChild
p := dom.GetElementsByTagName(div, "p")[0]
newChild := dom.CreateElement("span")
dom.AppendChild(p, newChild)
if got := dom.OuterHTML(div); got != want {
t.Errorf("AppendChild() = %v, want %v", got, want)
}
})
// Parent is void
t.Run("parent is void", func(t *testing.T) {
br := dom.CreateElement("br")
span := dom.CreateElement("span")
dom.AppendChild(br, span)
want := "<br/>"
if got := dom.OuterHTML(br); got != want {
t.Errorf("AppendChild() = %v, want %v", got, want)
}
})
}
func TestPrependChild(t *testing.T) {
// Child is from inside document
t.Run("child from existing node", func(t *testing.T) {
htmlSource := `<div><p>Lonely word</p><span>new friend</span></div>`
want := `<div><p><span>new friend</span>Lonely word</p></div>`
doc, err := parseHTMLSource(htmlSource)
if err != nil {
t.Errorf("PrependChild(), failed to parse: %v", err)
}
div := doc.FirstChild
p := dom.GetElementsByTagName(div, "p")[0]
span := dom.GetElementsByTagName(div, "span")[0]
dom.PrependChild(p, span)
if got := dom.OuterHTML(div); got != want {
t.Errorf("PrependChild() = %v, want %v", got, want)
}
})
// Child is new element
t.Run("child is new element", func(t *testing.T) {
htmlSource := `<div><p>Lonely word</p><span>new friend</span></div>`
want := `<div><p><span></span>Lonely word</p><span>new friend</span></div>`
doc, err := parseHTMLSource(htmlSource)
if err != nil {
t.Errorf("PrependChild(), failed to parse: %v", err)
}
div := doc.FirstChild
p := dom.GetElementsByTagName(div, "p")[0]
newChild := dom.CreateElement("span")
dom.PrependChild(p, newChild)
if got := dom.OuterHTML(div); got != want {
t.Errorf("PrependChild() = %v, want %v", got, want)
}
})
// Parent is void
t.Run("parent is void", func(t *testing.T) {
br := dom.CreateElement("br")
span := dom.CreateElement("span")
dom.PrependChild(br, span)
want := "<br/>"
if got := dom.OuterHTML(br); got != want {
t.Errorf("PrependChild() = %v, want %v", got, want)
}
})
}
func TestReplaceChild(t *testing.T) {
// new child is from existing element
t.Run("new child from existing element", func(t *testing.T) {
htmlSource := `<div><p>Lonely word</p><span>new friend</span></div>`
want := `<div><span>new friend</span></div>`
doc, err := parseHTMLSource(htmlSource)
if err != nil {
t.Errorf("ReplaceNode(), failed to parse: %v", err)
}
div := doc.FirstChild
p := dom.GetElementsByTagName(div, "p")[0]
span := dom.GetElementsByTagName(div, "span")[0]
dom.ReplaceChild(div, span, p)
if got := dom.OuterHTML(div); got != want {
t.Errorf("ReplaceNode() = %v, want %v", got, want)
}
})